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1
Li, Huiyu, Xiaomei Chen, Wei Xiong, Fang Liu i Shiang Huang. "The Regulation of Zinc Finger Proteins by Mirnas Enriched in ALL-Microvesicles". Blood 120, nr 21 (16.11.2012): 1448. http://dx.doi.org/10.1182/blood.v120.21.1448.1448.
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Abstract Abstract 1448 Microvesicles (MVs) are submicrometric membrane fragments and they can “hijack” membrane components and engulf cytoplasmic contents from their cellular origin. MVs are enriched in various bioactive molecules of their parental cells, such as proteins, DNA, mRNA and miRNAs. Microvesicles (MVs) released by leukemia cells constitute an important part of the leukemia microenvironment. As a cell-to-cell communication tool, MVs transfer microRNA (miRNA) between cells. MVs miRNAs may also provide an insight in the role of miRNAs playing in the underlying of pathophysiologic processes of various leukemia. We determined the miRNA expression profiles of ALL-derived MVs using Agilent miRNA microarray analysis. The five miRNAs obtained by microarray profiling were validated using real-time PCR. The putative target genes were predicted by bioformation software. We identified 182 and 166 dysregulated miRNAs in MVs derived from Nalm 6 cells and from Jurkat cells, respectively. Both up regulated (123/182 in Nalm 6-MVs and 114/166 in Jurkat- MVs) and down regulated (59/182 in Nalm 6-MVs and 52/166 in Jurkat- MVs) expressions were observed compared with MVs from normal peripheral blood the MVs normal control. When we analyzed those miRNA with bioinformatic tools (TargetScan), we found an interesting phenomenon that presence of 111 zinc fingers genes were regulated by 52 miRNAs, indicating that the ALL-microvesicles were enriched with miRNAs regulating zinc finger proteins. They encompassed zinc fingers and homeoboxes 2, zinc finger, ZZ-type containing 3, zinc finger, SWIM-type containing 1, zinc finger, RAN-binding domain containing 3, zinc finger, NFX1-type containing 1, zinc finger, MYM-type 4, zinc finger, FYVE domain containing 1 and their 5 subtypes; zinc finger, DHHC-type containing16, and other subtypes; zinc finger, CCHC domain containing 14 and 7A, zinc finger, BED-type containing 4; zinc finger protein, X-linked; zinc finger protein, multitype 2; zinc finger protein 81, and their 55 subtypes; zinc finger and SCAN domain containing 18, zinc finger and BTB domain containing 9. ALL-microvesicles were enriched with expression changes of distinct sets of miRNAs regulating zinc finger proteins. This provides clues that genes commonly function together. It is worth noting that 52 miRNA regulating above zinc finger protein genes were up-expressed, suggeting that miRNA regulating zinc fingers were active in ALL-MVs. Zinc finger proteins are important transcriptions in eukaryotes and play roles in regulating gene. Some members of the Zinc finger family have close relationaship with tumour. Zinc finger X-chromosomal protein (Zfx) is a protein that in humans is encoded by the ZFX gene. The level of Zfx expression correlates with aggressiveness and severity in many cancer types, including prostate cancer, breast cancer, gastric tumoural tissues, and leukemia. [1,2]. Zinc finger and homeoboxes 2 (ZHX2) was target gene of miRNA-1260. The role of miRNA are negatively regulated host gene expressions. ZHX2 inhibits HCC cell proliferation by preventing expression of Cyclins A and E, and reduces growth of xenograft tumors. Loss of nuclear ZHX2 might be an early step in the development of HCC[3]. In our study, the miRNA-1260 were 9 fold higher in ALL MVs. In leukeima microenvironment, ALL-MVs may transfer aberantly expressed miRNAs to their target cell lead to abnormally regulated the zinc finger proteins that may play roles in ALL. In this study, we demonstrated that ALL-microvesicles were enriched with expression changes of distinct sets of miRNAs regulating zinc finger proteins. Futhermore, Zinc fingers were active in ALL-MVs and commonly function together. Disclosures: No relevant conflicts of interest to declare.
2
Keller, A. D., i T. Maniatis. "Only two of the five zinc fingers of the eukaryotic transcriptional repressor PRDI-BF1 are required for sequence-specific DNA binding". Molecular and Cellular Biology 12, nr 5 (maj 1992): 1940–49. http://dx.doi.org/10.1128/mcb.12.5.1940-1949.1992.
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The eukaryotic transcriptional repressor PRDI-BF1 contains five zinc fingers of the C2H2 type, and the protein binds specifically to PRDI, a 14-bp regulatory element of the beta interferon gene promoter. We have investigated the amino acid sequence requirements for specific binding to PRDI and found that the five zinc fingers and a short stretch of amino acids N terminal to the first finger are necessary and sufficient for PRDI-specific binding. The contribution of individual zinc fingers to DNA binding was investigated by inserting them in various combinations into another zinc finger-containing DNA-binding protein whose own fingers had been removed. We found that insertion of PRDI-BF1 zinc fingers 1 and 2 confer PRDI-binding activity on the recipient protein. In contrast, the insertion of PRDI-BF1 zinc fingers 2 through 5, the insertion of zinc finger 1 or 2 alone, and the insertion of zinc fingers 1 and 2 in reverse order did not confer PRDI-binding activity. We conclude that the first two PRDI-BF1 zinc fingers together are sufficient for the sequence-specific recognition of PRDI.
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Keller, A. D., i T. Maniatis. "Only two of the five zinc fingers of the eukaryotic transcriptional repressor PRDI-BF1 are required for sequence-specific DNA binding." Molecular and Cellular Biology 12, nr 5 (maj 1992): 1940–49. http://dx.doi.org/10.1128/mcb.12.5.1940.
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The eukaryotic transcriptional repressor PRDI-BF1 contains five zinc fingers of the C2H2 type, and the protein binds specifically to PRDI, a 14-bp regulatory element of the beta interferon gene promoter. We have investigated the amino acid sequence requirements for specific binding to PRDI and found that the five zinc fingers and a short stretch of amino acids N terminal to the first finger are necessary and sufficient for PRDI-specific binding. The contribution of individual zinc fingers to DNA binding was investigated by inserting them in various combinations into another zinc finger-containing DNA-binding protein whose own fingers had been removed. We found that insertion of PRDI-BF1 zinc fingers 1 and 2 confer PRDI-binding activity on the recipient protein. In contrast, the insertion of PRDI-BF1 zinc fingers 2 through 5, the insertion of zinc finger 1 or 2 alone, and the insertion of zinc fingers 1 and 2 in reverse order did not confer PRDI-binding activity. We conclude that the first two PRDI-BF1 zinc fingers together are sufficient for the sequence-specific recognition of PRDI.
4
Witte, M. M., i R. C. Dickson. "The C6 zinc finger and adjacent amino acids determine DNA-binding specificity and affinity in the yeast activator proteins LAC9 and PPR1". Molecular and Cellular Biology 10, nr 10 (październik 1990): 5128–37. http://dx.doi.org/10.1128/mcb.10.10.5128-5137.1990.
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LAC9 is a DNA-binding protein that regulates transcription of the lactose-galactose regulon in Kluyveromyces lactis. The DNA-binding domain is composed of a zinc finger and nearby amino acids (M. M. Witte and R. C. Dickson, Mol. Cell. Biol. 8:3726-3733, 1988). The single zinc finger appears to be structurally related to the zinc finger of many other fungal transcription activator proteins that contain positively charged residues and six conserved cysteines with the general form Cys-Xaa2-Cys-Xaa6-Cys-Xaa6-9-Cys-Xaa2-Cys-Xaa 6-Cys, where Xaan indicates a stretch of the indicated number of any amino acids (R. M. Evans and S. M. Hollenberg, Cell 52:1-3, 1988). The function(s) of the zinc finger and other amino acids in DNA-binding remains unclear. To determine which portion of the LAC9 DNA-binding domain mediates sequence recognition, we replaced the C6 zinc finger, amino acids adjacent to the carboxyl side of the zinc finger, or both with the analogous region from the Saccharomyces cerevisiae PPR1 or LEU3 protein. A chimeric LAC9 protein, LAC9(PPR1 34-61), carrying only the PPR1 zinc finger, retained the DNA-binding specificity of LAC9. However, LAC9(PPR1 34-75), carrying the PPR1 zinc finger and 14 amino acids on the carboxyl side of the zinc finger, gained the DNA-binding specificity of PPR1, indicating that these 14 amino acids are necessary for specific DNA binding. Our data show that C6 fingers can substitute for each other and allow DNA binding, but binding affinity is reduced. Thus, in a qualitative sense C6 fingers perform a similar function(s). However, the high-affinity binding required by natural C6 finger proteins demands a unique C6 finger with a specific amino acid sequence. This requirement may reflect conformational constraints, including interactions between the C6 finger and the carboxyl-adjacent amino acids; alternatively or in addition, it may indicate that unique, nonconserved amino acid residues in zinc fingers make sequence-specifying or stabilizing contacts with DNA.
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Witte, M. M., i R. C. Dickson. "The C6 zinc finger and adjacent amino acids determine DNA-binding specificity and affinity in the yeast activator proteins LAC9 and PPR1." Molecular and Cellular Biology 10, nr 10 (październik 1990): 5128–37. http://dx.doi.org/10.1128/mcb.10.10.5128.
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LAC9 is a DNA-binding protein that regulates transcription of the lactose-galactose regulon in Kluyveromyces lactis. The DNA-binding domain is composed of a zinc finger and nearby amino acids (M. M. Witte and R. C. Dickson, Mol. Cell. Biol. 8:3726-3733, 1988). The single zinc finger appears to be structurally related to the zinc finger of many other fungal transcription activator proteins that contain positively charged residues and six conserved cysteines with the general form Cys-Xaa2-Cys-Xaa6-Cys-Xaa6-9-Cys-Xaa2-Cys-Xaa 6-Cys, where Xaan indicates a stretch of the indicated number of any amino acids (R. M. Evans and S. M. Hollenberg, Cell 52:1-3, 1988). The function(s) of the zinc finger and other amino acids in DNA-binding remains unclear. To determine which portion of the LAC9 DNA-binding domain mediates sequence recognition, we replaced the C6 zinc finger, amino acids adjacent to the carboxyl side of the zinc finger, or both with the analogous region from the Saccharomyces cerevisiae PPR1 or LEU3 protein. A chimeric LAC9 protein, LAC9(PPR1 34-61), carrying only the PPR1 zinc finger, retained the DNA-binding specificity of LAC9. However, LAC9(PPR1 34-75), carrying the PPR1 zinc finger and 14 amino acids on the carboxyl side of the zinc finger, gained the DNA-binding specificity of PPR1, indicating that these 14 amino acids are necessary for specific DNA binding. Our data show that C6 fingers can substitute for each other and allow DNA binding, but binding affinity is reduced. Thus, in a qualitative sense C6 fingers perform a similar function(s). However, the high-affinity binding required by natural C6 finger proteins demands a unique C6 finger with a specific amino acid sequence. This requirement may reflect conformational constraints, including interactions between the C6 finger and the carboxyl-adjacent amino acids; alternatively or in addition, it may indicate that unique, nonconserved amino acid residues in zinc fingers make sequence-specifying or stabilizing contacts with DNA.
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Sievers, Quinlan L., Georg Petzold, Richard D. Bunker, Aline Renneville, Mikołaj Słabicki, Brian J. Liddicoat, Wassim Abdulrahman, Tarjei Mikkelsen, Benjamin L. Ebert i Nicolas H. Thomä. "Defining the human C2H2 zinc finger degrome targeted by thalidomide analogs through CRBN". Science 362, nr 6414 (1.11.2018): eaat0572. http://dx.doi.org/10.1126/science.aat0572.
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The small molecules thalidomide, lenalidomide, and pomalidomide induce the ubiquitination and proteasomal degradation of the transcription factors Ikaros (IKZF1) and Aiolos (IKZF3) by recruiting a Cys2-His2 (C2H2) zinc finger domain to Cereblon (CRBN), the substrate receptor of the CRL4CRBN E3 ubiquitin ligase. We screened the human C2H2 zinc finger proteome for degradation in the presence of thalidomide analogs, identifying 11 zinc finger degrons. Structural and functional characterization of the C2H2 zinc finger degrons demonstrates how diverse zinc finger domains bind the permissive drug-CRBN interface. Computational zinc finger docking and biochemical analysis predict that more than 150 zinc fingers bind the drug-CRBN complex in vitro, and we show that selective zinc finger degradation can be achieved through compound modifications. Our results provide a rationale for therapeutically targeting transcription factors that were previously considered undruggable.
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GREEN, Andrew, i Bibudhendra SARKAR. "Alteration of zif268 zinc-finger motifs gives rise to non-native zinc-co-ordination sites but preserves wild-type DNA recognition". Biochemical Journal 333, nr 1 (1.07.1998): 85–90. http://dx.doi.org/10.1042/bj3330085.
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Zinc fingers are among the major structural motifs found in proteins that are involved in eukaryotic gene regulation. Many of these zinc-finger domains are involved in DNA binding. This study investigated whether the zinc-co-ordinating (Cys)2(His)2 motif found in the three zinc fingers of zif268 could be replaced by a (Cys)4 motif while still preserving DNA recognition. (Cys)2(His)2-to-(Cys)4 mutations were generated in each of the three zinc fingers of zif268 individually, as well as in fingers 1 and 3, and fingers 2 and 3 together. Whereas finger 1 and finger 3 tolerate the switch, such an alteration in finger 2 renders the polypeptide incapable of DNA recognition. The protein–DNA interaction was examined in greater detail by using a methylation-interference assay. The mutant polypeptides containing the (Cys)4 motif in fingers 1 or 3 recognize DNA in a manner identical to the wild-type protein, suggesting that the (Cys)4 motif appears to give rise to a properly folded finger. Additional results indicate that a zif268 variant containing a (Cys)2(His)(Ala) arrangement in finger 1 is also capable of DNA recognition in a manner identical to the wild-type polypeptide. This appears to be the first time that such alterations, in the context of an intact DNA-binding domain, have still allowed for specific DNA recognition. Taken together, the work presented here enhances our understanding of the relationship between metal ligation and DNA-binding by zinc fingers.
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Rollins, M. B., S. Del Rio, A. L. Galey, D. R. Setzer i M. T. Andrews. "Role of TFIIIA zinc fingers in vivo: analysis of single-finger function in developing Xenopus embryos". Molecular and Cellular Biology 13, nr 8 (sierpień 1993): 4776–83. http://dx.doi.org/10.1128/mcb.13.8.4776-4783.1993.
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The Xenopus 5S RNA gene-specific transcription factor IIIA (TFIIIA) has nine consecutive Cys2His2 zinc finger motifs. Studies were conducted in vivo to determine the contribution of each of the nine zinc fingers to the activity of TFIIIA in living cells. Nine separate TFIIIA mutants were expressed in Xenopus embryos following microinjection of their respective in vitro-derived mRNAs. Each mutant contained a single histidine-to-asparagine substitution in the third zinc ligand position of an individual zinc finger. These mutations result in structural disruption of the mutated finger with little or no effect on the other fingers. The activity of mutant proteins in vivo was assessed by measuring transcriptional activation of the endogenous 5S RNA genes. Mutants containing a substitution in zinc finger 1, 2, or 3 activate 5S RNA genes at a level which is reduced relative to that in embryos injected with the message for wild-type TFIIIA. Proteins with a histidine-to-asparagine substitution in zinc finger 5 or 7 activate 5S RNA genes at a level that is roughly equivalent to that of the wild-type protein. Zinc fingers 8 and 9 appear to be critical for the normal function of TFIIIA, since mutations in these fingers result in little or no activation of the endogenous 5S RNA genes. Surprisingly, proteins with a mutation in zinc finger 4 or 6 stimulate 5S RNA transcription at a level that is significantly higher than that mediated by similar concentrations of wild-type TFIIIA. Differences in the amount of newly synthesized 5S RNA in embryos containing the various mutant forms of TFIIIA result from differences in the relative number and/or activity of transcription complexes assembled on the endogenous 5S RNA genes and, in the case of the finger 4 and finger 6 mutants, result from increased transcriptional activation of the normally inactive oocyte-type 5S RNA genes. The remarkably high activity of the finger 6 mutant can be reproduced in vitro when transcription is carried out in the presence of 5S RNA. Disruption of zinc finger 6 results in a form of TFIIIA that exhibits reduced susceptibility to feedback inhibition by 5S RNA and therefore increases the availability of the transcription factor for transcription complex formation.
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Rollins, M. B., S. Del Rio, A. L. Galey, D. R. Setzer i M. T. Andrews. "Role of TFIIIA zinc fingers in vivo: analysis of single-finger function in developing Xenopus embryos." Molecular and Cellular Biology 13, nr 8 (sierpień 1993): 4776–83. http://dx.doi.org/10.1128/mcb.13.8.4776.
Pełny tekst źródłaStreszczenie:
The Xenopus 5S RNA gene-specific transcription factor IIIA (TFIIIA) has nine consecutive Cys2His2 zinc finger motifs. Studies were conducted in vivo to determine the contribution of each of the nine zinc fingers to the activity of TFIIIA in living cells. Nine separate TFIIIA mutants were expressed in Xenopus embryos following microinjection of their respective in vitro-derived mRNAs. Each mutant contained a single histidine-to-asparagine substitution in the third zinc ligand position of an individual zinc finger. These mutations result in structural disruption of the mutated finger with little or no effect on the other fingers. The activity of mutant proteins in vivo was assessed by measuring transcriptional activation of the endogenous 5S RNA genes. Mutants containing a substitution in zinc finger 1, 2, or 3 activate 5S RNA genes at a level which is reduced relative to that in embryos injected with the message for wild-type TFIIIA. Proteins with a histidine-to-asparagine substitution in zinc finger 5 or 7 activate 5S RNA genes at a level that is roughly equivalent to that of the wild-type protein. Zinc fingers 8 and 9 appear to be critical for the normal function of TFIIIA, since mutations in these fingers result in little or no activation of the endogenous 5S RNA genes. Surprisingly, proteins with a mutation in zinc finger 4 or 6 stimulate 5S RNA transcription at a level that is significantly higher than that mediated by similar concentrations of wild-type TFIIIA. Differences in the amount of newly synthesized 5S RNA in embryos containing the various mutant forms of TFIIIA result from differences in the relative number and/or activity of transcription complexes assembled on the endogenous 5S RNA genes and, in the case of the finger 4 and finger 6 mutants, result from increased transcriptional activation of the normally inactive oocyte-type 5S RNA genes. The remarkably high activity of the finger 6 mutant can be reproduced in vitro when transcription is carried out in the presence of 5S RNA. Disruption of zinc finger 6 results in a form of TFIIIA that exhibits reduced susceptibility to feedback inhibition by 5S RNA and therefore increases the availability of the transcription factor for transcription complex formation.
10
Fu, Fengli, i Daniel F. Voytas. "Zinc Finger Database (ZiFDB) v2.0: a comprehensive database of C2H2 zinc fingers and engineered zinc finger arrays". Nucleic Acids Research 41, nr D1 (29.11.2012): D452—D455. http://dx.doi.org/10.1093/nar/gks1167.
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Fu, F., J. D. Sander, M. Maeder, S. Thibodeau-Beganny, J. K. Joung, D. Dobbs, L. Miller i D. F. Voytas. "Zinc Finger Database (ZiFDB): a repository for information on C2H2 zinc fingers and engineered zinc-finger arrays". Nucleic Acids Research 37, Database (1.01.2009): D279—D283. http://dx.doi.org/10.1093/nar/gkn606.
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Gebelein, Brian, i Raul Urrutia. "Sequence-Specific Transcriptional Repression by KS1, a Multiple-Zinc-Finger–Krüppel-Associated Box Protein". Molecular and Cellular Biology 21, nr 3 (1.02.2001): 928–39. http://dx.doi.org/10.1128/mcb.21.3.928-939.2001.
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ABSTRACT The vertebrate genome contains a large number of Krüppel-associated box–zinc finger genes that encode 10 or more C2-H2 zinc finger motifs. Members of this gene family have been proposed to function as transcription factors by binding DNA through their zinc finger region and repressing gene expression via the KRAB domain. To date, however, no Krüppel-associated box–zinc finger protein (KRAB-ZFP) and few proteins with 10 or more zinc finger motifs have been shown to bind DNA in a sequence-specific manner. Our laboratory has recently identified KS1, a member of the KRAB-ZFP family that contains 10 different C2-H2 zinc finger motifs, 9 clustered at the C terminus with an additional zinc finger separated by a short linker region. In this study, we used a random oligonucleotide binding assay to identify a 27-bp KS1 binding element (KBE). Reporter assays demonstrate that KS1 represses the expression of promoters containing this DNA sequence. Deletion and site-directed mutagenesis reveal that KS1 requires nine C-terminal zinc fingers and the KRAB domain for transcriptional repression through the KBE site, whereas the isolated zinc finger and linker region are dispensable for this function. Additional biochemical assays demonstrate that the KS1 KRAB domain interacts with the KAP-1 corepressor, and mutations that abolish this interaction alleviate KS1-mediated transcriptional repression. Thus, this study provides the first direct evidence that a KRAB-ZFP binds DNA to regulate gene expression and provides insight into the mechanisms used by multiple-zinc-finger proteins to recognize DNA sequences.
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Han, Guoliang, Ziqi Qiao, Yuxia Li, Chengfeng Wang i Baoshan Wang. "The Roles of CCCH Zinc-Finger Proteins in Plant Abiotic Stress Tolerance". International Journal of Molecular Sciences 22, nr 15 (3.08.2021): 8327. http://dx.doi.org/10.3390/ijms22158327.
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Zinc-finger proteins, a superfamily of proteins with a typical structural domain that coordinates a zinc ion and binds nucleic acids, participate in the regulation of growth, development, and stress adaptation in plants. Most zinc fingers are C2H2-type or CCCC-type, named after the configuration of cysteine (C) and histidine (H); the less-common CCCH zinc-finger proteins are important in the regulation of plant stress responses. In this review, we introduce the domain structures, classification, and subcellular localization of CCCH zinc-finger proteins in plants and discuss their functions in transcriptional and post-transcriptional regulation via interactions with DNA, RNA, and other proteins. We describe the functions of CCCH zinc-finger proteins in plant development and tolerance to abiotic stresses such as salt, drought, flooding, cold temperatures and oxidative stress. Finally, we summarize the signal transduction pathways and regulatory networks of CCCH zinc-finger proteins in their responses to abiotic stress. CCCH zinc-finger proteins regulate the adaptation of plants to abiotic stress in various ways, but the specific molecular mechanisms need to be further explored, along with other mechanisms such as cytoplasm-to-nucleus shuttling and post-transcriptional regulation. Unraveling the molecular mechanisms by which CCCH zinc-finger proteins improve stress tolerance will facilitate the breeding and genetic engineering of crops with improved traits.
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Drummond, I. A., H. D. Rupprecht, P. Rohwer-Nutter, J. M. Lopez-Guisa, S. L. Madden, F. J. Rauscher i V. P. Sukhatme. "DNA recognition by splicing variants of the Wilms' tumor suppressor, WT1". Molecular and Cellular Biology 14, nr 6 (czerwiec 1994): 3800–3809. http://dx.doi.org/10.1128/mcb.14.6.3800-3809.1994.
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The Wilms' tumor suppressor, WT1, is a zinc finger transcriptional regulator which exists as multiple forms owing to alternative mRNA splicing. The most abundant splicing variants contain a nine-nucleotide insertion encoding lysine, threonine, and serine (KTS) in the H-C link region between the third and fourth WT1 zinc fingers which disrupts binding to a previously defined WT1-EGR1 binding site. We have identified WT1[+KTS] binding sites in the insulin-like growth factor II gene and show that WT1[+KTS] represses transcription from the insulin-like growth factor II P3 promoter. The highest affinity WT1[+KTS] DNA binding sites included nucleotide contacts involving all four WT1 zinc fingers. We also found that different subsets of three WT1 zinc fingers could bind to distinct DNA recognition elements. A tumor-associated, WT1 finger 3 deletion mutant was shown to bind to juxtaposed nucleotide triplets for the remaining zinc fingers 1, 2, and 4. The characterization of novel WT1 DNA recognition elements adds a new level of complexity to the potential gene regulatory activity of WT1. The results also present the possibility that altered DNA recognition by the dominant WT1 zinc finger 3 deletion mutant may contribute to tumorigenesis.
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Drummond, I. A., H. D. Rupprecht, P. Rohwer-Nutter, J. M. Lopez-Guisa, S. L. Madden, F. J. Rauscher i V. P. Sukhatme. "DNA recognition by splicing variants of the Wilms' tumor suppressor, WT1." Molecular and Cellular Biology 14, nr 6 (czerwiec 1994): 3800–3809. http://dx.doi.org/10.1128/mcb.14.6.3800.
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The Wilms' tumor suppressor, WT1, is a zinc finger transcriptional regulator which exists as multiple forms owing to alternative mRNA splicing. The most abundant splicing variants contain a nine-nucleotide insertion encoding lysine, threonine, and serine (KTS) in the H-C link region between the third and fourth WT1 zinc fingers which disrupts binding to a previously defined WT1-EGR1 binding site. We have identified WT1[+KTS] binding sites in the insulin-like growth factor II gene and show that WT1[+KTS] represses transcription from the insulin-like growth factor II P3 promoter. The highest affinity WT1[+KTS] DNA binding sites included nucleotide contacts involving all four WT1 zinc fingers. We also found that different subsets of three WT1 zinc fingers could bind to distinct DNA recognition elements. A tumor-associated, WT1 finger 3 deletion mutant was shown to bind to juxtaposed nucleotide triplets for the remaining zinc fingers 1, 2, and 4. The characterization of novel WT1 DNA recognition elements adds a new level of complexity to the potential gene regulatory activity of WT1. The results also present the possibility that altered DNA recognition by the dominant WT1 zinc finger 3 deletion mutant may contribute to tumorigenesis.
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Morris, J. F., R. Hromas i F. J. Rauscher. "Characterization of the DNA-binding properties of the myeloid zinc finger protein MZF1: two independent DNA-binding domains recognize two DNA consensus sequences with a common G-rich core". Molecular and Cellular Biology 14, nr 3 (marzec 1994): 1786–95. http://dx.doi.org/10.1128/mcb.14.3.1786-1795.1994.
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The myeloid zinc finger gene 1, MZF1, encodes a transcription factor which is expressed in hematopoietic progenitor cells that are committed to myeloid lineage differentiation. MZF1 contains 13 C2H2 zinc fingers arranged in two domains which are separated by a short glycine- and proline-rich sequence. The first domain consists of zinc fingers 1 to 4, and the second domain is formed by zinc fingers 5 to 13. We have determined that both sets of zinc finger domains bind DNA. Purified, recombinant MZF1 proteins containing either the first set of zinc fingers or the second set were prepared and used to affinity select DNA sequences from a library of degenerate oligonucleotides by using successive rounds of gel shift followed by PCR amplification. Surprisingly, both DNA-binding domains of MZF1 selected similar DNA-binding consensus sequences containing a core of four or five guanine residues, reminiscent of an NF-kappa B half-site: 1-4, 5'-AGTGGGGA-3'; 5-13, 5'-CGGGnGAGGGGGAA-3'. The full-length MZF1 protein containing both sets of zinc finger DNA-binding domains recognizes synthetic oligonucleotides containing either the 1-4 or 5-13 consensus binding sites in gel shift assays. Thus, we have identified the core DNA consensus binding sites for each of the two DNA-binding domains of a myeloid-specific zinc finger transcription factor. Identification of these DNA-binding sites will allow us to identify target genes regulated by MZF1 and to assess the role of MZF1 as a transcriptional regulator of hematopoiesis.
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Morris, J. F., R. Hromas i F. J. Rauscher. "Characterization of the DNA-binding properties of the myeloid zinc finger protein MZF1: two independent DNA-binding domains recognize two DNA consensus sequences with a common G-rich core." Molecular and Cellular Biology 14, nr 3 (marzec 1994): 1786–95. http://dx.doi.org/10.1128/mcb.14.3.1786.
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The myeloid zinc finger gene 1, MZF1, encodes a transcription factor which is expressed in hematopoietic progenitor cells that are committed to myeloid lineage differentiation. MZF1 contains 13 C2H2 zinc fingers arranged in two domains which are separated by a short glycine- and proline-rich sequence. The first domain consists of zinc fingers 1 to 4, and the second domain is formed by zinc fingers 5 to 13. We have determined that both sets of zinc finger domains bind DNA. Purified, recombinant MZF1 proteins containing either the first set of zinc fingers or the second set were prepared and used to affinity select DNA sequences from a library of degenerate oligonucleotides by using successive rounds of gel shift followed by PCR amplification. Surprisingly, both DNA-binding domains of MZF1 selected similar DNA-binding consensus sequences containing a core of four or five guanine residues, reminiscent of an NF-kappa B half-site: 1-4, 5'-AGTGGGGA-3'; 5-13, 5'-CGGGnGAGGGGGAA-3'. The full-length MZF1 protein containing both sets of zinc finger DNA-binding domains recognizes synthetic oligonucleotides containing either the 1-4 or 5-13 consensus binding sites in gel shift assays. Thus, we have identified the core DNA consensus binding sites for each of the two DNA-binding domains of a myeloid-specific zinc finger transcription factor. Identification of these DNA-binding sites will allow us to identify target genes regulated by MZF1 and to assess the role of MZF1 as a transcriptional regulator of hematopoiesis.
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Schulz, T. C., B. Hopwood, P. D. Rathjen i J. R. Wells. "An unusual arrangement of 13 zinc fingers in the vertebrate gene Z13". Biochemical Journal 311, nr 1 (1.10.1995): 219–24. http://dx.doi.org/10.1042/bj3110219.
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The zinc finger is a protein domain that imparts specific nucleic acid-binding activity on a wide range of functionally important proteins. In this paper we report the molecular cloning and characterization of a novel murine zinc-finger gene, mZ13. Analysis of mZ13 cDNAs revealed that the gene expresses a 794-amino-acid protein encoded by a 2.7 kb transcript. The protein has an unusual arrangement of 13 zinc fingers into a ‘hand’ of 12 tandem fingers and a single isolated finger near the C-terminus. This structural organization is conserved with the probable chicken homologue, cZ13. mZ13 also contained an additional domain at the N-terminus which has previously been implicated in the regulation of zinc-finger transcription factor DNA-binding, via protein-protein interactions. mZ13 expression was detected in a wide range of murine embryonic and adult tissues. The structural organization of mZ13 and its expression profile suggest that it may function as a housekeeping DNA-binding protein that regulates the expression of specific genes.
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Schjerven, Hilde, Seth Frietze, Jami McLaughlin, Donghui Cheng, Peggy Farnham, Owen Witte i Stephen Smale. "Role of Ikaros in hematopoiesis and tumor suppression: Selective functions of individual zinc fingers within the DNA-binding domain of Ikaros. (42.3)". Journal of Immunology 188, nr 1_Supplement (1.05.2012): 42.3. http://dx.doi.org/10.4049/jimmunol.188.supp.42.3.
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Abstract Ikaros, a C2H2 zinc finger transcription factor, is a critical regulator of hematopoiesis and tumor suppression in the lymphoid lineage. The C2H2 zinc finger is the most prevalent DNA-binding motif in mammals, with DNA-binding domains usually containing more tandem fingers than are needed for stable sequence-specific DNA recognition. To examine the reason for the frequent presence of multiple zinc fingers, and to investigate in greater depth the role of Ikaros in hematopoiesis and tumor suppression, we generated mice lacking finger 1 or finger 4 of the 4-finger DNA-binding domain of Ikaros. Each mutant strain exhibited a specific subset of the phenotypes observed with Ikaros null mice. Of particular relevance, fingers 1 and 4 contributed to distinct stages of B- and T-cell development and finger 4 was selectively required for tumor suppression in thymocytes and in a new model of BCR-ABL+ acute lymphoblastic leukemia. These results, combined with transcriptome profiling and DNA-binding analysis, reveal that different subsets of fingers within multi-finger transcription factors can modulate binding to different target sequences and regulate distinct target genes and biological functions. These novel mutant strains provide a powerful tool to elucidate Ikaros' role in hematopoiesis and tumor suppression. Furthermore, this study demonstrates that selective mutagenesis can facilitate efforts to elucidate the functions and mechanisms of action of this prevalent class of factors.
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Klug, Aaron. "The discovery of zinc fingers and their development for practical applications in gene regulation and genome manipulation". Quarterly Reviews of Biophysics 43, nr 1 (luty 2010): 1–21. http://dx.doi.org/10.1017/s0033583510000089.
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AbstractA long-standing goal of molecular biologists has been to construct DNA-binding proteins for the control of gene expression. The classical Cys2His2 (C2H2) zinc finger design is ideally suited for such purposes. Discriminating between closely related DNA sequences both in vitro and in vivo, this naturally occurring design was adopted for engineering zinc finger proteins (ZFPs) to target genes specifically.Zinc fingers were discovered in 1985, arising from the interpretation of our biochemical studies on the interaction of the Xenopus protein transcription factor IIIA (TFIIIA) with 5S RNA. Subsequent structural studies revealed its three-dimensional structure and its interaction with DNA. Each finger constitutes a self-contained domain stabilized by a zinc (Zn) ion ligated to a pair of cysteines and a pair of histidines and also by an inner structural hydrophobic core. This discovery showed not only a new protein fold but also a novel principle of DNA recognition. Whereas other DNA-binding proteins generally make use of the 2-fold symmetry of the double helix, functioning as homo- or heterodimers, zinc fingers can be linked linearly in tandem to recognize nucleic acid sequences of varying lengths. This modular design offers a large number of combinatorial possibilities for the specific recognition of DNA (or RNA). It is therefore not surprising that the zinc finger is found widespread in nature, including 3% of the genes of the human genome.The zinc finger design can be used to construct DNA-binding proteins for specific intervention in gene expression. By fusing selected zinc finger peptides to repression or activation domains, genes can be selectively switched off or on by targeting the peptide to the desired gene target. It was also suggested that by combining an appropriate zinc finger peptide with other effector or functional domains, e.g. from nucleases or integrases to form chimaeric proteins, genomes could be modified or manipulated.The first example of the power of the method was published in 1994 when a three-finger protein was constructed to block the expression of a human oncogene transformed into a mouse cell line. The same paper also described how a reporter gene was activated by targeting an inserted 9-base pair (bp) sequence, which acts as the promoter. Thus, by fusing zinc finger peptides to repression or activation domains, genes can be selectively switched off or on. It was also suggested that, by combining zinc fingers with other effector or functional domains, e.g. from nucleases or integrases, to form chimaeric proteins, genomes could be manipulated or modified.Several applications of such engineered ZFPs are described here, including some of therapeutic importance, and also their adaptation for breeding improved crop plants.
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Li, Yong, Tomoki Kimura, John H. Laity i Glen K. Andrews. "The Zinc-Sensing Mechanism of Mouse MTF-1 Involves Linker Peptides between the Zinc Fingers". Molecular and Cellular Biology 26, nr 15 (1.08.2006): 5580–87. http://dx.doi.org/10.1128/mcb.00471-06.
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ABSTRACT Mouse metal response element-binding transcription factor-1 (MTF-1) regulates the transcription of genes in response to a variety of stimuli, including exposure to zinc or cadmium, hypoxia, and oxidative stress. Each of these stresses may increase labile cellular zinc, leading to nuclear translocation, DNA binding, and transcriptional activation of metallothionein genes (MT genes) by MTF-1. Several lines of evidence suggest that the highly conserved six-zinc finger DNA-binding domain of MTF-1 also functions as a zinc-sensing domain. In this study, we investigated the potential role of the peptide linkers connecting the four N-terminal zinc fingers of MTF-1 in their zinc-sensing function. Each of these three linkers is unique, completely conserved among all known vertebrate MTF-1 orthologs, and different from the canonical Cys2His2 zinc finger TGEKP linker sequence. Replacing the RGEYT linker between zinc fingers 1 and 2 with TGEKP abolished the zinc-sensing function of MTF-1, resulting in constitutive DNA binding, nuclear translocation, and transcriptional activation of the MT-I gene. In contrast, swapping the TKEKP linker between fingers 2 and 3 with TGEKP had little effect on the metal-sensing functions of MTF-1, whereas swapping the canonical linker for the shorter TGKT linker between fingers 3 and 4 rendered MTF-1 less sensitive to zinc-dependent activation both in vivo and in vitro. These observations suggest a mechanism by which physiological concentrations of accessible cellular zinc affect MTF-1 activity. Zinc may modulate highly specific, linker-mediated zinc finger interactions in MTF-1, thus affecting its zinc- and DNA-binding activities, resulting in translocation to the nucleus and binding to the MT-I gene promoter.
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Gianfrancesco, Olympia, Bethany Geary, Abigail L. Savage, Kimberley J. Billingsley, Vivien J. Bubb i John P. Quinn. "The Role of SINE-VNTR-Alu (SVA) Retrotransposons in Shaping the Human Genome". International Journal of Molecular Sciences 20, nr 23 (27.11.2019): 5977. http://dx.doi.org/10.3390/ijms20235977.
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Retrotransposons can alter the regulation of genes both transcriptionally and post-transcriptionally, through mechanisms such as binding transcription factors and alternative splicing of transcripts. SINE-VNTR-Alu (SVA) retrotransposons are the most recently evolved class of retrotransposable elements, found solely in primates, including humans. SVAs are preferentially found at genic, high GC loci, and have been termed “mobile CpG islands”. We hypothesise that the ability of SVAs to mobilise, and their non-random distribution across the genome, may result in differential regulation of certain pathways. We analysed SVA distribution patterns across the human reference genome and identified over-representation of SVAs at zinc finger gene clusters. Zinc finger proteins are able to bind to and repress SVA function through transcriptional and epigenetic mechanisms, and the interplay between SVAs and zinc fingers has been proposed as a major feature of genome evolution. We describe observations relating to the clustering patterns of both reference SVAs and polymorphic SVA insertions at zinc finger gene loci, suggesting that the evolution of this network may be ongoing in humans. Further, we propose a mechanism to direct future research and validation efforts, in which the interplay between zinc fingers and their epigenetic modulation of SVAs may regulate a network of zinc finger genes, with the potential for wider transcriptional consequences.
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Heller, Jennifer, Hilde Schjerven, Ju Qiu, Aileen Lee, Stephen Smale i Liang Zhou. "Selective requirement of Ikaros zinc fingers in Treg and Th17 fate decision. (P1137)". Journal of Immunology 190, nr 1_Supplement (1.05.2013): 50.11. http://dx.doi.org/10.4049/jimmunol.190.supp.50.11.
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Abstract TGF-β is a common factor important for the differentiation of pro-inflammatory Th17 and anti-inflammatory inducible Treg cells. However, the precise molecular mechanisms underlying the fate decision of differentiating CD4+ T cells in the presence of TGF-β is poorly understood. Here, we show that distinctive N-terminal DNA-binding zinc fingers of Ikaros play essential roles in Treg and Th17 fate decision. Ikaros has a highly conserved DNA-binding domain near the N-terminus with four tandem zinc fingers. Zinc fingers 2 and 3 are required for stable binding to DNA, whereas fingers 1 and 4 appear to be important for differentially modulating binding properties to specific sites at target genes. Our data show that T cells lacking Ikaros zinc finger 4 but not 1 failed to differentiate into Foxp3+ Tregs upon TGF-β stimulation. Instead, TGF-β-skewed Ikaros zinc finger 4 mutant cells displayed aberrant upregulation of Th17-associated cytokines IL-17 and IL-22. IL-17 but not IL-22 upregulation is dependent on transcription factor RORγt. Aryl hydrocarbon receptor, an essential transcription factor required for IL-22 expression, was unexpectedly decreased. Together, our data uncover a novel selective requirement for Ikaros zinc fingers in the differentiation of Treg and Th17 cells and an intricate interplay among various transcription factors in programming Th17/Treg lineages. We are currently examining the role of Ikaros zinc finger 4 in infection and autoimmunity.
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de Souza, Natalie. "Zinc-finger nucleases". Nature Methods 8, nr 1 (20.12.2010): 43. http://dx.doi.org/10.1038/nmeth.f.328.
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Schmiedeskamp, Mia, i Rachel E. Klevit. "Zinc finger diversity". Current Opinion in Structural Biology 4, nr 1 (styczeń 1994): 28–35. http://dx.doi.org/10.1016/s0959-440x(94)90056-6.
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Kaptein, Robert. "Zinc-finger structures". Current Biology 2, nr 3 (marzec 1992): 126. http://dx.doi.org/10.1016/0960-9822(92)90247-8.
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Kaptein, Robert. "Zinc-finger structures". Current Opinion in Structural Biology 2, nr 1 (luty 1992): 109–15. http://dx.doi.org/10.1016/0959-440x(92)90185-a.
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Berg, Jeremy M. "Zinc-finger proteins". Current Opinion in Structural Biology 3, nr 1 (luty 1993): 11–16. http://dx.doi.org/10.1016/0959-440x(93)90195-q.
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Sander, J. D., M. L. Maeder, D. Reyon, D. F. Voytas, J. K. Joung i D. Dobbs. "ZiFiT (Zinc Finger Targeter): an updated zinc finger engineering tool". Nucleic Acids Research 38, Web Server (30.04.2010): W462—W468. http://dx.doi.org/10.1093/nar/gkq319.
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Gao, Xiang, Daniel J. Rowley, Xiaowu Gai i Daniel F. Voytas. "Ty5 gag Mutations Increase Retrotransposition and Suggest a Role for Hydrogen Bonding in the Function of the Nucleocapsid Zinc Finger". Journal of Virology 76, nr 7 (1.04.2002): 3240–47. http://dx.doi.org/10.1128/jvi.76.7.3240-3247.2002.
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ABSTRACT The Ty5 retrotransposon of Saccharomyces paradoxus transposes in Saccharomyces cerevisiae at frequencies 1,000-fold lower than do the native Ty1 elements. The low transposition activity of Ty5 could be due to differences in cellular environments between these yeast species or to naturally occurring mutations in Ty5. By screening of a Ty5 mutant library, two single mutants (D252N and Y68C) were each found to increase transposition approximately sixfold. When combined, transposition increased 36-fold, implying that the two mutations act independently. Neither mutation affected Ty5 protein synthesis, processing, cDNA recombination, or target site choice. However, cDNA levels in both single mutants and the double mutant were significantly higher than in the wild type. The D252N mutation resides in the zinc finger of nucleocapsid and increases the potential for hydrogen bonding with nucleic acids. We generated other mutations that increase the hydrogen bonding potential (i.e., D252R and D252K) and found that they similarly increased transposition. This suggests that hydrogen bonding within the zinc finger motif is important for cDNA production and builds upon previous studies implicating basic amino acids flanking the zinc finger as important for zinc finger function. Although NCp zinc fingers differ from the zinc finger motifs of cellular enzymes, the requirement for efficient hydrogen bonding is likely universal.
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Smith, Alexander E. F., Farzin Farzaneh i Kevin G. Ford. "Single zinc-finger extension: enhancing transcriptional activity and specificity of three-zinc-finger proteins". Biological Chemistry 386, nr 2 (1.02.2005): 95–99. http://dx.doi.org/10.1515/bc.2005.012.
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AbstractIn order to demonstrate that an existing zinc-finger protein can be simply modified to enhance DNA binding and sequence discrimination in both episomal and chromatin contexts using existing zinc-finger DNA recognition code data, and without recourse to phage display and selection strategies, we have examined the consequences of a single zinc-finger extension to a synthetic three-zinc-finger VP16 fusion protein, on transcriptional activation from model target promoters harbouring the zinc-finger binding sequences. We report a nearly 10-fold enhanced transcriptional activation by the four-zinc-finger VP16 fusion protein relative to the progenitor three-finger VP16 protein in transient assays and a greater than five-fold enhancement in stable reporter-gene expression assays. A marked decrease in transcriptional activation was evident for the four-zinc-finger derivative from mutated regulatory regions compared to the progenitor protein, as a result of recognition site-size extension. This discriminatory effect was shown to be protein concentration-dependent. These observations suggest that four-zinc-finger proteins are stable functional motifs that can be a significant improvement over the progenitor three-zinc-finger protein, both in terms of specificity and the ability to target transcriptional function to promoters, and that single zinc-finger extension can therefore have a significant impact on DNA zinc-finger protein interactions. This is a simple route for modifying or enhancing the binding properties of existing synthetic zinc-finger-based transcription factors and may be particularly suited for the modification of endogenous zinc-finger transcription factors for promoter biasing applications.
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Belczyk-Ciesielska, Agnieszka, Brigitta Csipak, Bálint Hajdu, Aleksandra Sparavier, Masamitsu N. Asaka, Kyosuke Nagata, Béla Gyurcsik i Wojciech Bal. "Nickel(ii)-promoted specific hydrolysis of zinc finger proteins". Metallomics 10, nr 8 (2018): 1089–98. http://dx.doi.org/10.1039/c8mt00098k.
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The (S/T)XH sequence in Cys2His2zinc fingers can be hydrolytically cleaved by Ni(ii) ions. This reaction can be applied for purification, inhibition or activation of designed zinc finger fusion proteins.
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Shastry, B. S. "Transcription factor IIIA (TFIIIA) in the second decade". Journal of Cell Science 109, nr 3 (1.03.1996): 535–39. http://dx.doi.org/10.1242/jcs.109.3.535.
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Transcription factor IIIA is a very extensively studied eukaryotic gene specific factor. It is a special member of the zinc finger family of nucleic acid binding proteins with multiple functions. Its N-terminal polypeptide (280 amino acid residue containing peptide; finger containing region) carries out sequence specific DNA and RNA binding and the C-terminal peptide (65 amino acid residue containing peptide; non-finger region) is involved in the transactivation process possibly by interacting with other general factors. It is a unique factor in the sense that it binds to two structurally different nucleic acids, DNA and RNA. It accomplishes this function through its zinc fingers, which are arranged into a cluster of nine motifs. Over the past three years there has been considerable interest in determining the structural features of zinc fingers, identifying the fingers that preferentially recognize DNA and RNA, defining the role of metal binding ligands and the linker region in promotor recognition and the role of C-terminal amino acid sequence in the gene activation. This article briefly reviews our current knowledge on this special protein in these areas.
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Kanakoglou, Dimitrios S., Andromachi Pampalou, Lina S. Malakou, Eleftheria Lakiotaki, Theodoros Loupis, Dimitrios M. Vrachnos, Panayiotis D. Glekas i in. "Central Role of C2H2-Type Zinc Finger-Containing Genes in Pediatric Brain Tumors". DNA 2, nr 1 (3.01.2022): 1–21. http://dx.doi.org/10.3390/dna2010001.
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Zinc fingers consist of one of the most abundant motifs in transcription factors and DNA-binding proteins. Recent studies provide evidence on the pathological implication of zinc finger proteins in various neurodevelopmental disorders and malignancies but their role in pediatric brain tumors is largely unexplored. To this end, we investigated the differential expression of zinc finger-containing genes along with relevant biological processes and pathways among four main brain tumor categories (pilocytic astrocytomas, ependymomas, medulloblastomas and glioblastomas). By employing an extended bioinformatic toolset, we performed a preliminary in silico study in order to identify the expression of zinc finger-containing genes and associated functions in pediatric brain tumors. Our data analysis reveals the prominent role of C2H2-type zinc finger-containing genes in the molecular mechanisms underlying pediatric brain tumors followed by the Ring and PHD finger types. Significant dysregulation of ABLIM2 and UHFR1 genes was detected in all tumor types drawing attention to the dysregulation of cell polarization process and Ubiquitin-Proteasome System (UPS) in the pathogenesis of pediatric brain tumors. Moreover, significant gene clustering was observed in multiple locations with two highly visible clusters revealing a contrast in gene regulation between medulloblastomas and the other three brain tumor types, indicating a promising area of future research.
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Guo, Xuemin, John-William N. Carroll, Margaret R. MacDonald, Stephen P. Goff i Guangxia Gao. "The Zinc Finger Antiviral Protein Directly Binds to Specific Viral mRNAs through the CCCH Zinc Finger Motifs". Journal of Virology 78, nr 23 (1.12.2004): 12781–87. http://dx.doi.org/10.1128/jvi.78.23.12781-12787.2004.
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ABSTRACT The zinc finger antiviral protein (ZAP) is a recently isolated host antiviral factor. It specifically inhibits the replication of Moloney murine leukemia virus (MLV) and Sindbis virus (SIN) by preventing the accumulation of viral RNA in the cytoplasm. For this report, we mapped the viral sequences that are sensitive to ZAP inhibition. The viral sequences were cloned into a luciferase reporter and analyzed for the ability to mediate ZAP-dependent destabilization of the reporter. The sensitive sequence in MLV was mapped to the 3′ long terminal repeat; the sensitive sequences in SIN were mapped to multiple fragments. The fragment of SIN that displayed the highest destabilizing activity was further analyzed by deletion mutagenesis for the minimal sequence that retained the activity. This led to the identification of a fragment of 653 nucleotides. Any further deletion of this fragment resulted in significantly lower activity. We provide evidence that ZAP directly binds to the active but not the inactive fragments. The CCCH zinc finger motifs of ZAP play important roles in RNA binding and antiviral activity. Disruption of the second and fourth zinc fingers abolished ZAP's activity, whereas disruption of the first and third fingers just slightly lowered its activity.
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Zhang, XiaoHong, YuJi Miao, XiaoDan Hu, Rui Min, PeiDang Liu i HaiQian Zhang. "Gamma Radiation-Induced Damage in the Zinc Finger of the Transcription Factor IIIA". Bioinorganic Chemistry and Applications 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/1642064.
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A zinc finger motif is an element of proteins that can specifically recognize and bind to DNA. Because they contain multiple cysteine residues, zinc finger motifs possess redox properties. Ionizing radiation generates a variety of free radicals in organisms. Zinc finger motifs, therefore, may be a target of ionizing radiation. The effect of gamma radiation on the zinc finger motifs in transcription factor IIIA (TFIIIA), a zinc finger protein, was investigated. TFIIIA was exposed to different gamma doses from 60Co sources. The dose rates were 0.20 Gy/min and 800 Gy/h, respectively. The binding capacity of zinc finger motifs in TFIIIA was determined using an electrophoretic mobility shift assay. We found that 1000 Gy of gamma radiation impaired the function of the zinc finger motifs in TFIIIA. The sites of radiation-induced damage in the zinc finger were the thiol groups of cysteine residues and zinc (II) ions. The thiol groups were oxidized to form disulfide bonds and the zinc (II) ions were indicated to be reduced to zinc atoms. These results indicate that the zinc finger motif is a target domain for gamma radiation, which may decrease 5S rRNA expression via impairment of the zinc finger motifs in TFIIIA.
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Guo, Jianhui, Tiyun Wu, Jada Anderson, Bradley F. Kane, Donald G. Johnson, Robert J. Gorelick, Louis E. Henderson i Judith G. Levin. "Zinc Finger Structures in the Human Immunodeficiency Virus Type 1 Nucleocapsid Protein Facilitate Efficient Minus- and Plus-Strand Transfer". Journal of Virology 74, nr 19 (1.10.2000): 8980–88. http://dx.doi.org/10.1128/jvi.74.19.8980-8988.2000.
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ABSTRACT The nucleocapsid protein (NC) of human immunodeficiency virus type 1 (HIV-1) has two zinc fingers, each containing the invariant metal ion binding residues CCHC. Recent reports indicate that mutations in the CCHC motifs are deleterious for reverse transcription in vivo. To identify reverse transcriptase (RT) reactions affected by such changes, we have probed zinc finger functions in NC-dependent RT-catalyzed HIV-1 minus- and plus-strand transfer model systems. Our approach was to examine the activities of wild-type NC and a mutant in which all six cysteine residues were replaced by serine (SSHS NC); this mutation severely disrupts zinc coordination. We find that the zinc fingers contribute to the role of NC in complete tRNA primer removal from minus-strand DNA during plus-strand transfer. Annealing of the primer binding site sequences in plus-strand strong-stop DNA [(+) SSDNA] to its complement in minus-strand acceptor DNA is not dependent on NC zinc fingers. In contrast, the rate of annealing of the complementary R regions in (−) SSDNA and 3′ viral RNA during minus-strand transfer is approximately eightfold lower when SSHS NC is used in place of wild-type NC. Moreover, unlike wild-type NC, SSHS NC has only a small stimulatory effect on minus-strand transfer and is essentially unable to block TAR-induced self-priming from (−) SSDNA. Our results strongly suggest that NC zinc finger structures are needed to unfold highly structured RNA and DNA strand transfer intermediates. Thus, it appears that in these cases, zinc finger interactions are important components of NC nucleic acid chaperone activity.
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Ecco, Gabriela, Michael Imbeault i Didier Trono. "KRAB zinc finger proteins". Development 144, nr 15 (1.08.2017): 2719–29. http://dx.doi.org/10.1242/dev.132605.
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Kaiming, Cao, Yaping Sheng, Shihui Zheng, Siming Yuan, Guangming Huang i Yangzhong Liu. "Arsenic trioxide preferentially binds to the ring finger protein PML: understanding target selection of the drug". Metallomics 10, nr 11 (2018): 1564–69. http://dx.doi.org/10.1039/c8mt00202a.
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Sander, J. D., P. Zaback, J. K. Joung, D. F. Voytas i D. Dobbs. "Zinc Finger Targeter (ZiFiT): an engineered zinc finger/target site design tool". Nucleic Acids Research 35, Web Server (8.05.2007): W599—W605. http://dx.doi.org/10.1093/nar/gkm349.
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Buck-Koehntop, Bethany A., Robyn L. Stanfield, Damian C. Ekiert, Maria A. Martinez-Yamout, H. Jane Dyson, Ian A. Wilson i Peter E. Wright. "Molecular basis for recognition of methylated and specific DNA sequences by the zinc finger protein Kaiso". Proceedings of the National Academy of Sciences 109, nr 38 (4.09.2012): 15229–34. http://dx.doi.org/10.1073/pnas.1213726109.
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Methylation of CpG dinucleotides in DNA is a common epigenetic modification in eukaryotes that plays a central role in maintenance of genome stability, gene silencing, genomic imprinting, development, and disease. Kaiso, a bifunctional Cys2His2 zinc finger protein implicated in tumor-cell proliferation, binds to both methylated CpG (mCpG) sites and a specific nonmethylated DNA motif (TCCTGCNA) and represses transcription by recruiting chromatin remodeling corepression machinery to target genes. Here we report structures of the Kaiso zinc finger DNA-binding domain in complex with its nonmethylated, sequence-specific DNA target (KBS) and with a symmetrically methylated DNA sequence derived from the promoter region of E-cadherin. Recognition of specific bases in the major groove of the core KBS and mCpG sites is accomplished through both classical and methyl CH···O hydrogen-bonding interactions with residues in the first two zinc fingers, whereas residues in the C-terminal extension following the third zinc finger bind in the opposing minor groove and are required for high-affinity binding. The C-terminal region is disordered in the free protein and adopts an ordered structure upon binding to DNA. The structures of these Kaiso complexes provide insights into the mechanism by which a zinc finger protein can recognize mCpG sites as well as a specific, nonmethylated regulatory DNA sequence.
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Chavrier, P., P. Lemaire, O. Revelant, R. Bravo i P. Charnay. "Characterization of a mouse multigene family that encodes zinc finger structures". Molecular and Cellular Biology 8, nr 3 (marzec 1988): 1319–26. http://dx.doi.org/10.1128/mcb.8.3.1319-1326.1988.
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The Drosophila segmentation gene Krüppel encodes multiple tandemly repeated units predicted to form DNA-binding zinc fingers. We have isolated 23 bacteriophages, containing nonoverlapping inserts from a mouse genomic DNA library, on the basis of cross-hybridization under nonstringent conditions to a probe corresponding to the Krüppel finger region. Nucleotide sequence analysis of six phage DNAs indicated that they all contained regions with similarity to Krüppel and potentially encoded zinc finger domains. Within these regions, the level of similarity to Krüppel was particularly high between successive fingers. Northern (RNA) blotting analysis suggested that the mouse sequences belonged to different genes, the expression of some of which was modulated during cell differentiation and development. Hybridization experiments suggested that the similarity between some of the genes extended outside of the finger regions. In conclusion, our data suggest that the mouse genome contains a large family of evolutionarily related genes encoding possible trans-acting factors. These genes are likely to play a regulatory role at the transcriptional level.
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Chavrier, P., P. Lemaire, O. Revelant, R. Bravo i P. Charnay. "Characterization of a mouse multigene family that encodes zinc finger structures." Molecular and Cellular Biology 8, nr 3 (marzec 1988): 1319–26. http://dx.doi.org/10.1128/mcb.8.3.1319.
Pełny tekst źródłaStreszczenie:
The Drosophila segmentation gene Krüppel encodes multiple tandemly repeated units predicted to form DNA-binding zinc fingers. We have isolated 23 bacteriophages, containing nonoverlapping inserts from a mouse genomic DNA library, on the basis of cross-hybridization under nonstringent conditions to a probe corresponding to the Krüppel finger region. Nucleotide sequence analysis of six phage DNAs indicated that they all contained regions with similarity to Krüppel and potentially encoded zinc finger domains. Within these regions, the level of similarity to Krüppel was particularly high between successive fingers. Northern (RNA) blotting analysis suggested that the mouse sequences belonged to different genes, the expression of some of which was modulated during cell differentiation and development. Hybridization experiments suggested that the similarity between some of the genes extended outside of the finger regions. In conclusion, our data suggest that the mouse genome contains a large family of evolutionarily related genes encoding possible trans-acting factors. These genes are likely to play a regulatory role at the transcriptional level.
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Huan, Chen, Cai Xiaoxu i Ren Xifang. "Zinc Finger Protein 521, Negatively Regulated by MicroRNA-204-5p, Promotes Proliferation, Motility and Invasion of Gastric Cancer Cells". Technology in Cancer Research & Treatment 18 (1.01.2019): 153303381987478. http://dx.doi.org/10.1177/1533033819874783.
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Objective: This study aims to investigate the expression, role, and detailed mechanism of microRNA-204-5p and zinc finger protein 521 in gastric cancer. Methods: Immunohistochemistry was adopted to detect the expressions of zinc finger protein 521 in 82 cases of gastric cancer tissues. Western blot was used to detect the expressions of zinc finger protein 521 in gastric cancer cells and adjacent cells. Moreover, the correlation between zinc finger protein 521 and the prognosis of patients were also evaluated. Cell Counting Kit 8 assay and colony formation assay were performed to figure out the impact of zinc finger protein 521 on the proliferation of gastric cancer cells. By conducting flow cytometry, the effect of zinc finger protein 521 on the apoptosis of gastric cancer cells was determined. The scratch wound healing assay and transwell invasion assay were carried out to determine the effect of zinc finger protein 521 on regulating the motility and invasion of gastric cancer cells. Ultimately, the targeting relationship and interaction between microRNA-204-5p and zinc finger protein 521 were verified by real-time polymerase chain reaction, Western blot, and dual luciferase reporter gene assay. Results: Compared with adjacent cells, zinc finger protein 521 was highly expressed in gastric cancer cells, which was related to TNM stage ( P = .0388), tumor size ( P = .0168), and local lymph node metastasis ( P = .0024). Overexpressed zinc finger protein 521 can promote the proliferation, migration, and invasion of gastric cancer cells and inhibit the apoptosis. Zinc finger protein 521 is a target gene of microRNA-106-5p, and there was a negative correlation between the expression of zinc finger protein 521 and microRNA-204-5p. Conclusion: Zinc finger protein 521 can arrest the apoptosis and enhance the proliferation, migration, and invasion of gastric cancer cells via regulating microRNA-204-5p. Our study may provide novel clues for the treatment of patients with gastric cancer.
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Blobel, G. A., M. C. Simon i S. H. Orkin. "Rescue of GATA-1-deficient embryonic stem cells by heterologous GATA-binding proteins." Molecular and Cellular Biology 15, nr 2 (luty 1995): 626–33. http://dx.doi.org/10.1128/mcb.15.2.626.
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Totipotent murine embryonic stem (ES) cells can be differentiated in vitro to form embryoid bodies (EBs) containing hematopoietic cells of multiple lineages, including erythroid cells. In vitro erythroid development parallels that which is observed in vivo. ES cells in which the gene for the erythroid transcription factor GATA-1 has been disrupted fail to produce mature erythroid cells either in vivo or in vitro. With the EB in vitro differentiation assay, constructs expressing heterologous GATA-binding proteins were tested for their abilities to correct the developmental defect of GATA-1-deficient ES cells. The results presented here show that the highly divergent chicken GATA-1 can rescue GATA-1 deficiency to an extent similar to that of murine GATA-1 (mGATA-1), as determined by size and morphology of EBs, presence of red cells, and globin gene expression. Furthermore, GATA-3 and GATA-4, which are normally expressed in different tissues, and a protein consisting of the zinc fingers of GATA-1 fused to the herpes simplex virus VP16 transcription activation domain were able to compensate for the GATA-1 defect. Chimeric molecules in which both zinc fingers of mGATA-1 were replaced with the zinc fingers of human GATA-3 or with the single finger of the fungal GATA factor areA, as well as a construct bearing the zinc finger region alone, displayed rescue activity. These results suggest that neither the transcription activation domains of mGATA-1 nor its zinc fingers impart erythroid cell specificity for its action in vivo. Rather, it appears that specificity is mediated through the cis-acting control regions which determine spatial and temporal expression of the GATA-1 gene. Furthermore, our results demonstrate that the zinc finger region may have a biological function in addition to mediating DNA binding.
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Kim, J. G., i L. D. Hudson. "Novel member of the zinc finger superfamily: A C2-HC finger that recognizes a glia-specific gene". Molecular and Cellular Biology 12, nr 12 (grudzień 1992): 5632–39. http://dx.doi.org/10.1128/mcb.12.12.5632-5639.1992.
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A novel member of the zinc finger superfamily was cloned by virtue of its binding to cis-regulatory elements of a glia-specific gene, the myelin proteolipid protein (PLP) gene. Named MyTI (myelin transcription factor I), this gene is most highly transcribed in the developing nervous system, where expression precedes induction of its presumptive target, PLP. Low levels of MyTI transcripts can be detected in nonneural tissues only by polymerase chain reaction analysis. Zinc is a necessary cofactor for DNA binding of MyTI, as the zinc-chelating agent 1,10-orthophenanthroline eliminates binding activity. Zinc may stabilize the DNA-binding domain of MyTI by coordinating three cysteine and one histidine residue in a Cys-X5-Cys-X12-His-X4-Cys (C2-HC) arrangement. The MyTI protein has six fingers of the C2-HC class arranged in two widely separated clusters. These two domains of DNA binding can function independently and recognize the same DNA sequence, suggesting that MyTI may contribute to the higher-order structure of a target promoter by simultaneously binding both proximal and distal sites. The six fingers are highly conserved, suggesting that they arose from successive duplication events, while the linker regions diverge in size and sequence. Both amino acid sequence comparisons and secondary-structure predictions indicate that the C2-HC fingers of MyTI do not resemble the zinc-mediated loops of C2-H2 fingers, C2-C2 fingers, or Cx clusters. MyTI may therefore be the prototype of a new structural family of zinc-stabilized DNA binding proteins.
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Kim, J. G., i L. D. Hudson. "Novel member of the zinc finger superfamily: A C2-HC finger that recognizes a glia-specific gene." Molecular and Cellular Biology 12, nr 12 (grudzień 1992): 5632–39. http://dx.doi.org/10.1128/mcb.12.12.5632.
Pełny tekst źródłaStreszczenie:
A novel member of the zinc finger superfamily was cloned by virtue of its binding to cis-regulatory elements of a glia-specific gene, the myelin proteolipid protein (PLP) gene. Named MyTI (myelin transcription factor I), this gene is most highly transcribed in the developing nervous system, where expression precedes induction of its presumptive target, PLP. Low levels of MyTI transcripts can be detected in nonneural tissues only by polymerase chain reaction analysis. Zinc is a necessary cofactor for DNA binding of MyTI, as the zinc-chelating agent 1,10-orthophenanthroline eliminates binding activity. Zinc may stabilize the DNA-binding domain of MyTI by coordinating three cysteine and one histidine residue in a Cys-X5-Cys-X12-His-X4-Cys (C2-HC) arrangement. The MyTI protein has six fingers of the C2-HC class arranged in two widely separated clusters. These two domains of DNA binding can function independently and recognize the same DNA sequence, suggesting that MyTI may contribute to the higher-order structure of a target promoter by simultaneously binding both proximal and distal sites. The six fingers are highly conserved, suggesting that they arose from successive duplication events, while the linker regions diverge in size and sequence. Both amino acid sequence comparisons and secondary-structure predictions indicate that the C2-HC fingers of MyTI do not resemble the zinc-mediated loops of C2-H2 fingers, C2-C2 fingers, or Cx clusters. MyTI may therefore be the prototype of a new structural family of zinc-stabilized DNA binding proteins.
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Witzgall, R., E. O'Leary, R. Gessner, A. J. Ouellette i J. V. Bonventre. "Kid-1, a putative renal transcription factor: regulation during ontogeny and in response to ischemia and toxic injury". Molecular and Cellular Biology 13, nr 3 (marzec 1993): 1933–42. http://dx.doi.org/10.1128/mcb.13.3.1933-1942.1993.
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We have identified a new putative transcription factor from the rat kidney, termed Kid-1 (for kidney, ischemia and developmentally regulated gene 1). Kid-1 belongs to the C2H2 class of zinc finger genes. Its mRNA accumulates with age in postnatal renal development and is detected predominantly in the kidney. Kid-1 mRNA levels decline after renal injury secondary to ischemia or folic acid administration, two insults which result in epithelial cell dedifferentiation, followed by regenerative hyperplasia and differentiation. The low expression of Kid-1 early in postnatal development, and when renal tissue is recovering after injury, suggests that the gene product is involved in establishment of a differentiated phenotype and/or regulation of the proliferative response. The deduced protein contains 13 C2H2 zinc fingers at the COOH end in groups of 4 and 9 separated by a 32-amino-acid spacer. There are consensus sites for phosphorylation in the NH2 terminus non-zinc finger region as well as in the spacer region between zinc fingers 4 and 5. A region of the deduced protein shares extensive homology with a catalytic region of Raf kinases, a feature shared only with TFIIE among transcription factors. To determine whether Kid-1 can modulate transcription, a chimeric construct encoding the Kid-1 non-zinc finger region (sense or antisense) and the DNA-binding region of GAL4 was transfected into COS and LLC-PK1 cells together with a chloramphenicol acetyltransferase (CAT) reporter plasmid containing GAL4 binding sites, driven by either a minimal promoter or a simian virus 40 enhancer. CAT activity was markedly inhibited in cells transfected with the sense construct compared with the activity in cells transfected with the antisense construct. To our knowledge, this pattern of developmental regulation, kidney expression, and regulation of transcription is unique among the C2H2 class of zinc finger-containing DNA-binding proteins.
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Witzgall, R., E. O'Leary, R. Gessner, A. J. Ouellette i J. V. Bonventre. "Kid-1, a putative renal transcription factor: regulation during ontogeny and in response to ischemia and toxic injury." Molecular and Cellular Biology 13, nr 3 (marzec 1993): 1933–42. http://dx.doi.org/10.1128/mcb.13.3.1933.
Pełny tekst źródłaStreszczenie:
We have identified a new putative transcription factor from the rat kidney, termed Kid-1 (for kidney, ischemia and developmentally regulated gene 1). Kid-1 belongs to the C2H2 class of zinc finger genes. Its mRNA accumulates with age in postnatal renal development and is detected predominantly in the kidney. Kid-1 mRNA levels decline after renal injury secondary to ischemia or folic acid administration, two insults which result in epithelial cell dedifferentiation, followed by regenerative hyperplasia and differentiation. The low expression of Kid-1 early in postnatal development, and when renal tissue is recovering after injury, suggests that the gene product is involved in establishment of a differentiated phenotype and/or regulation of the proliferative response. The deduced protein contains 13 C2H2 zinc fingers at the COOH end in groups of 4 and 9 separated by a 32-amino-acid spacer. There are consensus sites for phosphorylation in the NH2 terminus non-zinc finger region as well as in the spacer region between zinc fingers 4 and 5. A region of the deduced protein shares extensive homology with a catalytic region of Raf kinases, a feature shared only with TFIIE among transcription factors. To determine whether Kid-1 can modulate transcription, a chimeric construct encoding the Kid-1 non-zinc finger region (sense or antisense) and the DNA-binding region of GAL4 was transfected into COS and LLC-PK1 cells together with a chloramphenicol acetyltransferase (CAT) reporter plasmid containing GAL4 binding sites, driven by either a minimal promoter or a simian virus 40 enhancer. CAT activity was markedly inhibited in cells transfected with the sense construct compared with the activity in cells transfected with the antisense construct. To our knowledge, this pattern of developmental regulation, kidney expression, and regulation of transcription is unique among the C2H2 class of zinc finger-containing DNA-binding proteins.
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Galdieri, Luciano, Mitchell Grinwald, Zibi Gugala, Edward Oates i Milan Chheda. "STEM-13. FUNCTIONAL CHARACTERIZATION OF THE ZFHX4-CHD4 INTERACTION IN GLIOBLASTOMA CANCER STEM CELLS". Neuro-Oncology 22, Supplement_2 (listopad 2020): ii199. http://dx.doi.org/10.1093/neuonc/noaa215.830.
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Abstract Glioblastoma stem cells (GSCs) they may be one reason for inevitable recurrence of GBM. We previously discovered that Zinc Finger Homeobox 4 (ZFHX4), a 450kD transcription factor, is required to maintain the GSC state. ZFHX4 interacts with CHD4, a core member of the nucleosome remodeling and deacetylase (NuRD) complex, which activates or represses gene expression via two distinct functions - histone deacetylation and ATP-dependent chromatin remodeling. CHD4 suppression phenocopies ZFHX4 suppression. The precise nature and function of the ZFHX4 interaction with CHD4 is not understood. Here we report that the ZFHX4-CHD4 interaction requires a single zinc-finger domain. An incremental truncation screen revealed that ZFHX4 amino acids 1838 to 2387, which contains zinc fingers 14 and 15, are required to bind CHD4. Disrupting the zinc coordination of zinc finger 14 impaired the ZFHX4-CHD4 interaction. Moreover, by overexpressing ZFHX4 amino acids 1838 to 2487, we decreased CHD4 recruitment to transcription regulatory regions of the stem cell genes SOX2 and SOX9, decreased transcription, and reduced clonogenic self-renewal. These results may provide the structural basis for new treatments to target GSCs and prevent recurrence in this devastating disease.