Bibliografias temáticas / RNA Synthesis

Índice

  1. Artigos de revistas
  2. Teses / dissertações
  3. Livros
  4. Capítulos de livros
  5. Trabalhos de conferências
  6. Relatórios de organizações

Literatura científica selecionada sobre o tema "RNA Synthesis"

Autor: Grafiati
Publicado: 4 de junho de 2021
Última modificação: 28 de janeiro de 2023

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos

Selecione um tipo de fonte:

Consulte a lista de atuais artigos, livros, teses, anais de congressos e outras fontes científicas relevantes para o tema "RNA Synthesis".

Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.

Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.

Artigos de revistas sobre o assunto "RNA Synthesis"

1

Cazenave, C., e O. C. Uhlenbeck. "RNA template-directed RNA synthesis by T7 RNA polymerase." Proceedings of the National Academy of Sciences 91, n.º 15 (19 de julho de 1994): 6972–76. http://dx.doi.org/10.1073/pnas.91.15.6972.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Beerens, Nancy, Barbara Selisko, Stefano Ricagno, Isabelle Imbert, Linda van der Zanden, Eric J. Snijder e Bruno Canard. "De Novo Initiation of RNA Synthesis by the Arterivirus RNA-Dependent RNA Polymerase". Journal of Virology 81, n.º 16 (30 de maio de 2007): 8384–95. http://dx.doi.org/10.1128/jvi.00564-07.

Texto completo da fonte
Resumo:
ABSTRACT All plus-strand RNA viruses encode an RNA-dependent RNA polymerase (RdRp) that functions as the catalytic subunit of the viral replication/transcription complex, directing viral RNA synthesis in concert with other viral proteins and, sometimes, host proteins. RNA synthesis essentially can be initiated by two different mechanisms, de novo initiation and primer-dependent initiation. Most viral RdRps have been identified solely on the basis of comparative sequence analysis, and for many viruses the mechanism of initiation is unknown. In this study, using the family prototype equine arteritis virus (EAV), we address the mechanism of initiation of RNA synthesis in arteriviruses. The RdRp domains of the members of the arterivirus family, which are part of replicase subunit nsp9, were compared to coronavirus RdRps that belong to the same order of Nidovirales, as well as to other RdRps with known initiation mechanisms and three-dimensional structures. We report here the first successful expression and purification of an arterivirus RdRp that is catalytically active in the absence of other viral or cellular proteins. The EAV nsp9/RdRp initiates RNA synthesis by a de novo mechanism on homopolymeric templates in a template-specific manner. In addition, the requirements for initiation of RNA synthesis from the 3′ end of the viral genome were studied in vivo using a reverse genetics approach. These studies suggest that the 3′-terminal nucleotides of the EAV genome play a critical role in viral RNA synthesis.
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Doudna, Jennifer A., e Jack W. Szostak. "RNA-catalysed synthesis of complementary-strand RNA". Nature 339, n.º 6225 (junho de 1989): 519–22. http://dx.doi.org/10.1038/339519a0.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Illangasekare, M., G. Sanchez, T. Nickles e M. Yarus. "Aminoacyl-RNA synthesis catalyzed by an RNA". Science 267, n.º 5198 (3 de fevereiro de 1995): 643–47. http://dx.doi.org/10.1126/science.7530860.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Doudna, J. A., e J. W. Szostak. "RNA-catalysed synthesis of complementary strand RNA". Trends in Genetics 5 (1989): 323. http://dx.doi.org/10.1016/0168-9525(89)90125-x.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Sivakumaran, K., e C. Cheng Kao. "Initiation of Genomic Plus-Strand RNA Synthesis from DNA and RNA Templates by a Viral RNA-Dependent RNA Polymerase". Journal of Virology 73, n.º 8 (1 de agosto de 1999): 6415–23. http://dx.doi.org/10.1128/jvi.73.8.6415-6423.1999.

Texto completo da fonte
Resumo:
ABSTRACT In contrast to the synthesis of minus-strand genomic and plus-strand subgenomic RNAs, the requirements for brome mosaic virus (BMV) genomic plus-strand RNA synthesis in vitro have not been previously reported. Therefore, little is known about the biochemical requirements for directing genomic plus-strand synthesis. Using DNA templates to characterize the requirements for RNA-dependent RNA polymerase template recognition, we found that initiation from the 3′ end of a template requires one nucleotide 3′ of the initiation nucleotide. The addition of a nontemplated nucleotide at the 3′ end of minus-strand BMV RNAs led to initiation of genomic plus-strand RNA in vitro. Genomic plus-strand initiation was specific since cucumber mosaic virus minus-strand RNA templates were unable to direct efficient synthesis under the same conditions. In addition, mutational analysis of the minus-strand template revealed that the −1 nontemplated nucleotide, along with the +1 cytidylate and +2 adenylate, is important for RNA-dependent RNA polymerase interaction. Furthermore, genomic plus-strand RNA synthesis is affected by sequences 5′ of the initiation site.
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Röthlisberger, Pascal, Christian Berk e Jonathan Hall. "RNA Chemistry for RNA Biology". CHIMIA International Journal for Chemistry 73, n.º 5 (29 de maio de 2019): 368–73. http://dx.doi.org/10.2533/chimia.2019.368.

Texto completo da fonte
Resumo:
Advances in the chemical synthesis of RNA have opened new possibilities to address current questions in RNA biology. Access to site-specifically modified oligoribonucleotides is often a pre-requisite for RNA chemical-biology projects. Driven by the enormous research efforts for development of oligonucleotide therapeutics, a wide range of chemical modifications have been developed to modulate the intrinsic properties of nucleic acids in order to fit their use as therapeutics or research tools. The RNA synthesis platform, supported by the NCCR RNA & Disease, aims to provide access to a large variety of chemically modified nucleic acids. In this review, we describe some of the recent projects that involved work of the platform and highlight how RNA chemistry supports new discoveries in RNA biology.
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Modahl, Lucy E., Thomas B. Macnaughton, Nongliao Zhu, Deborah L. Johnson e Michael M. C. Lai. "RNA-Dependent Replication and Transcription of Hepatitis Delta Virus RNA Involve Distinct Cellular RNA Polymerases". Molecular and Cellular Biology 20, n.º 16 (15 de agosto de 2000): 6030–39. http://dx.doi.org/10.1128/mcb.20.16.6030-6039.2000.

Texto completo da fonte
Resumo:
ABSTRACT Cellular DNA-dependent RNA polymerase II (pol II) has been postulated to carry out RNA-dependent RNA replication and transcription of hepatitis delta virus (HDV) RNA, generating a full-length (1.7-kb) RNA genome and a subgenomic-length (0.8-kb) mRNA. However, the supporting evidence for this hypothesis was ambiguous because the previous experiments relied on DNA-templated transcription to initiate HDV RNA synthesis. Furthermore, there is no evidence that the same cellular enzyme is involved in the synthesis of both RNA species. In this study, we used a novel HDV RNA-based transfection approach, devoid of any artificial HDV cDNA intermediates, to determine the enzymatic and metabolic requirements for the synthesis of these two RNA species. We showed that HDV subgenomic mRNA transcription was inhibited by a low concentration of α-amanitin (<3 μg/ml) and could be partially restored by an α-amanitin-resistant mutant pol II; however, surprisingly, the synthesis of the full-length (1.7-kb) antigenomic RNA was not affected by α-amanitin to a concentration higher than 25 μg/ml. By several other criteria, such as the differing requirement for the de novo-synthesized hepatitis delta antigen and temperature dependence, we further showed that the metabolic requirements of subgenomic HDV mRNA synthesis are different from those for the synthesis of genomic-length HDV RNA and cellular pol II transcripts. The synthesis of the two HDV RNA species could also be uncoupled under several different conditions. These findings provide strong evidence that pol II, or proteins derived from pol II transcripts, is involved in mRNA transcription from the HDV RNA template. In contrast, the synthesis of the 1.7-kb HDV antigenomic RNA appears not to be dependent on pol II. These results reveal that there are distinct molecular mechanisms for the synthesis of these two RNA species.
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Rohayem, Jacques, Katrin Jäger, Ivonne Robel, Ulrike Scheffler, Achim Temme e Wolfram Rudolph. "Characterization of norovirus 3Dpol RNA-dependent RNA polymerase activity and initiation of RNA synthesis". Journal of General Virology 87, n.º 9 (1 de setembro de 2006): 2621–30. http://dx.doi.org/10.1099/vir.0.81802-0.

Texto completo da fonte
Resumo:
Norovirus (NV) 3Dpol is a non-structural protein predicted to play an essential role in the replication of the NV genome. In this study, the characteristics of NV 3Dpol activity and initiation of RNA synthesis have been examined in vitro. Recombinant NV 3Dpol, as well as a 3Dpol active-site mutant were expressed in Escherichia coli and purified. NV 3Dpol was able to synthesize RNA in vitro and displayed flexibility with respect to the use of Mg2+ or Mn2+ as a cofactor. NV 3Dpol yielded two different products when incubated with synthetic RNA in vitro: (i) a double-stranded RNA consisting of two single strands of opposite polarity or (ii) the single-stranded RNA template labelled at its 3′ terminus by terminal transferase activity. Initiation of RNA synthesis occurred de novo rather than by back-priming, as evidenced by the fact that the two strands of the double-stranded RNA product could be separated, and by dissociation in time-course analysis of terminal transferase and RNA synthesis activities. In addition, RNA synthesis was not affected by blocking of the 3′ terminus of the RNA template by a chain terminator, sustaining de novo initiation of RNA synthesis. NV 3Dpol displays in vitro properties characteristic of RNA-dependent RNA polymerases, allowing the implementation of this in vitro enzymic assay for the development and validation of antiviral drugs against NV, a so far non-cultivated virus and an important human pathogen.
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Guo, Hui, Mengyue Fan, Zengjin Li, Wei Tang e Xinrui Duan. "Ratiometric RNA aptamer/fluorophore complex for RNA synthesis detection". Analytical Methods 10, n.º 47 (2018): 5629–33. http://dx.doi.org/10.1039/c8ay01880d.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Teses / dissertações sobre o assunto "RNA Synthesis"

1

Peters, D. W. "RNA synthesis in Candida albicans". Thesis, University of Warwick, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373051.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Fritz, Sarah E. "Molecular basis of the DExH-box RNA helicase RNA helicase A (RHA/DHX9) in eukaryotic protein synthesis". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437413252.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Lackey, Jeremy. "New methods for the synthesis of RNA, novel RNA pro-drugs and RNA microarrays". Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92290.

Texto completo da fonte
Resumo:
The demand for synthetic oligonucleotides has grown exponentially over the past decades as genome sequencing, functional genomics, polymerase chain reaction (PCR)-based detection methods, and gene silencing via RNA interference (RNAi) consume enormous numbers of DNA and RNA oligonucleotides. Although various RNA synthesis chemistries now allow oligoribonucleotides to be produced routinely, the higher complexity and cost of RNA (over DNA) has somewhat limited its availability.
A major goal of this thesis work was aimed at finding ribonucleoside synthons that potentially benefit two critical aspects of RNA manufacturing: yield and ease of post-synthesis processing. Towards these goals, we developed methods for the synthesis of RNA using 2'-O-Lv and 2'-O-acetal Lv (ALE) ribonucleoside derivatives. Deprotection of the RNA chains consisted of a three-step deprotection scheme, which eliminated the need for any harsh basic hydrolytic steps, generally composed of: (1) treatment with anhydrous NEt3 (r.t., 1 h) to deblock the phosphate's cyanoethyl groups; (2) hydrazinolysis (r.t., 30 min – 4 h) to simultaneously deprotect the nucleobases and 2'-OH positions, and (3) fluoride treatment (r.t., 30 min) to effect cleavage from the controlled pore glass solid support. Significantly, the rather mild conditions to remove 2'-O-Lv or 2'-O-ALE protecting groups did not lead to RNA strand scission. Furthermore, in the case of 2'-O-ALE protection, higher step-wise monomer coupling yields (~98.7%) was possible, since the ALE protection is less bulky than conventional silyl protection, i.e. TBDMS. Furthermore, both 2'-O-Lv or 2'O-ALE chemistries are completely compatible with the synthesis cycles used by all automated gene synthesizers.
With adjustments in protecting group strategies for the 5'-OH, exocyclic amino nucleobase groups and the development of a light-labile solid support, two other major goals were achieved: (1) the first in situ synthesis of RNA on microarrays, and (2) synthesis of chemically modified RNA strands with 2'-O-acetal ester and 2'-O-acetal ester pyrrolidines in order to increase lipophilicity and cellular permeability over native RNA. When RNA synthesis was carried out with 5'-O-NPPOC 2'-O-ALE monomers on a microarray ("chip"), deprotection typically involved (1) cleavage of the photolabile 5'-protecting group; (2) treatment with anhydrous NEt3 (r.t., 1 h) to deblock the phosphate's cyanoethyl groups; (3) hydrazinolysis (r.t., 30 min – 4 h) to simultaneously deprotect bases and 2'-OH positions. The latter step could also be accomplished with ethylenediamine at room temperature. An RNase A assay was performed as "proof-of-principle" to demonstrate the value of a DNA-RNA microarray for studying enzyme kinetics and specificity on oligonucleotide based libraries. We showed that RNase A acts effectively on a DNA-RNA substrate with measurable kinetics analogous to those of the reference substrates.
The novel 2'-O-modified RNA were tested as short interfering RNA pro-drugs ("pro-siRNA") that would cross the cell membrane and be hydrolyzed (at the 2'-O-ester groups) by ubiquitous esterases to release the active (siRNA) molecules. Indeed, both siRNA and pro-siRNA prepared via 2'-O-ALE chemistry were shown to be active in an RNAi luciferase gene knockdown assay, confirming the integrity of the synthesized RNA strands and the promise of the pro-siRNA approach.
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Johnston, Julie Catherine. "In vitro translation of cucumber necrosis virus RNA". Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/28969.

Texto completo da fonte
Resumo:
The in vitro translation products directed by cucumber necrosis virus (CNV) RNA were analyzed in both rabbit reticulocyte lysate and wheat germ extract cell-free translation systems. In rabbit reticulocyte lysates, one major protein of ca. 33 Mr was produced. In wheat germ extracts, four proteins of ca. 41, 33, 21 and 20 Mr were produced. Hybrid-arrested translation (HART) studies using synthetic CNV antisense RNA corresponding to the entire CNV genome demonstrated that the four major proteins synthesized from CNV virion RNA in wheat germ extracts are virus-specific translation products. The genomic locations of the CNV in vitro translation products were determined using a number of experimental approaches including: (1) HART using antisense RNA corresponding to selected regions of the CNV genome; (2) in vitro translation of synthetic messenger-sense CNV transcripts; (3) immunoprecipitation of in vitro translation products with CNV polyclonal antisera and (4) in vitro translation of size-fractionated CNV virion RNA. Together, these experiments demonstrated that the ca. 33 Mr protein is derived from the 5' proximal coding region, the ca. 41 Mr protein is derived from an internal coding region, and that at least one but probably both of the ca. 20 and 21 Mr proteins are derived from the 3' terminal coding region(s) of the CNV genome. In addition, immunoprecipitation experiments provided further evidence that the ca. 41 Mr protein is the viral coat protein. The size, number, and genomic locations of the CNV in vitro translation products reported here are in agreement with those predicted from nucleotide sequence data (Rochon & Tremaine, 1989). The natural template for the expression of downstream cistrons in the CNV genome was investigated by in vitro translation of sucrose fractionated CNV virion RNA as well as in vitro translation of messenger-sense synthetic transcripts. These studies indicate that in vitro, both subgenomic and genomic-length CNV RNA molecules may act as templates for the synthesis of the ca. 41,21 and 20 Mr proteins as well as the ca. 33 Mr protein.
Land and Food Systems, Faculty of
Graduate
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Attwater, James. "Ice as a medium for RNA-catalysed RNA synthesis and evolution". Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/246525.

Texto completo da fonte
Resumo:
A critical event in the origin of life is thought to have been the emergence of a molecule capable of self-replication and evolution. According to the RNA World hypothesis, this could have been an RNA polymerase ribozyme capable of generating copies of itself from simple nucleotide precursors. In vitro evolution experiments have provided modern examples of such ribozymes, such as the R18 RNA polymerase ribozyme, exhibiting basic levels of this crucial catalytic activity; R18’s activity, however, falls far short of that required of an RNA replicase, leaving unanswered the question of whether RNA can catalyse its self-replication. This thesis describes the development and use of a novel in vitro selection system, Compartmentalised Bead-Tagging (CBT), to isolate variants of the R18 ribozyme with improved sequence generality and extension capabilities. CBT evolution and engineering of polymerase ribozymes, together with RNA template evolution, allowed the synthesis of RNA molecules over 100 nucleotides long, as well as the RNA-catalysed transcription of a catalytic hammerhead ribozyme. This demonstrates the catalytic capabilities of ribozyme polymerases. The R18 ribozyme was also exploited as an analogue of a primordial replicase, to determine replicase behaviour in different reaction environments. Substantial ribozyme polymerisation occurred at −7˚C in the liquid eutectic phase of water-ice; increased ribozyme stability at these low temperatures allowed longer extension products to be generated than at ambient temperatures. The concentration effect of eutectic phase formation could also yield RNA synthesis from dilute solutions of substrates, and provide quasicellular compartmentalisation of ribozymes. These beneficial physicochemical features of ice make it a potential protocellular medium for the emergence of primordial replicases. Ice also could serve as a medium for CBT, allowing the isolation of a polymerase ribozyme adapted to the low temperatures in the ice phase, demonstrating the primordial potential and modern feasibility of ribozyme evolution in ice.
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Collis, Alana E. C. "The synthesis of vinylphosphonate-linked RNA". Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/10541/.

Texto completo da fonte
Resumo:
An introductory chapter discusses the steric block, RNase H and RNA interference antisense mechanisms and the application of antisense nucleic acids as therapeutic agents. Examples of existing chemical modifications of the sugar and backbone regions of nucleic acids are given, followed by the introduction of the vinylphosphonate modification. The vinylphosphonate has previously been examined in DNA and has been synthesised by either Pd(0) catalysed cross-coupling of an H-phosphonate with a vinyl bromide, or by the cross-metathesis of a vinylphosphonate with a terminal olefin. This thesis details the first examples of the vinylphosphonate modification in RNA. The initial aim of this project was the synthesis of a range of nucleosides where the 5'-C-O was replaced by a vinyl bromide carbon-carbon double bond. Starting from alpha-D-glucose, acid catalysed formation of the 1,2:5,6-diisopropylidene alpha-D-glucofuranose was carried out followed by protection of the 3-OH as an acetate. The 5,6-isopropylidene was then subjected to H5IO6 mediated one-pot hydrolysis-oxidative cleavage to obtain the 5-aldehyde. Wittig olefination using CBr4 and Ph3P led to the dibromo olefin which was then stereoselectively reduced using dimethyl phosphite and diisopropylamine to obtain the pure trans-vinyl bromide. Following hydrolysis of the acetate, the stereochemistry of the 3-OH was then inverted by sequential oxidation and reduction. With the correct stereochemistry, the 3-OH was protected as the 2-methylnaphthyl ether. The 1,2-isopropylidene moiety was then hydrolysed and acetylated to the bis-acetate which was subjected to Vorbruggen conditions obtaining the uridine (93%), adenosine (77%), cytidine (30) and guanosine (63%) vinyl bromide nucleosides. The 2'-OAc of the nucleosides were hydrolysed to the 2'-OH in yields of 74-92%. The uridine 2'-OH was protected as the 2'-OTBS ether (98%), analogous to the commercially available phosphoramidites used in automated oligonucleotide synthesis. Similarly, the adenosine and uridine nucleosides could also be blocked as the 2'-OMe (59% and 73% respectively). In the case of the uridine vinyl bromide, the 3'-O-(2-methylnaphthyl) protecting group was cleaved using DDQ, this then enabled the vinylphosphonate-linked uridine dinucleotides to be functionalised at the 3'-OH as the cyanoethyl phosphoramidite using N,N-diisopropyl-2-cyanoethyl-chlorophosphoramidite, DIPEA and DMAP in dichloromethane (2'-OTBS 74%, 2'-OMe 41%). These could then be used in automated solid phase oligonucleotide synthesis. The H-phosphonates were prepared in a single step form the commercially available phosphoramidites using a tetrazole. These were then coupled to the vinyl bromide nucleosides using standard conditions of Pd(OAc)2 (0.2 eq.), dppf (0.4 eq.) and propylene oxide (20 eq.) in THF at 70 oC in a sealed vial for 6 hours. A range of vinylphosphonate-linked dinucleotides were accessed in yields of 61-99%. A detailed experimental section at the end of this thesis describes the procedures used in the synthesis and the analysis of the structures obtained.
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Liu, Qi. "Synthesis of small molecules targeting RNA /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3142456.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

D'Abramo, Claudia M. "Biochemical characterization of the BVDV RNA-dependent RNA polymerase during initiation and elongation of RNA synthesis". Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111870.

Texto completo da fonte
Resumo:
The RNA-dependent RNA polymerase (RdRp) of viruses belonging to the Flaviviridae family, including the hepatitis C virus (HCV) and bovine viral diarrhea virus (BVDV) is critical for viral replication. The major goal of this PhD study was to biochemically characterize the role of the polymerase during initiation and elongation of RNA synthesis, utilizing the BVDV RdRp as a model system. We showed that the BVDV polymerase efficiently incorporates chain-terminating nucleoside analogues, which ultimately arrest RNA synthesis. The incorporated chain-terminators, however, can be removed from the primer terminus in the presence of pyrophosphate (PPi). These results suggest that the phosphorolytic excision of incorporated chain-terminators is a possible mechanism that can diminish the efficiency of this class of compounds against viral RdRps. The chain-terminators then served as valuable tools in subsequent experiments to analyze the functional role(s) of the RdRp-associated GTP-specific binding site (G-site) and the consequences of GTP binding during the initiation of RNA synthesis. The results provide biochemical evidence for the existence of a G-site in the BVDV enzyme, and suggest that GTP binding controls template positioning during de novo initiation. Finally, through the development of a novel ribonuclease-based footprinting assay, it was determined that catalytically active complexes contact the newly synthesized RNA during elongation of RNA synthesis with approximately 6-7 base pairs. The polymerase moves along the template according to the position where RNA synthesis is arrested. Taken together, this study provides novel insight into mechanisms involved during initiation and elongation of RNA replication of viruses belonging to the Flaviviridae family. The ability of RdRps to excise incorporated chain-terminators points to possible shortcomings of nucleoside analogue inhibitors that are under development as antiviral agents for the treatment of infection with HCV.
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Repass, John F. "Studies of murine coronavirus cis-acting RNA elements that affect RNA synthesis /". Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Gilea, Manuela Aurora. "DNA and RNA synthesis in ionic liquids". Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485198.

Texto completo da fonte
Resumo:
The solid-phase synthesis of oligonucleotide derivatives such as phosphorothioates and phosphoroselenoates was investigated. Some ionic liquids containing the trlbexyl(tetradecyl)phosphonium cation and various anions proved to be very effective in dissolving the chalcogens (sulfur and , selenium) and to prepare oligonucleoside chalcogenophosphates. The suitability ofionic liquid-based chalcogen-transfer mixtures for the synthesis of oligonucleoside chalcogenophosphates on solid-phase was evaluated and subsequently the structure-activity relationship studied in detail. The compatibility of ionic liquid-based chalcogen-transfer mixtures with diverse types of solid supports e.g. controlled-pore glass, poly(vinylacetate) and. different synthetic methods. e.g. phosphoramidite and H-phosphonate method makes them useful as replacement of the more expensive and relatively unstable commerciaily avai1able chalcogen-transfer reagents. The distillation of ionic liquids was also studied.
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Livros sobre o assunto "RNA Synthesis"

1

Peters, David William. RNA synthesis in 'Candida albicans'. [s.l.]: typescript, 1985.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

L, Hatfield Dolph, Lee Byeong J e Pirtle Robert M, eds. Transfer RNA in protein synthesis. Boca Raton: CRC Press, 1992.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Conn, Graeme L., ed. Recombinant and In Vitro RNA Synthesis. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-62703-113-4.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

A, Narang Saran, ed. Synthesis and applications of DNA and RNA. Orlando: Academic Press, 1987.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Johnson, Moira A. Kinetics of RNA synthesis in rotavirus infected cells. [s.l.]: typescript, 1988.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

1947-, Witkowski J. A., ed. The inside story: DNA to RNA to protein. Woodbury, N.Y: Cold Spring Harbor Laboratory Press, 2005.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

service), ScienceDirect (Online, ed. RNA turnover in bacteria, archaea and organelles. San Diego, Calif: Academic Press/Elsevier, 2008.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Structural aspects of protein synthesis. Singapore: World Scientific, 2005.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Måns, Ehrenberg, ed. Structural aspects of protein synthesis. 2a ed. New Jersey: World Scientific, 2013.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Cong he cheng dan bai zhi dao he cheng he suan: From protein synthesis to nucleic acid synthesis. Changsha Shi: Hunan jiao yu chu ban she, 2009.

Encontre o texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
Mais fontes

Capítulos de livros sobre o assunto "RNA Synthesis"

1

Beckert, Bertrand, e Benoît Masquida. "Synthesis of RNA by In Vitro Transcription". In RNA, 29–41. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-59745-248-9_3.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Johnson, Kyle L., e Peter Sarnow. "Viral RNA Synthesis". In Human Enterovirus Infections, 95–112. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555818326.ch4.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Merkl, Philipp E., Christopher Schächner, Michael Pilsl, Katrin Schwank, Catharina Schmid, Gernot Längst, Philipp Milkereit, Joachim Griesenbeck e Herbert Tschochner. "Specialization of RNA Polymerase I in Comparison to Other Nuclear RNA Polymerases of Saccharomyces cerevisiae". In Ribosome Biogenesis, 63–70. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2501-9_4.

Texto completo da fonte
Resumo:
AbstractIn archaea and bacteria the major classes of RNAs are synthesized by one DNA-dependent RNA polymerase (RNAP). In contrast, most eukaryotes have three highly specialized RNAPs to transcribe the nuclear genome. RNAP I synthesizes almost exclusively ribosomal (r)RNA, RNAP II synthesizes mRNA as well as many noncoding RNAs involved in RNA processing or RNA silencing pathways and RNAP III synthesizes mainly tRNA and 5S rRNA. This review discusses functional differences of the three nuclear core RNAPs in the yeast S. cerevisiae with a particular focus on RNAP I transcription of nucleolar ribosomal (r)DNA chromatin.
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

van den Born, Erwin, e Eric J. Snijder. "RNA Signals Regulating Nidovirus RNA Synthesis". In Nidoviruses, 115–31. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815790.ch8.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Engels, Joachim W., Dalibor Odadzic, Romualdas Smicius e Jens Haas. "Chemical Synthesis of 2′-O-Alkylated siRNAs". In RNA Interference, 155–70. Totowa, NJ: Humana Press, 2010. http://dx.doi.org/10.1007/978-1-60761-588-0_10.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Schächner, Christopher, Philipp E. Merkl, Michael Pilsl, Katrin Schwank, Kristin Hergert, Sebastian Kruse, Philipp Milkereit, Herbert Tschochner e Joachim Griesenbeck. "Establishment and Maintenance of Open Ribosomal RNA Gene Chromatin States in Eukaryotes". In Ribosome Biogenesis, 25–38. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2501-9_2.

Texto completo da fonte
Resumo:
AbstractIn growing eukaryotic cells, nuclear ribosomal (r)RNA synthesis by RNA polymerase (RNAP) I accounts for the vast majority of cellular transcription. This high output is achieved by the presence of multiple copies of rRNA genes in eukaryotic genomes transcribed at a high rate. In contrast to most of the other transcribed genomic loci, actively transcribed rRNA genes are largely devoid of nucleosomes adapting a characteristic “open” chromatin state, whereas a significant fraction of rRNA genes resides in a transcriptionally inactive nucleosomal “closed” chromatin state. Here, we review our current knowledge about the nature of open rRNA gene chromatin and discuss how this state may be established.
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Snijder, Eric J. "Arterivirus RNA Synthesis Dissected". In Advances in Experimental Medicine and Biology, 241–53. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1325-4_39.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Höbartner, Claudia. "Chemical Synthesis of RNA". In Alternative pre-mRNA Splicing, 154–62. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527636778.ch14.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Merkl, Philipp E., Christopher Schächner, Michael Pilsl, Katrin Schwank, Kristin Hergert, Gernot Längst, Philipp Milkereit, Joachim Griesenbeck e Herbert Tschochner. "Analysis of Yeast RNAP I Transcription of Nucleosomal Templates In Vitro". In Ribosome Biogenesis, 39–59. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2501-9_3.

Texto completo da fonte
Resumo:
AbstractNuclear eukaryotic RNA polymerases (RNAPs) transcribe a chromatin template in vivo. Since the basic unit of chromatin, the nucleosome, renders the DNA largely inaccessible, RNAPs have to overcome the nucleosomal barrier for efficient RNA synthesis. Gaining mechanistical insights in the transcription of chromatin templates will be essential to understand the complex process of eukaryotic gene expression. In this article we describe the use of defined in vitro transcription systems for comparative analysis of highly purified RNAPs I–III from S. cerevisiae (hereafter called yeast) transcribing in vitro reconstituted nucleosomal templates. We also provide a protocol to study promoter-dependent RNAP I transcription of purified native 35S ribosomal RNA (rRNA) gene chromatin.
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Sproat, Brian S. "Chemical RNA Synthesis, Purification, and Analysis". In Handbook of RNA Biochemistry, 129–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527647064.ch7.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.

Trabalhos de conferências sobre o assunto "RNA Synthesis"

1

Wachowius, Falk, Giuseppe Sicoli, Marina Bennati e Claudia Höbartner. "Synthesis of spin-labeled RNA and probing of RNA secondary structures by pulsed EPR spectroscopy". In XVth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2011. http://dx.doi.org/10.1135/css201112336.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Akama, Satoru, Masayuki Yamamura e Takanori Kigawa. "Multi-Objective Robust Optimization for In Vitro RNA Synthesis". In Computational Intelligence and Bioinformatics / Modelling, Simulation, and Identification. Calgary,AB,Canada: ACTAPRESS, 2012. http://dx.doi.org/10.2316/p.2012.753-017.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Akama, Satoru, Masayuki Yamamura e Takanori Kigawa. "Multi-Objective Robust Optimization for In Vitro RNA Synthesis". In Computational Intelligence and Bioinformatics / Modelling, Simulation, and Identification. Calgary,AB,Canada: ACTAPRESS, 2011. http://dx.doi.org/10.2316/p.2011.753-017.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Božilović, Jelena, Jan W. Bats e Joachim W. Engels. "Synthesis and crystal structures of fluorinated indols as RNA analogues". In XIIIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2005. http://dx.doi.org/10.1135/css200507385.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Rieder, Renate, Kathrin Lang, Barbara Puffer, Holger Moroder, Dagmar Graber, Ulrike Rieder, Jessica Steger et al. "Chemical synthesis in RNA research: from riboswitch to ribosome function". In XIVth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2008. http://dx.doi.org/10.1135/css200810121.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Dupouy, Christelle, Annabelle Biscans, Nicholas Ader, Georg Sczakiel, Jean-Jacques Vasseur e Françoise Debart. "A straightforward synthesis of RNA prodrugs bearing biolabile pivaloyloxymethyl groups". In XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414133.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Sekine, Mitsuo, Yoshiaki Masaki, Takeshi Yamada, Youdai Ishii, Keishi Yamamoto, Natsuki Okaniwa, Takeshi Kanamori et al. "Synthesis and properties of base or sugar modified RNA derivatives". In XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414167.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Badelt, Stefan, Christoph Flamm e Ivo Hofacker. "Computational Design of a Circular RNA with Prion-Like Behavior". In Artificial Life 14: International Conference on the Synthesis and Simulation of Living Systems. The MIT Press, 2014. http://dx.doi.org/10.7551/978-0-262-32621-6-ch091.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Mellal, Dénia, Matthieu Fonvielle, Michel Arthur e Mélanie Ethève-Quelquejeu. "Peptidyl-RNA conjugates to explore non-ribosomal peptide synthesis in bacteria". In XVIth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2014. http://dx.doi.org/10.1135/css201414076.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Jin, Rui, Faken Liu, Xiuju Liu, Henry Huang, Scott C. Wilkinson, Diansheng Zhong, Fadlo R. Khuri et al. "Abstract 4770: The regulation of pre-ribosomal RNA synthesis by LKB1". In Proceedings: AACR 107th Annual Meeting 2016; April 16-20, 2016; New Orleans, LA. American Association for Cancer Research, 2016. http://dx.doi.org/10.1158/1538-7445.am2016-4770.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.

Relatórios de organizações sobre o assunto "RNA Synthesis"

1

Soell, D. [The first steps of chlorophyll synthesis: RNA involvement and regulation]. Office of Scientific and Technical Information (OSTI), janeiro de 1992. http://dx.doi.org/10.2172/6528189.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
2

Nilsson, Emil. Synthesis of Sulfamoyl??Aminoacyl Adenylate Analogs for use in Protein?RNA Structure Determination. Portland State University Library, maio de 2013. http://dx.doi.org/10.15760/honors.28.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
3

Walker, Richard T. Synthesis of Nucleoside Analogues with Potential Antiviral Activity against Negative Strand RNA Virus Targets. Fort Belvoir, VA: Defense Technical Information Center, novembro de 1989. http://dx.doi.org/10.21236/ada229411.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
4

Soell, D. [The first steps of chlorophyll synthesis: RNA involvement and regulation]. Progress report, January 1990--June 1992. Office of Scientific and Technical Information (OSTI), dezembro de 1992. http://dx.doi.org/10.2172/10158546.

Texto completo da fonte
Estilos ABNT, Harvard, Vancouver, APA, etc.
5

Stern, David, e Gadi Schuster. Manipulating Chloroplast Gene Expression: A Genetic and Mechanistic Analysis of Processes that Control RNA Stability. United States Department of Agriculture, junho de 2004. http://dx.doi.org/10.32747/2004.7586541.bard.

Texto completo da fonte
Resumo:
New potential for engineering chloroplasts to express novel traits has stimulated research into relevant techniques and genetic processes, including plastid transformation and gene regulation. This BARD-funded research dealt with the mechanisms that influence chloroplast RNA accumulation, and thus gene expression. Previous work on cpRNA catabolism has elucidated a pathway initiated by endonucleolytic cleavage, followed by polyadenylation and exonucleolytic degradation. A major player in this process is the nucleus-encoded exoribo-nuclease/polymerase polynucleotide phosphorylase (PNPase). Biochemical characterization of PNPase has revealed a modular structure that controls its RNA synthesis and degradation activities, which in turn are responsive to the phosphate (P) concentration. During the funding period, new insights emerged into the molecular mechanism of RNA metabolism in the chloroplast and cyanobacteria, suggesting strategies for improving agriculturally-important plants or plants with novel introduced traits.
Estilos ABNT, Harvard, Vancouver, APA, etc.
6

Schuster, Gadi, e David Stern. Integration of phosphorus and chloroplast mRNA metabolism through regulated ribonucleases. United States Department of Agriculture, agosto de 2008. http://dx.doi.org/10.32747/2008.7695859.bard.

Texto completo da fonte
Resumo:
New potential for engineering chloroplasts to express novel traits has stimulated research into relevant techniques and genetic processes, including plastid transformation and gene regulation. This proposal continued our long time BARD-funded collaboration research into mechanisms that influence chloroplast RNA accumulation, and thus gene expression. Previous work on cpRNA catabolism has elucidated a pathway initiated by endonucleolytic cleavage, followed by polyadenylation and exonucleolytic degradation. A major player in this process is the nucleus-encoded exoribonuclease/polymerasepolynucleotidephoshorylase (PNPase). Biochemical characterization of PNPase has revealed a modular structure that controls its RNA synthesis and degradation activities, which in turn are responsive to the phosphate (P) concentration. However, the in vivo roles and regulation of these opposing activities are poorly understood. The objectives of this project were to define how PNPase is controlled by P and nucleotides, using in vitro assays; To make use of both null and site-directed mutations in the PNPgene to study why PNPase appears to be required for photosynthesis; and to analyze plants defective in P sensing for effects on chloroplast gene expression, to address one aspect of how adaptation is integrated throughout the organism. Our new data show that P deprivation reduces cpRNA decay rates in vivo in a PNPasedependent manner, suggesting that PNPase is part of an organismal P limitation response chain that includes the chloroplast. As an essential component of macromolecules, P availability often limits plant growth, and particularly impacts photosynthesis. Although plants have evolved sophisticated scavenging mechanisms these have yet to be exploited, hence P is the most important fertilizer input for crop plants. cpRNA metabolism was found to be regulated by P concentrations through a global sensing pathway in which PNPase is a central player. In addition several additional discoveries were revealed during the course of this research program. The human mitochondria PNPase was explored and a possible role in maintaining mitochondria homeostasis was outlined. As polyadenylation was found to be a common mechanism that is present in almost all organisms, the few examples of organisms that metabolize RNA with no polyadenylation were analyzed and described. Our experiment shaded new insights into how nutrient stress signals affect yield by influencing photosynthesis and other chloroplast processes, suggesting strategies for improving agriculturally-important plants or plants with novel introduced traits. Our studies illuminated the poorly understood linkage of chloroplast gene expression to environmental influences other than light quality and quantity. Finely, our finding significantly advanced the knowledge about polyadenylation of RNA, the evolution of this process and its function in different organisms including bacteria, archaea, chloroplasts, mitochondria and the eukaryotic cell. These new insights into chloroplast gene regulation will ultimately support plant improvement for agriculture
Estilos ABNT, Harvard, Vancouver, APA, etc.
7

Sionov, Edward, Nancy Keller e Shiri Barad-Kotler. Mechanisms governing the global regulation of mycotoxin production and pathogenicity by Penicillium expansum in postharvest fruits. United States Department of Agriculture, janeiro de 2017. http://dx.doi.org/10.32747/2017.7604292.bard.

Texto completo da fonte
Resumo:
The original objectives of the study, as defined in the approved proposal, are: To characterize the relationship of CreA and LaeA in regulation of P T production To understand how PacC modulates P. expansumpathogenicity on apples To examine if other secondary metabolites are involved in virulence or P. expansumfitness To identify the signaling pathways leading to PAT synthesis Penicilliumexpansum, the causal agent of blue mould rot, is a critical health concern because of the production of the mycotoxinpatulin (PAT) in colonized apple fruit tissue. Although PAT is produced by many Penicilliumspecies, the factors activating its biosynthesis were not clear. This research focused on host and fungal mechanisms of activation of LaeA (the global regulator of secondary metabolism), PacC (the global pH modulator) and CreA (the global carbon catabolite regulator) on PAT synthesis with intention to establish P. expansumas the model system for understanding mycotoxin synthesis in fruits. The overall goal of this proposal is to identify critical host and pathogen factors that mechanistically modulate P. expansumgenes and pathways to control activation of PAT production and virulence in host. Several fungal factors have been correlated with disease development in apples, including the production of PAT, acidification of apple tissue by the fungus, sugar content and the global regulator of secondary metabolism and development, LaeA. An increase in sucrose molarity in the culture medium from 15 to 175 mM negatively regulated laeAexpression and PAT accumulation, but, conversely, increased creAexpression, leading to the hypothesis that CreA could be involved in P. expansumPAT biosynthesis and virulence, possibly through the negative regulation of LaeA. We found evidence for CreAtranscriptional regulation of laeA, but this was not correlated with PAT production either in vitro or in vivo, thus suggesting that CreA regulation of PAT is independent of LaeA. Our finding that sucrose, a key ingredient of apple fruit, regulates PAT synthesis, probably through suppression of laeAexpression, suggests a potential interaction between CreA and LaeA, which may offer control therapies for future study. We have also identified that in addition to PAT gene cluster, CreA regulates other secondary metabolite clusters, including citrinin, andrastin, roquefortine and communesins, during pathogenesis or during normal fungal growth. Following creation of P. expansumpacCknockout strain, we investigated the involvement of the global pH regulator PacC in fungal pathogenicity. We demonstrated that disruption of the pH signaling transcription factor PacC significantly decreased the virulence of P. expansumon deciduous fruits. This phenotype is associated with an impairment in fungal growth, decreased accumulation of gluconic acid and reduced synthesis of pectolytic enzymes. We showed that glucose oxidase- encoding gene, which is essential for gluconic acid production and acidification during fruit colonization, was significantly down regulated in the ΔPepacCmutant, suggesting that gox is PacC- responsive gene. We have provided evidence that deletion of goxgene in P. expansumled to a reduction in virulence toward apple fruits, further indicating that GOX is a virulence factor of P. expansum, and its expression is regulated by PacC. It is also clear from the present data that PacC in P. expansumis a key factor for the biosynthesis of secondary metabolites, such as PAT. On the basis of RNA-sequencing (RNA-seq) analysis and physiological experimentation, the P. expansumΔlaeA, ΔcreAand ΔpacCmutants were unable to successfully colonize apples for a multitude of potential mechanisms including, on the pathogen side, a decreased ability to produce proteolytic enzymes and to acidify the environment and impaired carbon/nitrogen metabolism and, on the host side, an increase in the oxidative defence pathways. Our study defines these global regulatory factors and their downstream signalling pathways as promising targets for the development of strategies to fight against this post-harvest pathogen.
Estilos ABNT, Harvard, Vancouver, APA, etc.
8

Loebenstein, Gad, William Dawson e Abed Gera. Association of the IVR Gene with Virus Localization and Resistance. United States Department of Agriculture, agosto de 1995. http://dx.doi.org/10.32747/1995.7604922.bard.

Texto completo da fonte
Resumo:
We have reported that localization of TMV in tobacco cultivars with the N gene, is associated with a 23 K protein (IVR) that inhibited replication of several plant viruses. This protein was also found in induced resistant tissue of Nicotiana glutinosa x Nicotiana debneyi. During the present grant we found that TMV production is enhanced in protoplasts and plants of local lesion responding tobacco cultivars exposed to 35oC, parallel to an almost complete suppression of the production of IVR. We also found that IVR is associated with resistance mechanisms in pepper cultivars. We succeeded to clone the IVR gene. In the first attempt we isolated a clone - "101" which had a specific insert of 372 bp (the full length gene for the IVR protein of 23 kD should be around 700 bp). However, attempts to isolate the full length gene did not give clear cut results, and we decided not to continue with this clone. The amino acid sequence of the N-terminus of IVR was determined and an antiserum was prepared against a synthetic peptide representing amino acids residues 1-20 of IVR. Using this antiserum as well as our polyclonal antiserum to IVR a new clone NC-330 was isolated using lamba-ZAP library. This NC-330 clone has an insert of about 1 kB with an open reading frame of 596 bp. This clone had 86.6% homology with the first 15 amino acids of the N-terminal part of IVR and 61.6% homology with the first 23 amino acids of IVR. In the QIA expression system and western blotting of the expressed protein, a clear band of about 21 kD was obtained with IVR antiserum. This clone was used for transformation of Samsun tobacco plants and we have presently plantlets which were rooted on medium containing kanamycin. Hybridization with this clone was also obtained with RNA from induced resistant tissue of Samsun NN but not with RNA from healthy control tissue of Samsun NN, or infected or healthy tissue of Samsun. This further strengthens the previous data that the NC 330 clone codes for IVR. In the U.S. it was shown that IVR is induced in plants containing the N' gene when infected with mutants of TMV that elicit the HR. This is a defined system in which the elicitor is known to be due to permutations of the coat protein which can vary in elicitor strength. The objective was to understand how IVR synthesis is induced after recognition of elicitor coat protein in the signal transduction pathway that leads to HR. We developed systems to manipulate induction of IVR by modifying the elicitor and are using these elicitor molecules to isolate the corresponding plant receptor molecules. A "far-western" procedure was developed that found a protein from N' plants that specifically bind to elicitor coat proteins. This protein is being purified and sequenced. This objective has not been completed and is still in progress. We have reported that localization of TMV in tobacco cultivars with the N gene, is associated with a 23 K protein (IVR) that inhibited replication of several plant viruses. This protein was also found in induced resistant tissue of Nicotiana glutinosa x Nicotiana debneyi.
Estilos ABNT, Harvard, Vancouver, APA, etc.
9

Lapidot, Moshe, e Vitaly Citovsky. molecular mechanism for the Tomato yellow leaf curl virus resistance at the ty-5 locus. United States Department of Agriculture, janeiro de 2016. http://dx.doi.org/10.32747/2016.7604274.bard.

Texto completo da fonte
Resumo:
Tomato yellow leaf curl virus (TYLCV) is a major pathogen of tomato that causes extensive crop loss worldwide, including the US and Israel. Genetic resistance in the host plant is considered highly effective in the defense against viral infection in the field. Thus, the best way to reduce yield losses due to TYLCV is by breeding tomatoes resistant or tolerant to the virus. To date, only six major TYLCV-resistance loci, termed Ty-1 to Ty-6, have been characterized and mapped to the tomato genome. Among tomato TYLCV-resistant lines containing these loci, we have identified a major recessive quantitative trait locus (QTL) that was mapped to chromosome 4 and designated ty-5. Recently, we identified the gene responsible for the TYLCV resistance at the ty-5 locus as the tomato homolog of the gene encoding messenger RNA surveillance factor Pelota (Pelo). A single amino acid change in the protein is responsible for the resistant phenotype. Pelo is known to participate in the ribosome-recycling phase of protein biosynthesis. Our hypothesis was that the resistant allele of Pelo is a “loss-of-function” mutant, and inhibits or slows-down ribosome recycling. This will negatively affect viral (as well as host-plant) protein synthesis, which may result in slower infection progression. Hence we have proposed the following research objectives: Aim 1: The effect of Pelota on translation of TYLCV proteins: The goal of this objective is to test the effect Pelota may or may not have upon translation of TYLCV proteins following infection of a resistant host. Aim 2: Identify and characterize Pelota cellular localization and interaction with TYLCV proteins: The goal of this objective is to characterize the cellular localization of both Pelota alleles, the TYLCV-resistant and the susceptible allele, to see whether this localization changes following TYLCV infection, and to find out which TYLCV protein interacts with Pelota. Our results demonstrate that upon TYLCV-infection the resistant allele of pelota has a negative effect on viral replication and RNA transcription. It is also shown that pelota interacts with the viral C1 protein, which is the only viral protein essential for TYLCV replication. Following subcellular localization of C1 and Pelota it was found that both protein localize to the same subcellular compartments. This research is innovative and potentially transformative because the role of Peloin plant virus resistance is novel, and understanding its mechanism will lay the foundation for designing new antiviral protection strategies that target translation of viral proteins. BARD Report - Project 4953 Page 2
Estilos ABNT, Harvard, Vancouver, APA, etc.
10

Baudais, Virginie, Annelies Hickendorff, Jaïr van der Lijn, Igor Acko, Souleymane Maiga e Hussein Yusuf Ali. EU Military Training Missions: A Synthesis Report. Stockholm International Peace Research Institute, maio de 2022. http://dx.doi.org/10.55163/lfle9658.

Texto completo da fonte
Resumo:
This paper draws overarching conclusions based on a synthesis of previously published case studies that examined the impact of EU military training missions (EUTMs) in Somalia (EUTM Somalia, 2010–), Mali (EUTM Mali, 2013–), the Central African Republic (CAR) (EUTM RCA, 2016–). It concludes that EUTMs are relevant niche operations. Despite difficult circumstances beyond the control of the missions, EUTM training and advisory efforts have increased the effectiveness of partner armed forces. While these gains have been marginal in CAR and Somalia, they have been a bit more pronounced in Mali. Yet, broader security sector reform and defence sector reform efforts to improve the accountability and governance of defence and security sectors have become bogged down. The main challenge is that EUTMs are generally mandated to implement largely technical and tactical agendas in contexts where the ongoing armed conflict and the politics of the security sector are not conducive to building professional national security forces. As a consequence EUTMs find themselves caught up in interlinked and partially overlapping dilemmas. This study concludes with seven partly overlapping recommendations to EU member states and to EUTMs to address the main limitations that are restricting the impact of the missions.
Estilos ABNT, Harvard, Vancouver, APA, etc.
Você também pode estar interessado nas extensas listas de trabalhos sobre o assunto "RNA Synthesis":
Artigos de revistas Teses / dissertações Livros
Oferecemos descontos em todos os planos premium para autores cujas obras estão incluídas em seleções literárias temáticas. Contate-nos para obter um código promocional único!

Vá para a bibliografia