Готові списки джерел за темами / Guanidinium groups

Добірка наукової літератури з теми "Guanidinium groups"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Guanidinium groups"

Malinska, Maura, Miroslawa Dauter, and Zbigniew Dauter. "Geometry of guanidinium groups in arginines." Protein Science 25, no. 9 (July 4, 2016): 1753–56. http://dx.doi.org/10.1002/pro.2970.

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Galukhin, Andrey, Ilnaz Imatdinov, and Yuri Osin. "p-tert-Butylthiacalix[4]arenes equipped with guanidinium fragments: aggregation, cytotoxicity, and DNA binding abilities." RSC Advances 6, no. 39 (2016): 32722–26. http://dx.doi.org/10.1039/c6ra04733e.

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Thiacalix[4]arenes in 1,3-alternate conformation functionalized with guanidinium groups showed a strong dependence of the aggregation properties with the ratio of guanidinium/n-decyl fragments attached to phenolic groups.

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Balos, V., M. Bonn, and J. Hunger. "Quantifying transient interactions between amide groups and the guanidinium cation." Physical Chemistry Chemical Physics 17, no. 43 (2015): 28539–43. http://dx.doi.org/10.1039/c5cp04619j.

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Szabo, Jan, and Gerhard Maas. "Derivatives of the triaminoguanidinium ion, 4. O-Sulfonylation of N,N′,N″-tris(hydroxybenzylidenamino)guanidinium ions." Zeitschrift für Naturforschung B 71, no. 6 (June 1, 2016): 697–703. http://dx.doi.org/10.1515/znb-2016-0035.

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AbstractAll hydroxy groups of the N,N′,N″-tris(4-hydroxybenzylidenamino)guanidinium and N,N′,N″-tris(2,4-dihydroxybenzylidenamino)guanidinium ions could be sulfonylated in good yields to obtain three-fold or six-fold substituted and functionalized derivatives. The 2,4-dihydroxyphenyl containing precursors have been used to construct branched three-armed guanidinium derivatives bearing six dansyl or anthraquinone moieties.

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Hanke, Marcel, Niklas Hansen, Emilia Tomm, Guido Grundmeier, and Adrian Keller. "Time-Dependent DNA Origami Denaturation by Guanidinium Chloride, Guanidinium Sulfate, and Guanidinium Thiocyanate." International Journal of Molecular Sciences 23, no. 15 (August 1, 2022): 8547. http://dx.doi.org/10.3390/ijms23158547.

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Guanidinium (Gdm) undergoes interactions with both hydrophilic and hydrophobic groups and, thus, is a highly potent denaturant of biomolecular structure. However, our molecular understanding of the interaction of Gdm with proteins and DNA is still rather limited. Here, we investigated the denaturation of DNA origami nanostructures by three Gdm salts, i.e., guanidinium chloride (GdmCl), guanidinium sulfate (Gdm2SO4), and guanidinium thiocyanate (GdmSCN), at different temperatures and in dependence of incubation time. Using DNA origami nanostructures as sensors that translate small molecular transitions into nanostructural changes, the denaturing effects of the Gdm salts were directly visualized by atomic force microscopy. GdmSCN was the most potent DNA denaturant, which caused complete DNA origami denaturation at 50 °C already at a concentration of 2 M. Under such harsh conditions, denaturation occurred within the first 15 min of Gdm exposure, whereas much slower kinetics were observed for the more weakly denaturing salt Gdm2SO4 at 25 °C. Lastly, we observed a novel non-monotonous temperature dependence of DNA origami denaturation in Gdm2SO4 with the fraction of intact nanostructures having an intermediate minimum at about 40 °C. Our results, thus, provide further insights into the highly complex Gdm–DNA interaction and underscore the importance of the counteranion species.

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Matulková, Irena, Jan Fábry, Václav Eigner, Michal Dušek, Jan Kroupa, and Ivan Němec. "Isostructural Crystals of Bis(Guanidinium) Trioxofluoro-Phosphate/Phosphite in the Ratio 1/0, 0.716/0.284, 0.501/0.499, 0.268/0.732, 0/1—Crystal Structures, Vibrational Spectra and Second Harmonic Generation." Crystals 12, no. 12 (November 23, 2022): 1694. http://dx.doi.org/10.3390/cryst12121694.

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The title structures of bis(guanidinium) trioxofluorophosphate, bis(guanidinium) trioxofluorophosphate-phosphite (0.716/0.284), bis(guanidinium) trioxofluorophosphate-phosphite (0.501/0.499), bis(guanidinium) trioxofluorophosphate-phosphite (0.268/0.732), and bis(guanidinium) phosphite are crystal-chemically isotypic. Their structures correspond to the structure of bis(guanidinium) trioxofluorophosphate which was determined by Prescott, Troyanov, Feist & Kemnitz (Z. Anorg. Allg. Chem. 2002, 628, 1749–1755). The P and O atoms of the substituted trioxofluorophosphate and phosphite anions share the same positions while the P-F and P-Hhydrido are almost parallel and oriented in the same direction. Two symmetry-independent anions and two of three symmetry-independent cations are situated on the crystallographic mirror planes. The ions are interconnected by N-H⋯O hydrogen bonds of moderate strength. The most frequent graph set motif is R22(8), which involves interactions between the primary amine groups and the trioxofluorophosphate or phosphite O atoms. Fluorine, as well as the hydrido hydrogen, avoids inclusion into the hydrogen-bond network. The Hirshfeld surface analysis was also performed for the comparison of intermolecular interactions in the title structures of bis(guanidinium trioxofluorophosphate and bis(guanidinium) phosphite. The title crystals were also characterized by vibrational spectroscopy methods (FTIR and FT Raman) and the second harmonic generation (SHG). The relative SHG efficiency considerably decreases from bis(guanidinium) trioxofluorophosphate to bis(guanidinium) phosphite for the fundamental 1064 nm laser line.

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Balos, V., M. Bonn, and J. Hunger. "Correction: Quantifying transient interactions between amide groups and the guanidinium cation." Physical Chemistry Chemical Physics 18, no. 2 (2016): 1346–47. http://dx.doi.org/10.1039/c5cp90226f.

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Cui, Yu Fang, Jin Yan Du, Yu Ming Shang, Yao Wu Wang, Jin Hai Wang, Ya Fei Lv, and Shu Bo Wang. "Novel Anion Exchange Membranes from Poly(aryl ether)s with Quaternary Guanidinium Groups." Advanced Materials Research 560-561 (August 2012): 864–68. http://dx.doi.org/10.4028/www.scientific.net/amr.560-561.864.

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A series of fluorinated poly(aryl ether oxadiazole)s (FPEO) were synthesized and brominated with N-bromosuccinmide (NBS) which were then functionalized with quaternary guanidinium to get fluorinated anion exchange membranes （AEM）with pendant quaternary guanidinium Groups. The structure of resulting polymers was characterized by FTIR spectroscopy. The properties of the obtained membranes were investigated in terms of ion exchange capacity (IEC), swelling ratio, area resistance and vanadium permeability. The results showed that the novel anion exchange membranes possess much higher selectivity in VRB system. The permeation rate of vanadium ions of GFPEO is 0.21×10-7 cm2min-1 which is much lower compared with that of Nafion.

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Du, Shanshan, Yang Li, Zhilong Chai, Weiguo Shi, and Junlin He. "Site-specific functionalization with amino, guanidinium, and imidazolyl groups enabling the activation of 10–23 DNAzyme." RSC Advances 10, no. 32 (2020): 19067–75. http://dx.doi.org/10.1039/d0ra02226h.

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Tiritiris, Ioannis. "N,N,N′,N′,N′′-Pentamethyl-N′′-[3-(trimethylazaniumyl)propyl]guanidinium bis(tetraphenylborate)." Acta Crystallographica Section E Structure Reports Online 69, no. 2 (January 26, 2013): o292. http://dx.doi.org/10.1107/s1600536813001992.

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In the crystal structure of the title salt, C12H30N42+·2C24H20B−, the C—N bond lengths in the central CN3unit of the guanidinium ion are 1.3388 (17), 1.3390 (16) and 1.3540 (17) Å, indicating partial double-bond character in each. The central C atom is bonded to the three N atoms in a nearly ideal trigonal-planar geometry and the positive charge is delocalized in the CN3plane. The bonds between the N atoms and the terminalC-methyl groups of the guanidinium moiety, all have values close to a typical single bond [1.4630 (16)–1.4697 (17) Å]. C—H...π interactions are present between the guanidinium H atoms and the phenyl C atoms of one tetraphenylborate ion. The phenyl rings form a kind of aromatic pocket, in which the guanidinium ion is embedded.

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Більше джерел

Дисертації з теми "Guanidinium groups"

Kiran, Amritanjali. "Understanding the role of arginine clusters in β-hairpin antimicrobial peptides". Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5106.

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The work described in this thesis describes the role of arginine clusters and the importance of their position in B-hairpin antimicrobial peptides. Here, we have tried to explore the role of guanidinium groups in the studied model system Polyphemeusin-1. The thesis has been divided into four chapters. The first chapter includes the challenges associated with the antimicrobial resistance, the literature available for antimicrobial peptides and a broad view of their history, diversity, physiochemical properties and the mechanism of actions of antimicrobial peptides. From this chapter we can infer the fact the antimicrobial peptides are an important part of innate immune system and show broad spectrum activity proving them as a potential candidate for developing into therapeutics. Later, in the second chapter we have described the background study which was done to understand the arginine cluster, how we chose the model system for our study and the literature available for the model peptide Polyphemusin-1. In this chapter, we observed that all -hairpin antimicrobial peptides contain cysteine disulfide bridge. Also, all the peptides analysed showed a pattern of arginine clusters in terminal region, strand region and turn region from which we delineated our objective. In the third Chapter we have detailed all the experiments, which were performed to carry out this project. The last chapter includes the results and discussion section wherein, we have described all the detailed analysis of the experiments performed and results obtained while trying to understand the role of arginine and its position for overall potency and activity of the peptide. From this chapter we could conclude the fact that arginine in the terminal clusters plays a key role in antimicrobial activity of Polyphemusin-1 and removal of guanidinium group leads to compromise in its antimicrobial activity without compromising its interaction with the membrane. However, the peptides showed structural difference at different pH and increased structural rigidity in hydrophobic niche for which further experiments needs to be done. Summary and Outlook The arginine clusters in β-hairpin peptides play an important role for the poteny of peptides. The mutation of arginine to ornithine in which the guanidine group was lost led to compromise upon the antimicrobial activity of the Polyphemusin specially the removal of guanidinium group left the peptide with no antimicrobial activity. However, the loss of guanidinium group did not showed any major effect upon the membrane damage and membrane depolarization concluding the fact that the first interaction of the peptides with membrane is not getting affected possibly because the Polyphemusin has some internal targets which still needs to be explored.

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Частини книг з теми "Guanidinium groups"

Schmidtchen, Franz P., Michael Berger, Axel Metzger, Karsten Gloe, and Holger Stephan. "Foldable Anion Hosts Based on Bicyclic Guanidinium Anchor Groups." In Molecular Design and Bioorganic Catalysis, 191–210. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1679-1_10.

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Engelhard, M., S. Finkler, G. Metz, and F. Siebert. "Proton exchange of the guanidinium group in bacteriorhodopsin." In Peptides, 297–98. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2264-1_107.

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Hannon, Christine L., and Eric V. Anslyn. "The Guanidinium Group: Its Biological Role and Synthetic Analogs." In Bioorganic Chemistry Frontiers, 193–255. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78110-0_6.

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Aggarwal, V. K., E. M. McGarrigle, and M. A. Shaw. "Aziridination with Guanidinium Ylides." In Stereoselective Reactions of Carbonyl and Imino Groups, 1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-202-00144.

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Lambert, Tristan H. "Functional Group Reduction." In Organic Synthesis. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190200794.003.0010.

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The reduction of azobenzene 1 with catalyst 2 was reported (J. Am. Chem. Soc. 2012, 134, 11330) by Alexander T. Radosevich at Pennsylvania State University, representing a unique example of a nontransition metal-based two-electron redox catalysis platform. Wolfgang Kroutil at the University of Graz found (Angew. Chem. Int. Ed. 2012, 51, 6713) that diketone 4 was converted to piperidinium 5 with very high stereoselectivity using a transaminase followed by reduction over Pd/C. Dennis P. Curran at the University of Pittsburgh reported (Org. Lett. 2012, 14, 4540) that NHC-borane 7 is a convenient reducing agent for aldehydes and ketones, showing selectivity for the former as in the monoreduction of 6 to 8. A catalytic reduction of esters to ethers with Fe3(CO)12 and TMDS, as in the conversion of 9 to 10, was developed (Chem. Commun. 2012, 48, 10742) by Matthias Beller at the Leibniz-Institute for Catalysis. Meanwhile, iridium catalysis was used (Angew. Chem. Int. Ed. 2012, 51, 9422) by Maurice Brookhart at the University of North Carolina at Chapel Hill for the reduction of esters to aldehydes with diethylsilane (e.g., 11 to 12). As an impressive example of selective reduction, Ohyun Kwon at UCLA reported (Org. Lett. 2012, 14, 4634) the conversion of ester 13 to aldehyde 14, leaving the malonate moiety intact. The cobalt complex 16 was found (Angew. Chem. Int. Ed. 2012, 51, 12102) by Susan K. Hanson at Los Alamos National Laboratory to be an effective catalyst for C=O, C=N, and C=C bond hydrogenation, including the conversion of alkene 15 to 17. The use of frustrated Lewis pair catalysis for the low-temperature hydrogenation of alkenes such as 18 was developed (Angew. Chem. Int. Ed. 2012, 51, 10164) by Stefan Grimme at the University of Bonn and Jan Paradies the Karlsruhe Institute of Technology. Guanidinium nitrate was found (Chem. Commun. 2012, 48, 6583) by Kandikere Ramaiah Prabhu at the Indian Institute of Science to catalyze the hydrazine-based reduction of alkenes such as 20. The hydrogenation of thiophenes is difficult for a number of reasons, but now Frank Glorius at the University of Münster has developed (J. Am. Chem. Soc. 2012, 134, 15241) an effective system for the highly enantioselective catalytic hydrogenation of thiophenes and benzothiophenes, including 22.

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