A chemical model for the activation of pyruvate-formate-lyase
摘要:
A chemical model is described for the activation of the carbon-centred radical-based enzyme, pyruvate-formate-lyase. The feasibility of a 5'-deoxyadenosyl radical abstracting a hydrogen atom from C-2 of a peptideglycine residue has been demonstrated in an intramolecular process.
Synthesis and neuroprotective activity of analogues of glycyl-l-prolyl-l-glutamic acid (GPE) modified at the α-carboxylic acid
摘要:
The synthesis of nine GPE* analogues, wherein the alpha-carboxylic acid group of glutamic acid has been modified, is described by coupling readily accessible N-benzyloxycarbonyl-glycyl-L-proline 2 with various analogues of glutamic acid. Pharmacological evaluation of the novel compounds was undertaken to further understand the role of the glutamate residue on the observed neuroprotective properties of the endogenous tripeptide GPE. (C) 2004 Elsevier Ltd. All rights reserved.
Copper-Catalyzed [3 + 2] Cycloaddition Reaction of <i>N</i>-Hydroxysuccinimide Ester with Isocyanoacetates for the Synthesis of 4,5-Disubstituted Oxazoles
The cycloaddition reaction of N-hydroxysuccinimide ester and isocyanatoacetate catalyzed by copper was described. A series of 4,5-disubstituted oxazole compounds, including ones derived from natural fatty acids, drugs, amino acids, and peptides, were obtained in moderate to high yields. The derivatization reaction was explored. The reaction mechanism was discussed.
The Study of Stability of Proline-Containing Derivatives of Dopamine and Serotonin in the Biological Media in Vitro Experiments
作者:K. V. Shevchenko、L. A. Andreeva、I. Yu. Nagaev、V. P. Shevchenko、N. F. Myasoedov
DOI:10.1134/s1990750820020110
日期:2020.4
The peptides Boc-Gly-Pro-DP, Z-Gly-Pro-DP, LA-Gly-Pro-DP, Boc-Gly-Pro-Srt, Z-Gly-Pro-Srt have been synthesized for the first time. The study of their stability in the presence of leucine aminopeptidase, carboxypeptidase Y, carboxypeptidase B, and proline endopeptidase (PEP) has shown that the synthesized peptides are stable in the presence of aminopeptidases and carboxypeptidases. In the presence of PEP, dopamine (DP) and serotonin (Srt) have been cleaved from these substances. Thus, the originally synthesized proline derivatives of Srt and DP may be considered as the resources, from which Srt and DP can be gradually released. This creates the possibility of a prolonged action of these biologically active compounds on cells and, consequently, on the whole body.
Guziec, Frank S.; Wasmund, Loide Mayer, Journal of Chemical Research, Miniprint, 1989, # 6, p. 1301 - 1353
作者:Guziec, Frank S.、Wasmund, Loide Mayer
DOI:——
日期:——
Chain reversals in model peptides: studies of cystine-containing cyclic peptides. 1. Conformational free energies of cyclization of hexapeptides of sequence Ac-Cys-X-Pro-Gly-Y-Cys-NHMe
作者:P. J. Milburn、Y. Konishi、Y. C. Meinwald、H. A. Scheraga
DOI:10.1021/ja00249a010
日期:1987.7
Synthesis and pharmacological evaluation of side chain modified glutamic acid analogues of the neuroprotective agent glycyl-l-prolyl-l-glutamic acid (GPE)
作者:Margaret A. Brimble、Nicholas S. Trotter、Paul W.R. Harris、Frank Sieg
DOI:10.1016/j.bmc.2004.10.006
日期:2005.1
The synthesis of eight GPE* analogues, wherein the gamma-carboxylic moiety of the glutamic residue has been modified, is described by coupling readily accessible N-benzyloxycarbonyl-glycyl-L-proline with various analogues of glutamic acid. Pharmacological evaluation of the novel compounds was undertaken to further understand the role of the glutamate residue on the observed neuroprotective properties of the endogenous tripeptide GPE. (C) 2004 Elsevier Ltd. All rights reserved.