Proline–Glutamate Chimeras in Isopeptides. Synthesis and Biological Evaluation of Conformationally Restricted Glutathione Analogues
摘要:
The two novel diastereoisomeric glutathione analogues I and 2 have been designed and synthesized by replacing the native gamma-glutamylic moiety with the conformational rigid skeleton of cis- or trans-4-carboxy-L-proline residue. Both analogues have been obtained by following the solution phase peptide chemistry methodologies and final reduction of the corresponding disulfide forms 13 and 14. The two analogues 1 and 2 have been tested towards gamma-glutamyltranspeptidase (gamma-GT) and human glutathione S-transferase (hGST P1-1). Both analogues 1 and 2 are completely resistant to enzymatic degradation by gamma-GT. The S-transferase utilizes the analogue 2 as a good substrate while is unable to bind the analogue 1. (C) 2003 Elsevier Science Ltd. All rights reserved.
Proline–Glutamate Chimeras in Isopeptides. Synthesis and Biological Evaluation of Conformationally Restricted Glutathione Analogues
摘要:
The two novel diastereoisomeric glutathione analogues I and 2 have been designed and synthesized by replacing the native gamma-glutamylic moiety with the conformational rigid skeleton of cis- or trans-4-carboxy-L-proline residue. Both analogues have been obtained by following the solution phase peptide chemistry methodologies and final reduction of the corresponding disulfide forms 13 and 14. The two analogues 1 and 2 have been tested towards gamma-glutamyltranspeptidase (gamma-GT) and human glutathione S-transferase (hGST P1-1). Both analogues 1 and 2 are completely resistant to enzymatic degradation by gamma-GT. The S-transferase utilizes the analogue 2 as a good substrate while is unable to bind the analogue 1. (C) 2003 Elsevier Science Ltd. All rights reserved.