Enzymatic synthesis of activated esters and their subsequent use in enzyme-based peptide synthesis
摘要:
Chemoenzymatic peptide synthesis is potentially the most cost-efficient technology for the synthesis of short and medium-sized peptides. However, there are still some limitations when challenging peptides, e.g. containing sterically demanding acyl donors, non-proteinogenic amino acids or proline residues, are to be synthesized. To remedy these limitations, special ester moieties have been used that are specifically recognized by the enzyme, e.g. guanidinophenyl, carboxamidomethyl (Cam) or trifluoroethyl (Tfe) esters, which, unfortunately, are notoriously difficult to synthesize chemically. Herein, we demonstrate that Cam and Tfe esters are very useful for Alcalase-CLEA mediated peptide synthesis using sterically demanding and non-proteinogenic acyl donors as well as poor nucleophiles, and combinations thereof. Furthermore, these esters can be efficiently synthesized by using the lipase Cal-B or Alcalase-CLEA. Finally, it is shown that the ester synthesis by Cal-B and subsequent peptide synthesis by Alcalase-CLEA can be performed simultaneously using a two-enzyme-one-pot approach with glycolamide or 2,2,2-trifluoroethanol as additive. (C) 2011 Elsevier B.V. All rights reserved.
This invention relates to novel arginine aldehydes, their salts and hydrates, which compounds selectively exhibit serine proteases inhibitory activity, are highly stable in aqueous solutions, and are useful for anti-trypsin and anti-thrombin activity.
Process for preparing oxazolo\x9b3,2-a!pyrrolo\x9b2,1-c!pyrazine derivatives \n'
申请人:Sandoz Ltd.
公开号:US04145549A1
公开(公告)日:1979-03-20
The present invention provides a novel cyclization process useful for the production of the peptide moiety of an ergotalkaloid.
本发明提供了一种新的环化过程,用于生产麦角生物碱的肽基团。
Proline derivatives
申请人:ICI AMERICAS INC.
公开号:EP0124317A2
公开(公告)日:1984-11-07
Proline derivatives of the formulae:
wherein R1 through R11 have defined values, and acid- and base-addition salts thereof, and equilibrium addition compounds of the aldehyde group thereof; processes for their preparation; pharmaceutical compositions; and intermediates for preparing said proline derivatives. The proline derivatives are human leukocyte elastase inhibitors which are useful, for example, in treating pulmonary emphysema.