Cross-Linked Crystals of Subtilisin: Versatile Catalyst for Organic Synthesis
摘要:
Cross-linked enzyme crystals (CLECs) of subtilisin exhibit excellent activity in aqueous and various organic solvents. This catalyst is more stable than the native enzyme in both aqueous and mixed aqueous/organic solutions. Subtilisin-CLEC was shown to be a versatile catalyst. It was used for the syntheses of peptides and peptidomimetics, mild hydrolysis of amino acid and peptide amides, enantio- and regioselective reactions, and transesterifications.
AbstractImmobilized Aspergillus oryzae protease (AOP) catalyzed the formation of peptide bonds between TV‐protected amino acids and amino acid esters or amides in ethyl acetate. The influences of pH and reaction time on the coupling of Boc‐L‐Tyr and Gly‐NH2 were studied. The optimal reaction condition for this enzyme catalyzed synthesis of Boc‐L‐Phe‐Gly‐NH2 (98.66%) was at pH 5.5 and a duration of 48 hours.
Methyltrypsin-Catalyzed Peptide Coupling: Comparison of Alkyl Ester and Guanidinophenyl Ester Derivatives as Acyl Donor Component
Methyltrypsin-catalyzed peptide synthesis has been studied by using conventional alkyl ester and p-guanidinophenyl ester derivatives of alpha-amino acid as the acyl donor component. They were found to be coupled with alpha-amino acid derivatives (acyl acceptor component) to produce dipeptide. The behavior of methyltrypsin toward both the substrates has been studied. (C) 1997 Academic Press.
New biocatalysts for peptide synthesis :Gels of copolymerized acrylic derivatives of α-chymotrypsin and polyoxyethylene