Native and Modified Subtilisin 72 as a Catalyst for Peptide Synthesis in Media with a Low Water Content |
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Authors: | Bacheva A V Baibak O V Belyaeva A V Lysogorskaya E N Oksenoit E S Lozinskii V I Filippova I Yu |
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Institution: | (1) Faculty of Chemistry, Moscow State University, Vorob'evy gory, Moscow, 119992, Russia;(2) Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 117813, Russia |
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Abstract: | The catalytic efficiencies of native subtilisin, its noncovalent complex with polyacrylic acid, and the subtilisin covalently immobilized in a cryogel of polyvinyl alcohol were studied in the reaction of peptide coupling in mixtures of organic solvents with a low water content in dependence on the medium composition, reaction time, and biocatalyst concentration. It was established that, in media with a DMF content >80%, the synthase activity of modified subtilisins is higher than that of the native subtilisin. The use of N-acylpeptides with a free carboxyl group was found to be possible in organic solvents during the enzymatic synthesis catalyzed by both native and immobilized subtilisin. A series of tetrapeptide p-nitroanilides of the general formula Z-Ala-Ala-Xaa-Yaa-pNA (where Xaa is Leu, Lys, or Glu and Yaa is Phe or Asp) was obtained in the presence of immobilized enzyme in yields of 70–98% in DMF–MeCN without any activation of the carboxyl component and without protection of side ionogenic groups of polyfunctional amino acids. |
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Keywords: | enzymatic peptide synthesis in organic solvents immobilized subtilisin subtilisin– polyacrylic acid complex subtilisin– polyvinyl alcohol cryogel complex |
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