title: Synthesis of peptide aldehydes via enzymatic acylation of amino aldehyde derivatives.
abstract: Two ways for semi-enzymatic preparation of the peptide aldehydes are proposed: (1) enzymatic acylation of amino alcohols with acyl peptide esters and subsequent chemical oxidation of the resulting peptide alcohols with DMSO/acetic anhydride mixture or (2) enzymatic acylation of the preliminarily obtained by a chemical route amino aldehyde semicarbazones. Subtilisin 72, serine proteinase with a broad specificity, distributed over macroporous silica, was used as a catalyst in both cases. Due to the practical absence of water in the reaction mixtures the yields of the products in both enzymatic reactions were nearly quantitative. The second way seems to be more attractive because all chemical stages were carried out with amino acid derivatives, far less valuable compounds than peptide ones. A series of peptide aldehydes of general formula Z-Ala-Ala-Xaa-al (where Xaa-al = leucinal, phenylalaninal, alaninal, valinal) was obtained. The inhibition parameters for these compounds, in the hydrolysis reactions of corresponding chromogenic substrates for subtilisin and alpha-chymotrypsin, were determined.
authors.affiliation: V.M. Stepanov's Laboratory of Protein Chemistry, Institute of Genetics and Selection of Industrial Microorganisms, Moscow, Russia. ost@vnigen.msk.su
authors.forename: T L
authors.initials: TL
authors.lastname: Voyushina
authors.forename: J V
authors.initials: JV
authors.lastname: Potetinova
authors.forename: E I
authors.initials: EI
authors.lastname: Milgotina
authors.forename: V M
authors.initials: VM
authors.lastname: Stepanov
mesh_terms: D000215:Acylation; D000447:Aldehydes / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002863:Chromogenic Compounds; D002918:Chymotrypsin / Q000037:antagonists & inhibitors; D004791:Enzyme Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship; D013381:Subtilisins / Q000037:antagonists & inhibitors
chemical_list: D000447:Aldehydes; D002863:Chromogenic Compounds; D004791:Enzyme Inhibitors; D009842:Oligopeptides; D013381:Subtilisins; D002918:Chymotrypsin; C117608:alpha-chymotrypsin