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Updated: Jun 14, 2026

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
Published on: May 4, 2018
Beta-alanyl peptide synthesis by Streptomyces S9 aminopeptidase
Jiro Arima1, Masazumi Morimoto, Hirokazu Usuki
1Department of Agricultural, Biological, and Environmental Sciences, Faculty of Agriculture, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan. arima@muses.tottori-u.ac.jp
Abstract:
Synthesis of beta-alanine (beta-Ala) containing dipeptide using S9 aminopeptidase from Streptomyces thermocyaneoviolaceus NBRC14271 (S9AP-St) was demonstrated with beta-Ala-benzyl ester (-OBzl) and various L-aminoacyl derivatives. For synthesis of beta-Ala-containing dipeptide, beta-Ala-OBzl was used preferentially as the acyl donor for S9AP-St, producing synthesized dipeptides having beta-Ala-Xaa structure. In contrast, engineering of S9AP-St into "transaminopeptidase" by substitution of catalytic Ser with Cys--designated as aminolysin-S--produced only dipeptides having Xaa-beta-Ala structure. Investigation of the specificity of S9AP-St toward acyl acceptors showed that S9AP has a broad substrate specificity toward various aminoacyl derivatives. Furthermore, S9AP-St produced carnosine methyl ester (-OMe) with a conversion ratio of beta-Ala-OBzl to carnosine-OMe that was greater than 30%.
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