An alkaline D-stereospecific endopeptidase with beta-lactamase activity from Bacillus cereus.

The Journal of Biological Chemistry
Y AsanoY Kato

Abstract

We purified a novel extracellular D-stereospecific endopeptidase, alkaline D-peptidase (D-stereospecific peptide hydrolase, EC 3.4.11.-), to homogeneity from the culture broth of the soil bacterium Bacillus cereus strain DF4-B. The Mr of the enzyme was 37,952, and it was composed of a single polypeptide chain. The optimal pH for activity was approximately 10.3. The enzyme was strictly D-stereospecific toward oligopeptides composed of Dphenylalanine such as (D-Phe)3 and (D-Phe)4. The enzyme also acted to a lesser extent on (D-Phe)6, Boc-(D-Phe)4 (where Boc is tert-butoxycarbonyl), Boc-(D-Phe)4 methyl ester, Boc-(D-Phe)3 methyl ester, Boc-(D-Phe)2, (D-Phe)2, and others, but not upon their corresponding peptides composed of L-Phe, (D-Ala)n (n = 2-5), (D-Val)3, and (D-Leu)2. The mode of action of the enzyme was clarified with synthetic substrates ((D-Phe)2-D-Tyr and D-Tyr-(D-Phe)2) and eight stereoisomers of (Phe)3. The enzyme had beta-lactamase activity toward ampicillin and penicillin G, although carboxypeptidase DD and D-aminopeptidase activities were undetectable. The gene coding for alkaline D-peptidase (adp) was cloned into plasmid pUC118, and a 1164-base pair open reading frame consisting of 388 codons was identified as the ...Continue Reading

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Citations

Oct 19, 2005·Archives of Microbiology·Francisco LeganésC Peter Wolk
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