Abstract

The tripeptide δ-( L -carboxymethylcysteinyl)- L -cysteinyl- D -valine ( L -CMC-CV) is converted sequentially into the CMC analog of isopenicillin N, the CMC analog of penicillin N, and the CMC analog of desacetoxycephalosporin C by, respectively, isopencillin N synthetase, isopenicillin N epimerase, and desacetoxycephalosporin C synthetase, all isolated from the beta-lactam producing prokaryote Streptomyces clavuligerus .

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