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The enediyne antitumor antibiotic C-1027 chromoprotein is produced by Streptomyces globisporus. The biosynthesis of the (S)-3-chloro-4,5-dihydroxy-beta-phenylalanine moiety (boxed) of the C-1027 chromophore (1) from l-tyrosine (3) and its incorporation into 1 are catalyzed by six enzymes: SgcC, SgcC1, SgcC2, SgcC3, SgcC4, ShcC5. In vivo and in vitro characterization of these enzymes delineated this pathway, unveiling a novel strategy for beta-amino acid modification featuring beta-amino acyl-S-carrier protein intermediates. These findings shed new light into beta-amino acid biosynthesis and present a new opportunity to engineer the C-1027 biosynthetic machinery for the production of novel analogues as exemplified by 20-deschloro-C-1027 (4), 20-deschro-22-deshydroxy-C-1027 (5), and 22-deshydroxy-C-1027 (6).

Biosynthesis of the beta-amino acid moiety of the enediyne antitumor antibiotic C-1027 featuring beta-amino acyl-S-carrier protein intermediates.