1887

Abstract

During analysis of the recently identified gene cluster for the glycopeptide antibiotic balhimycin, produced by DSM 5908, novel genes were identified and characterized in detail. The gene products of four of the identified genes (, , and ) are nonribosomal peptide synthetases (NRPSs); one (Orf1-protein) shows similarities to small proteins associated with several NRPSs without an assigned function. BpsA and BpsB are composed of three modules each (modules 1–6), BpsC of one module (module 7) and BpsD of a minimal module (module 8). Thus, the balhimycin gene cluster encodes eight modules, whereas its biosynthetic product is a heptapeptide. Non-producing mutants were created by a gene disruption of , an in-frame deletion of and a gene replacement of . After establishment of a gene complementation system for strains, the replacement mutant of was complemented, demonstrating for the first time that BpsD, encoding the eighth module, is indeed involved in balhimycin biosynthesis. After feeding with β-hydroxytyrosine the capability of the mutant to produce balhimycin was restored, demonstrating the participation of BpsD in the biosynthesis of this amino acid. The specificity of four of the eight adenylation domains was determined by ATP/PP exchange assays: modules 4 and 5 activated L-4-hydroxyphenylglycine, module 6 activated β-hydroxytyrosine and module 7 activated L-3,5-dihydroxyphenylglycine, which is in accordance with the sequence of the non-proteogenic amino acids 4 to 7 of the balhimycin backbone.

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2002-04-01
2021-10-23
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