1887

Abstract

The biosynthetic gene cluster of the aminocoumarin antibiotic clorobiocin was cloned by screening of a cosmid library of DS 12.976 with two heterologous probes from the novobiocin biosynthetic gene cluster. Sequence analysis revealed 27 ORFs with striking similarity to the biosynthetic gene clusters of novobiocin and coumermycin A. Inactivation of a putative aldolase gene, , by in-frame deletion led to the abolishment of the production of clorobiocin. Feeding of the mutant with 3-dimethylallyl-4-hydroxybenzoic acid (Ring A of clorobiocin) restored clorobiocin production. Here, it is suggested that the formation of Ring A of clorobiocin may proceed via a retro-aldol reaction catalysed by CloR, i.e. by a mechanism different from the previously elucidated benzoic acid biosynthetic pathway in . A comparison of the gene clusters for clorobiocin, novobiocin and coumermycin A showed that the structural differences between the three antibiotics were reflected remarkably well by differences in the organization of their respective biosynthetic gene clusters.

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2002-12-01
2019-10-13
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