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J. Bacteriol., Oct 1997, 6271-6278, Vol 179, No. 20
Copyright © 1997, American Society for Microbiology

Cloning of an avilamycin biosynthetic gene cluster from Streptomyces viridochromogenes Tu57

S Gaisser, A Trefzer, S Stockert, A Kirschning and A Bechthold
Pharmazeutisches Institut, Pharmazeutische Biologie, Universitat Tubingen, Germany.

A 65-kb region of DNA from Streptomyces viridochromogenes Tu57, containing genes encoding proteins involved in the biosynthesis of avilamycins, was isolated. The DNA sequence of a 6.4-kb fragment from this region revealed four open reading frames (ORF1 to ORF4), three of which are fully contained within the sequenced fragment. The deduced amino acid sequence of AviM, encoded by ORF2, shows 37% identity to a 6- methylsalicylic acid synthase from Penicillium patulum. Cultures of S. lividans TK24 and S. coelicolor CH999 containing plasmids with ORF2 on a 5.5-kb PstI fragment were able to produce orsellinic acid, an unreduced version of 6-methylsalicylic acid. The amino acid sequence encoded by ORF3 (AviD) is 62% identical to that of StrD, a dTDP-glucose synthase from S. griseus. The deduced amino acid sequence of AviE, encoded by ORF4, shows 55% identity to a dTDP-glucose dehydratase (StrE) from S. griseus. Gene insertional inactivation experiments of aviE abolished avilamycin production, indicating the involvement of aviE in the biosynthesis of avilamycins.

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