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Antimicrobial Agents and Chemotherapy, November 2000, p. 3040-3048, Vol. 44, No. 11
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Identification of the Coumermycin A1 Biosynthetic Gene Cluster of Streptomyces rishiriensis DSM 40489

Zhao-Xin Wang, Shu-Ming Li, and Lutz Heide*

Pharmazeutische Biologie, Pharmazeutisches Institut, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany

Received 24 April 2000/Returned for modification 10 July 2000/Accepted 10 August 2000

The biosynthetic gene cluster of the aminocoumarin antibiotic coumermycin A1 was cloned by screening of a cosmid library of Streptomyces rishiriensis DSM 40489 with heterologous probes from a dTDP-glucose 4,6-dehydratase gene, involved in deoxysugar biosynthesis, and from the aminocoumarin resistance gyrase gene gyrBr. Sequence analysis of a 30.8-kb region upstream of gyrBr revealed the presence of 28 complete open reading frames (ORFs). Fifteen of the identified ORFs showed, on average, 84% identity to corresponding ORFs in the biosynthetic gene cluster of novobiocin, another aminocoumarin antibiotic. Possible functions of 17 ORFs in the biosynthesis of coumermycin A1 could be assigned by comparison with sequences in GenBank. Experimental proof for the function of the identified gene cluster was provided by an insertional gene inactivation experiment, which resulted in an abolishment of coumermycin A1 production.

* Corresponding author. Mailing address: Pharmazeutische Biologie, Pharmazeutisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany. Phone: 49-7071-29-72460. Fax: 49-7071-29-5250. E-mail: heide{at}uni-tuebingen.de.

Antimicrobial Agents and Chemotherapy, November 2000, p. 3040-3048, Vol. 44, No. 11
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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