Abstract
ABSTRACT Streptomyces ambofaciens synthesizes the macrolide antibiotic spiramycin. The biosynthetic gene cluster for spiramycin has been characterized for S. ambofaciens. In addition to the regulatory gene srmR ( srm22 ), previously identified (M. Geistlich et al., Mol. Microbiol. 6:2019-2029, 1992), three putative regulatory genes had been identified by sequence analysis. Gene expression analysis and gene inactivation experiments showed that only one of these three genes, srm40 , plays a major role in the regulation of spiramycin biosynthesis. The disruption of srm22 or srm40 eliminated spiramycin production while their overexpression increased spiramycin production. Expression analysis was performed by reverse transcription-PCR (RT-PCR) for all the genes of the cluster in the wild-type strain and in the srm22 ( srmR ) and srm40 deletion mutants. The results from the expression analysis, together with the ones from the complementation experiments, indicated that Srm22 is required for srm40 expression, Srm40 being a pathway-specific activator that controls most, if not all, of the spiramycin biosynthetic genes.
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Dates
Type | When |
---|---|
Created | 14 years, 11 months ago (Sept. 3, 2010, 10:13 p.m.) |
Deposited | 4 years ago (July 29, 2021, 1:14 p.m.) |
Indexed | 3 weeks ago (Aug. 7, 2025, 4:58 a.m.) |
Issued | 14 years, 9 months ago (Nov. 1, 2010) |
Published | 14 years, 9 months ago (Nov. 1, 2010) |
Published Print | 14 years, 9 months ago (Nov. 1, 2010) |
@article{Karray_2010, title={Regulation of the Biosynthesis of the Macrolide Antibiotic Spiramycin in Streptomyces ambofaciens}, volume={192}, ISSN={1098-5530}, url={http://dx.doi.org/10.1128/jb.00712-10}, DOI={10.1128/jb.00712-10}, number={21}, journal={Journal of Bacteriology}, publisher={American Society for Microbiology}, author={Karray, Fatma and Darbon, Emmanuelle and Nguyen, Hoang Chuong and Gagnat, Josette and Pernodet, Jean-Luc}, year={2010}, month=nov, pages={5813–5821} }