A Possible Extended Family of Regulators of Sigma Factor Activity in Streptomyces Coelicolor

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 2008 Sep 16

PMID 18790871

Citations 18

Authors

Eun Sook Kim

Ju Yeon Song

Dae Wi Kim

Keith F Chater

Kye Joon Lee

Affiliations

Soon will be listed here.

Abstract

SCO4677 is one of a large number of similar genes in Streptomyces coelicolor that encode proteins with an HATPase_c domain resembling that of anti-sigma factors such as SpoIIAB of Bacillus subtilis. However, SCO4677 is not located close to genes likely to encode a cognate sigma or anti-anti-sigma factor. SCO4677 was found to regulate antibiotic production and morphological differentiation, both of which were significantly enhanced by the deletion of SCO4677. Through protein-protein interaction screening of candidate sigma factor partners using the yeast two-hybrid system, SCO4677 protein was found to interact with the developmentally specific sigma(F), suggesting that it is an antagonistic regulator of sigma(F). Two other proteins, encoded by SCO0781 and SCO0869, were found to interact with the SCO4677 anti-sigma(F) during a subsequent global yeast two-hybrid screen, and the SCO0869-SCO4677 protein-protein interaction was confirmed by coimmunoprecipitation. The SCO0781 and SCO0869 proteins resemble well-known anti-anti-sigma factors such as SpoIIAA of B. subtilis. It appears that streptomycetes may possess an extraordinary abundance of anti-sigma factors, some of which may influence diverse processes through interactions with multiple partners: a novel feature for such regulatory proteins.

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