The ATPase ClpX is Conditionally Involved in the Morphological Differentiation of Streptomyces Lividans

Overview

Journal Mol Genet Genomics

Specialty Genetics

Date 2003 Feb 18

PMID 12589431

Citations 9

Authors

J Viala

P MAZODIER

Affiliations

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Abstract

ATP-dependent proteases of the ClpP type are widespread in eubacteria. These proteolytic complexes are composed of a proteolytic subunit and an ATPase subunit. They are involved in the degradation of denatured proteins, but also play a role in specific regulatory pathways. In Streptomyces lividans strains which lack the proteolytic subunit ClpP1, cell cycle progression has been shown to be blocked at early stages of growth. In this study, we examined the role of the ATPase subunit ClpX, a possible partner of the products of the clpP1 operon. A clpX mutant was obtained and it was shown that its growth was impaired only on acidic medium. Thus, the clpX phenotype differs from the clpP1 phenotype, indicating that these two components have only partially overlapping roles. We also analyzed the expression of clpX. Although clpX expression is increased under heat-shock conditions in many bacteria, we found that this is not the case in S. lividans.

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