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Phosphorylation‐mediated regulation of heat shock response in Escherichia coli

Abstract

Escherichia coli has two heat shock regulons under the transcriptional control of Esigma(32) and Esigma(E) RNA polymerases. These polymerases control the expression of genes, the products of which are needed for correct folding of proteins in the cytoplasm and the extracytoplasm respectively. In this study, we report that mutations in a tyrosine phosphatase-encoding gene led to decreased activity of these heat shock regulons. The activity of the tyrosine phosphatase is presumably co-ordinated with that of a cognate kinase. We show here that mutants deleted for the phosphatase-encoding gene accumulate phosphorylated RpoH. We find that RpoH is phosphorylated at amino acid position 260, which is located in the conserved region 4.2, and that this phosphorylation event attenuates RpoH activity as a sigma factor. The rpoH Tyr-260Ala mutation confers a temperature-sensitive phenotype that leads to an altered heat shock response. Additionally, we show that the antisigma factor RseA is phosphorylated at the N-terminally located Tyr-38 and that this phosphorylation presumably alters its binding affinity towards sigma(E) .

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Authors (3)

Keywords

Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
MOLECULAR MICROBIOLOGY no. 48, pages 269 - 285,
ISSN: 0950-382X
Language:
English
Publication year:
2003
Bibliographic description:
Klein-Raina G., Dartigalongue C., Raina S.: Phosphorylation‐mediated regulation of heat shock response in Escherichia coli// MOLECULAR MICROBIOLOGY -Vol. 48,iss. 1 (2003), s.269-285
DOI:
Digital Object Identifier (open in new tab) 10.1046/j.1365-2958.2003.03449.x
Verified by:
Gdańsk University of Technology

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