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KMID : 0364820130490030215
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Korean Journal of Microbiology
2013 Volume.49 No. 3 p.215 ~ p.220
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Regulation of Activity of the Response Regulator RssB
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Park Hee-Jeong
Bang Iel-Soo
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Abstract
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Against environmental stresses, many bacteria utilize the alternate sigma factor RpoS that induces transcription of
the specific set of genes helpful in promoting bacterial survival. Intracellular levels of RpoS are determined mainly by its turnover through proteolysis of ClpXP protease. Delivery of RpoS to ClpXP strictly requires the adaptor protein RssB. The two-component-type response regulator RssB constantly interacts with RpoS, but diverse environmental changes inhibit this interaction through modification of RssB activity, which increases RpoS levels in bacteria. This review discusses and summarizes recent findings on regulatory factors in RssB-RpoS interactions, including IraD, IraM, IraP anti-adaptor proteins of RssB and phosphorylation of N-terminal receiver domain of RssB. New information shows that the coordinated regulation of RssB activity in controlling RpoS turnover confers
efficient bacterial defense against stresses
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KEYWORD
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anti-adapator proteins, phosphorylation, RpoS proteolysis, RssB
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