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In vivo localizations of membrane stress controllers Escherichia coli

Lookup NU author(s): Professor Heath Murray, Professor Jeff Errington

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Abstract

The phage shock protein (Psp) response in Gram-negative bacteria counteracts membrane stress. Transcription of the PspF regulon (pspABCDE and pspG) in Escherichia coli is induced upon stresses that dissipate the proton motive force (pmf). Using GFP fusions we have visualized the subcellular localizations of PspA (a negative regulator and effector of Psp) and PspG (an effector of Psp). It has previously been proposed that PspA evenly coates the inner membrane of the cell. We now demonstrate that instead of uniformly covering the entire cell, PspA (and PspG) is highly organized into what appear to be distinct functional classes (complexes at the cell pole and the lateral cell wall). Real-time observations revealed lateral PspA and PspG complexes are highly mobile, but absent in cells lacking MreB. Without the MreB cytoskeleton, induction of the Psp response is still observed, yet these cells fail to maintain pmf under stress conditions. The two spatial subspecies therefore appear to be dynamically and functionally distinct with the polar clusters being associated with sensory function and the mobile complexes with maintenance of pmf.


Publication metadata

Author(s): Engl C, Jovanovic G, Lloyd LJ, Murray H, Spitaler M, Ying LM, Errington J, Buck M

Publication type: Article

Publication status: Published

Journal: Molecular Microbiology

Year: 2009

Volume: 73

Issue: 3

Pages: 382-396

ISSN (print): 0950-382X

ISSN (electronic): 1365-2958

Publisher: Wiley-Blackwell Publishing Ltd.

URL: http://dx.doi.org/10.1111/j.1365-2958.2009.06776.x

DOI: 10.1111/j.1365-2958.2009.06776.x


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