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  A Response Regulator Interfaces between the Frz Chemosensory System and the MglA/MglB GTPase/GAP Module to Regulate Polarity in Myxococcus xanthus

Keilberg, D., Wuichet, K., Drescher, F., & Sogaard-Andersen, L. (2012). A Response Regulator Interfaces between the Frz Chemosensory System and the MglA/MglB GTPase/GAP Module to Regulate Polarity in Myxococcus xanthus. PLoS Genetics, 8(9): e1002951. doi:10.1371/journal.pgen.1002951.

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Keilberg, D.1, Autor           
Wuichet, K.1, Autor           
Drescher, F.1, Autor           
Sogaard-Andersen, L.1, Autor           
Affiliations:
1Bacterial Adaption and Differentiation, Department of Ecophysiology, Max Planck Institute for Terrestrial Microbiology, Max Planck Society, ou_3266305              

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 Zusammenfassung: How cells establish and dynamically change polarity are general questions in cell biology. Cells of the rod-shaped bacterium Myxococcus xanthus move on surfaces with defined leading and lagging cell poles. Occasionally, cells undergo reversals, which correspond to an inversion of the leading-lagging pole polarity axis. Reversals are induced by the Frz chemosensory system and depend on relocalization of motility proteins between the poles. The Ras-like GTPase MglA localizes to and defines the leading cell pole in the GTP-bound form. MglB, the cognate MglA GTPase activating protein, localizes to and defines the lagging pole. During reversals, MglA-GTP and MglB switch poles and, therefore, dynamically localized motility proteins switch poles. We identified the RomR response regulator, which localizes in a bipolar asymmetric pattern with a large cluster at the lagging pole, as important for motility and reversals. We show that RomR interacts directly with MglA and MglB in vitro. Furthermore, RomR, MglA, and MglB affect the localization of each other in all pair-wise directions, suggesting that RomR stimulates motility by promoting correct localization of MglA and MglB in MglA/RomR and MglB/RomR complexes at opposite poles. Moreover, localization analyses suggest that the two RomR complexes mutually exclude each other from their respective poles. We further show that RomR interfaces with FrzZ, the output response regulator of the Frz chemosensory system, to regulate reversals. Thus, RomR serves at the functional interface to connect a classic bacterial signalling module (Frz) to a classic eukaryotic polarity module (MglA/MglB). This modular design is paralleled by the phylogenetic distribution of the proteins, suggesting an evolutionary scheme in which RomR was incorporated into the MglA/MglB module to regulate cell polarity followed by the addition of the Frz system to dynamically regulate cell polarity.

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Sprache(n): eng - English
 Datum: 2012-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 635416
ISI: 000309817900026
DOI: 10.1371/journal.pgen.1002951
 Art des Abschluß: -

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Titel: PLoS Genetics
  Alternativer Titel : PLoS Genet.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: SAN FRANCISCO : PUBLIC LIBRARY SCIENCE
Seiten: - Band / Heft: 8 (9) Artikelnummer: e1002951 Start- / Endseite: - Identifikator: ISSN: 1553-7404