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PlpA, a PilZ‐like protein, regulates directed motility of the bacterium Myxococcus xanthus
Author(s) -
Pogue Connor B.,
Zhou Tianyi,
Nan Beiyan
Publication year - 2018
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/mmi.13878
Subject(s) - myxococcus xanthus , gliding motility , motility , biology , microbiology and biotechnology , motor protein , cell polarity , mutant , cell , gene , genetics , microtubule
Summary The rod‐shaped bacterium Myxococcus xanthus moves on surfaces along its long cell axis and reverses its moving direction regularly. Current models propose that the asymmetric localization of a Ras‐like GTPase, MglA, to leading cell poles determines the moving direction of cells. However, cells are still motile in the mutants where MglA localizes symmetrically, suggesting the existence of additional regulators that control moving direction. In this study, we identified PlpA, a P ilZ‐ l ike p rotein that regulates the direction of motility. PlpA and MglA localize into opposite asymmetric patterns. Deletion of the plpA gene abolishes the asymmetry of MglA localization, increases the frequency of cellular reversals and leads to severe defects in cell motility. By tracking the movements of single motor particles, we demonstrated that PlpA and MglA co‐regulated the direction of gliding motility through direct interactions with the gliding motor. PlpA inhibits the reversal of individual gliding motors while MglA promotes motor reversal. By counteracting MglA near lagging cell poles, PlpA reinforces the polarity axis of MglA and thus stabilizes the direction of motility.