4.8 Article

PomX, a ParA/MinD ATPase activating protein, is a triple regulator of cell division in Myxococcus xanthus

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ELIFE
卷 10, 期 -, 页码 -

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eLIFE SCIENCES PUBL LTD
DOI: 10.7554/eLife.66160

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  1. Deutsche Forschungsgemeinschaft [TRR 174]

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The positioning of cell division sites is precisely regulated, but the underlying mechanisms are not completely understood. In the bacterium Myxococcus xanthus, a tripartite PomX/Y/Z complex is responsible for positioning and stimulating the formation of the cytokinetic FtsZ-ring at midcell. The PomX protein has two functionally distinct domains and three functions, playing important roles in the interaction and fission of the PomX/Y/Z complex.
Cell division site positioning is precisely regulated but the underlying mechanisms are incompletely understood. In the social bacterium Myxococcus xanthus, the similar to 15 MDa tripartite PomX/Y/Z complex associates with and translocates across the nucleoid in a PomZ ATPase-dependent manner to directly position and stimulate formation of the cytokinetic FtsZ-ring at midcell, and then undergoes fission during division. Here, we demonstrate that PomX consists of two functionally distinct domains and has three functions. The N-terminal domain stimulates ATPase activity of the ParA/MinD ATPase PomZ. The C-terminal domain interacts with PomY and forms polymers, which serve as a scaffold for PomX/Y/Z complex formation. Moreover, the PomX/PomZ interaction is important for fission of the PomX/Y/Z complex. These observations together with previous work support that the architecturally diverse ATPase activating proteins of ParA/MinD ATPases are highly modular and use the same mechanism to activate their cognate ATPase via a short positively charged N-terminal extension.

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