期刊
FRONTIERS IN MICROBIOLOGY
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.668892
关键词
flagella; c-di-GMP; flagellar motor; YcgR; Shewanella; PilZ domain; lateral flagella
类别
资金
- Deutsche Forschungsgemeinschaft (DFG) [TH831/5-2]
- DFG [1879]
This study identified a protein, MotL, which specifically regulates the activity of lateral flagellar motors in response to c-di-GMP levels. MotL, containing a PilZ domain binding c-di-GMP, slows down the rotation of lateral flagella at elevated c-di-GMP levels and may speed up the movement at low c-di-GMP concentrations. Interaction studies suggest an interaction of MotL with the C-ring of lateral flagellar motors, demonstrating differential c-di-GMP-dependent regulation of the two flagellar systems.
A number of bacterial species control the function of the flagellar motor in response to the levels of the secondary messenger c-di-GMP, which is often mediated by c-di-GMP-binding proteins that act as molecular brakes or clutches to slow the motor rotation. The gammaproteobacterium Shewanella putrefaciens possesses two distinct flagellar systems, the primary single polar flagellum and a secondary system with one to five lateral flagellar filaments. Here, we identified a protein, MotL, which specifically regulates the activity of the lateral, but not the polar, flagellar motors in response to the c-di-GMP levels. MotL only consists of a single PilZ domain binding c-di-GMP, which is crucial for its function. Deletion and overproduction analyses revealed that MotL slows down the lateral flagella at elevated levels of c-di-GMP, and may speed up the lateral flagellar-mediated movement at low c-di-GMP concentrations. In vitro interaction studies hint at an interaction of MotL with the C-ring of the lateral flagellar motors. This study shows a differential c-di-GMP-dependent regulation of the two flagellar systems in a single species, and implicates that PilZ domain-only proteins can also act as molecular regulators to control the flagella-mediated motility in bacteria.
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