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Cooperative stator assembly of bacterial flagellar motor mediated by rotation

Author

Listed:
  • Kenta I. Ito

    (Tohoku University)

  • Shuichi Nakamura

    (Tohoku University)

  • Shoichi Toyabe

    (Tohoku University)

Abstract

Cooperativity has a central place in biological regulation, providing robust and highly-sensitive regulation. The bacterial flagellar motor implements autonomous torque regulation based on the stator’s dynamic structure; the stator units bind to and dissociate from the motor dynamically in response to environmental changes. However, the mechanism of this dynamic assembly is not fully understood. Here, we demonstrate the cooperativity in the stator assembly dynamics. The binding is slow at the stalled state, but externally forced rotation as well as driving by motor torque in either direction boosts the stator binding. Hence, once a stator unit binds, it drives the rotor and triggers the avalanche of succeeding bindings. This cooperative mechanism based on nonequilibrium allostery accords with the recently-proposed gear-type coupling between the rotor and stator.

Suggested Citation

  • Kenta I. Ito & Shuichi Nakamura & Shoichi Toyabe, 2021. "Cooperative stator assembly of bacterial flagellar motor mediated by rotation," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23516-y
    DOI: 10.1038/s41467-021-23516-y
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    Cited by:

    1. Haidai Hu & Philipp F. Popp & Mònica Santiveri & Aritz Roa-Eguiara & Yumeng Yan & Freddie J. O. Martin & Zheyi Liu & Navish Wadhwa & Yong Wang & Marc Erhardt & Nicholas M. I. Taylor, 2023. "Ion selectivity and rotor coupling of the Vibrio flagellar sodium-driven stator unit," Nature Communications, Nature, vol. 14(1), pages 1-14, December.

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