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TitleMolecular mechanism for rotational switching of the bacterial flagellar motor.
Journal, issue, pagesNat Struct Mol Biol, Vol. 27, Issue 11, Page 1041-1047, Year 2020
Publish dateSep 7, 2020
AuthorsYunjie Chang / Kai Zhang / Brittany L Carroll / Xiaowei Zhao / Nyles W Charon / Steven J Norris / Md A Motaleb / Chunhao Li / Jun Liu /
PubMed AbstractThe bacterial flagellar motor can rotate in counterclockwise (CCW) or clockwise (CW) senses, and transitions are controlled by the phosphorylated form of the response regulator CheY (CheY-P). To ...The bacterial flagellar motor can rotate in counterclockwise (CCW) or clockwise (CW) senses, and transitions are controlled by the phosphorylated form of the response regulator CheY (CheY-P). To dissect the mechanism underlying flagellar rotational switching, we use Borrelia burgdorferi as a model system to determine high-resolution in situ motor structures in cheX and cheY3 mutants, in which motors are locked in either CCW or CW rotation. The structures showed that CheY3-P interacts directly with a switch protein, FliM, inducing a major remodeling of another switch protein, FliG2, and altering its interaction with the torque generator. Our findings lead to a model in which the torque generator rotates in response to an inward flow of H driven by the proton motive force, and conformational changes in FliG2 driven by CheY3-P allow the switch complex to interact with opposite sides of the rotating torque generator, facilitating rotational switching.
External linksNat Struct Mol Biol / PubMed:32895555 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution18.0 - 19.0 Å
Structure data

EMDB-21884:
Local refined structure of stator and C-ring interaction region in clockwise rotating delta-cheY3 Borrelia flagellar motor
Method: EM (subtomogram averaging) / Resolution: 19.0 Å

EMDB-21885:
Local refined stator-rotor interaction region in delta-cheX Borrelia flagellar motor
Method: EM (subtomogram averaging) / Resolution: 18.0 Å

EMDB-21886:
Local refined structure of stator and C-ring interaction region in counter-clockwise rotating delta-cheY3 Borrelia flagellar motor
Method: EM (subtomogram averaging) / Resolution: 18.0 Å

Source
  • Borreliella burgdorferi (Lyme disease spirochete)

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