Motility protein A, N-terminal / Motility protein A N-terminal / : / Flagellar motor protein MotA, conserved site / Flagellar motor protein motA family signature. / Motility protein B-like, N-terminal domain / Membrane MotB of proton-channel complex MotA/MotB / MotA/TolQ/ExbB proton channel / MotA/TolQ/ExbB proton channel family / Flagellar motor switch protein FliG ...Motility protein A, N-terminal / Motility protein A N-terminal / : / Flagellar motor protein MotA, conserved site / Flagellar motor protein motA family signature. / Motility protein B-like, N-terminal domain / Membrane MotB of proton-channel complex MotA/MotB / MotA/TolQ/ExbB proton channel / MotA/TolQ/ExbB proton channel family / Flagellar motor switch protein FliG / Flagellar motor switch protein FliG, alpha-helical / Flagellar motor switch protein FliG, C-terminal / Flagellar motor switch protein FliG, N-terminal domain / Flagellar motor switch protein FliG, middle domain / FliG C-terminal domain / FliG middle domain / FliG N-terminal domain / OmpA-like domain superfamily / OmpA family / OmpA-like domain / OmpA-like domain profile. 類似検索 - ドメイン・相同性
Flagellar motor switch protein FliG / Motility protein A / OmpA family protein 類似検索 - 構成要素
National Institutes of Health/National Cancer Institute (NIH/NCI)
CCR Core Funding for Lea Group
米国
引用
ジャーナル: Nat Microbiol / 年: 2024 タイトル: Structural basis of directional switching by the bacterial flagellum. 著者: Steven Johnson / Justin C Deme / Emily J Furlong / Joseph J E Caesar / Fabienne F V Chevance / Kelly T Hughes / Susan M Lea / 要旨: The bacterial flagellum is a macromolecular protein complex that harvests energy from uni-directional ion flow across the inner membrane to power bacterial swimming via rotation of the flagellar ...The bacterial flagellum is a macromolecular protein complex that harvests energy from uni-directional ion flow across the inner membrane to power bacterial swimming via rotation of the flagellar filament. Rotation is bi-directional, with binding of a cytoplasmic chemotactic response regulator controlling reversal, though the structural and mechanistic bases for rotational switching are not well understood. Here we present cryoelectron microscopy structures of intact Salmonella flagellar basal bodies (3.2-5.5 Å), including the cytoplasmic C-ring complexes required for power transmission, in both counter-clockwise and clockwise rotational conformations. These reveal 180° movements of both the N- and C-terminal domains of the FliG protein, which, when combined with a high-resolution cryoelectron microscopy structure of the MotAB stator, show that the stator shifts from the outside to the inside of the C-ring. This enables rotational switching and reveals how uni-directional ion flow across the inner membrane is used to accomplish bi-directional rotation of the flagellum.