National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
米国
引用
ジャーナル: PLoS Pathog / 年: 2025 タイトル: FlbB forms a distinctive ring essential for periplasmic flagellar assembly and motility in Borrelia burgdorferi. 著者: Jack M Botting / Md Khalesur Rahman / Hui Xu / Jian Yue / Wangbiao Guo / Joshua T Del Mundo / Michal Hammel / Md A Motaleb / Jun Liu / 要旨: Spirochetes are a widespread group of bacteria with a distinct morphology. Some spirochetes are important human pathogens that utilize periplasmic flagella to achieve motility and host infection. The ...Spirochetes are a widespread group of bacteria with a distinct morphology. Some spirochetes are important human pathogens that utilize periplasmic flagella to achieve motility and host infection. The motors that drive the rotation of periplasmic flagella have a unique spirochete-specific feature, termed the collar, crucial for the flat-wave morphology and motility of the Lyme disease spirochete Borrelia burgdorferi. Here, we deploy cryo-electron tomography and subtomogram averaging to determine high-resolution in-situ structures of the B. burgdorferi flagellar motor. Comparative analysis and molecular modeling of in-situ flagellar motor structures from B. burgdorferi mutants lacking each of the known collar proteins (FlcA, FlcB, FlcC, FlbB, and Bb0236/FlcD) uncover a complex protein network at the base of the collar. Importantly, our data suggest that FlbB forms a novel periplasmic ring around the rotor but also acts as a scaffold supporting collar assembly and subsequent recruitment of stator complexes. The complex protein network based on the FlbB ring effectively bridges the rotor and 16 torque-generating stator complexes in each flagellar motor, thus contributing to the specialized motility and lifestyle of spirochetes in complex environments.
The odd half map used to calculate fourier shell correlation for a focused refined map of half of the flagellar collar from an flcB deletion mutant strain of Borreliella burgdorferi.
The even half map used to calculate fourier shell correlation for a focused refined map of half of the flagellar collar from an flcB deletion mutant strain of Borreliella burgdorferi.