A Chaperone for the Stator Units of a Bacterial Flagellum

MBio
Deborah A RibardoDavid R Hendrixson

Abstract

The stator units of the flagellum supply power to the flagellar motor via ion transport across the cytoplasmic membrane and generate torque on the rotor for rotation. Flagellar motors across bacterial species have evolved adaptations that impact and enhance stator function to meet the demands of each species, including producing stator units using different fuel types or various stator units for different motility modalities. Campylobacter jejuni produces one of the most complex and powerful flagellar motors by positioning 17 stator units at a greater radial distance than in most other bacteria to increase power and torque for high velocity of motility. We report another evolutionary adaptation impacting flagellar stators by identifying FlgX as a chaperone for C. jejuni stator units to ensure sufficient power and torque for flagellar rotation and motility. We discovered that FlgX maintains MotA and MotB stator protein integrity likely through a direct interaction with MotA that prevents their degradation. Suppressor analysis suggested that the physiology of C. jejuni drives the requirement for FlgX to protect stator units from proteolysis by the FtsH protease complex. C. jejuni ΔflgX was strongly attenuated for colonization of ...Continue Reading

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Citations

Aug 23, 2019·Nature Reviews. Microbiology·Andrea Du Toit
Apr 10, 2021·NPJ Biofilms and Microbiomes·You-Chul JungKyu-Ho Lee

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Datasets Mentioned

BETA
DAR4803

Methods Mentioned

BETA
PCR
coimmunoprecipitation
immunoprecipitation

Software Mentioned

Geneious
TMpred
Clustal Omega

Related Concepts

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Campylobacteriosis (ASM)

Campylobacteriosis is caused by the bacteria Campylobacter jejuni and is a common cause of gastroenteritis in humans. Discover the latest research on Campylobacteriosis here.