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TitleThe presence and absence of periplasmic rings in bacterial flagellar motors correlates with stator type.
Journal, issue, pagesElife, Vol. 8, Year 2019
Publish dateJan 16, 2019
AuthorsMohammed Kaplan / Debnath Ghosal / Poorna Subramanian / Catherine M Oikonomou / Andreas Kjaer / Sahand Pirbadian / Davi R Ortega / Ariane Briegel / Mohamed Y El-Naggar / Grant J Jensen /
PubMed AbstractThe bacterial flagellar motor, a cell-envelope-embedded macromolecular machine that functions as a cellular propeller, exhibits significant structural variability between species. Different torque- ...The bacterial flagellar motor, a cell-envelope-embedded macromolecular machine that functions as a cellular propeller, exhibits significant structural variability between species. Different torque-generating stator modules allow motors to operate in different pH, salt or viscosity levels. How such diversity evolved is unknown. Here, we use electron cryo-tomography to determine the in situ macromolecular structures of three Gammaproteobacteria motors: , , and , providing the first views of intact motors with dual stator systems. Complementing our imaging with bioinformatics analysis, we find a correlation between the motor's stator system and its structural elaboration. Motors with a single H-driven stator have only the core periplasmic P- and L-rings; those with dual H-driven stators have an elaborated P-ring; and motors with Na or Na/H-driven stators have both their P- and L-rings embellished. Our results suggest an evolution of structural elaboration that may have enabled pathogenic bacteria to colonize higher-viscosity environments in animal hosts.
External linksElife / PubMed:30648971 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution59.0 - 69.0 Å
Structure data

EMDB-0464:
Legionella pneumophila bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 64.0 Å

EMDB-0465:
Pseudomonas aeruginosa bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 59.0 Å

EMDB-0467:
Shewanella oneidensis MR-1 bacterial flagellar motor
Method: EM (subtomogram averaging) / Resolution: 69.0 Å

Source
  • Legionella pneumophila (bacteria)
  • Pseudomonas aeruginosa (bacteria)
  • Shewanella oneidensis MR-1 (bacteria)

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