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TitleStructural insights into the assembly mechanism of the molecular bushing in the bacterial flagellar motor.
Journal, issue, pagesCommun Biol, Year 2026
Publish dateJul 13, 2026
AuthorsTomoko Yamaguchi / Tohru Minamino / Takayuki Kato / Fabienne F V Chevance / Kelly T Hughes / Keiichi Namba /
PubMed AbstractThe LP-ring complex of the Salmonella flagellar motor acts as a bushing that supports high-speed rotation of the rod, which serves as a drive shaft. The L-ring, P-ring, and distal rod consist of ...The LP-ring complex of the Salmonella flagellar motor acts as a bushing that supports high-speed rotation of the rod, which serves as a drive shaft. The L-ring, P-ring, and distal rod consist of FlgH, FlgI, and FlgG, respectively. LP-ring formation begins with P-ring assembly around the distal rod, where it remains firmly attached until the L-ring assembles above it. L-ring formation induces P-ring detachment, allowing the rod to freely rotate within the LP-ring, but this mechanism remains unclear. Here, we report the cryoEM structure of the P-ring assembled on a polyrod, an unusually elongated rod structure. The P-ring exhibits a slightly elliptical shape with a 2.7° tilt relative to the rod axis for its stable attachment. However, L-ring assembly on the P-ring causes steric clashes with the rod to induce P-ring detachment, allowing it to adopt a circular shape and complete the LP-ring as a functional bushing.
External linksCommun Biol / PubMed:42443432
MethodsEM (single particle) / EM (helical sym.)
Resolution2.33 - 4.0 Å
Structure data

60995

9iyc

EMDB-60995, PDB-9iyc:
P ring on polyrod-P ring complex from Salmonella TH26292 strain
Method: EM (single particle) / Resolution: 2.33 Å

61731

9jqo

EMDB-61731, PDB-9jqo:
Polyrod formed by FlgG (G65V) from the Salmonella TH26292 strain
Method: EM (helical sym.) / Resolution: 3.37 Å

EMDB-61835: Polyrod-P ring complex from Salmonella TH26292 strain
Method: EM (single particle) / Resolution: 4.0 Å

EMDB-80383: Polyrod without P-ring formed by FlgG (G65V) from the Salmonella TH26292 strain
Method: EM (single particle) / Resolution: 2.86 Å

Source
  • salmonella enterica subsp. enterica serovar typhimurium (bacteria)
KeywordsMOTOR PROTEIN / flagella motor. P ring on polyrod(PaPR) complex / Cryo-EM / SPA / Salmonella / flagella motor. polyrod / P ring on polyrod complex

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