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TitleConformational change of flagellin for polymorphic supercoiling of the flagellar filament.
Journal, issue, pagesNat Struct Mol Biol, Vol. 17, Issue 4, Page 417-422, Year 2010
Publish dateMar 14, 2010
AuthorsSaori Maki-Yonekura / Koji Yonekura / Keiichi Namba /
PubMed AbstractThe bacterial flagellar filament is a helical propeller rotated by the flagellar motor for bacterial locomotion. The filament is a supercoiled assembly of a single protein, flagellin, and is formed ...The bacterial flagellar filament is a helical propeller rotated by the flagellar motor for bacterial locomotion. The filament is a supercoiled assembly of a single protein, flagellin, and is formed by 11 protofilaments. For bacterial taxis, the reversal of motor rotation switches the supercoil between left- and right-handed, both of which arise from combinations of two distinct conformations and packing interactions of the L-type and R-type protofilaments. Here we report an atomic model of the L-type straight filament by electron cryomicroscopy and helical image analysis. Comparison with the R-type structure shows interesting features: an orientation change of the outer core domains (D1) against the inner core domains (D0) showing almost invariant orientation and packing, a conformational switching within domain D1, and the conformational flexibility of domains D0 and D1 with their spoke-like connection for tight molecular packing.
External linksNat Struct Mol Biol / PubMed:20228803
MethodsEM (helical sym.)
Resolution4.0 Å
Structure data

1641

3a5x

EMDB-1641: Helical reconstruction of the bacterial L-type flagella filament
PDB-3a5x: L-type straight flagellar filament made of full-length flagellin
Method: EM (helical sym.) / Resolution: 4.0 Å

Source
  • Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
  • salmonella typhimurium (bacteria)
KeywordsSTRUCTURAL PROTEIN / MOTOR PROTEIN / FLAGELLIN / FLAGELLAR FILAMENT / HELICAL RECONSTRUCTION / Bacterial flagellum / Secreted

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