Assembly of motor proteins, PomA and PomB, in the Na+-driven stator of the flagellar motor

Hajime Fukuoka, Toshiharu Yakushi, Akiko Kusumoto, Michio Homma

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

PomA and PomB are transmembrane proteins that form the stator complex in the sodium-driven flagellar motor of Vibrio alginolyticus and are believed to surround the rotor part of the flagellar motor. We constructed and observed green fluorescent protein (GFP) fusions of the stator proteins PomA and PomB in living cells to clarify how stator proteins are assembled and installed into the flagellar motor. We were able to demonstrate that GFP-PomA and GFP-PomB localized to a cell pole dependent on the presence of the polar flagellum. Localization of the GFP-fused stator proteins required their partner subunit, PomA or PomB, and the C-terminal domain of PomB, which has a peptidoglycan-binding motif. Each of the GFP-fused stator proteins was co-isolated with its partner subunit from detergent-solubilized membrane. From these lines of evidence, we have demonstrated that the stator proteins are incorporated into the flagellar motor as a PomA/PomB complex and are fixed to the cell wall via the C-terminal domain of PomB.

Original languageEnglish
Pages (from-to)707-717
Number of pages11
JournalJournal of Molecular Biology
Volume351
Issue number4
DOIs
Publication statusPublished - 2005 Aug 26

Keywords

  • Energy transduction
  • GFP
  • Membrane protein
  • Sodium motive force
  • Vibrio

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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