title: Aeromonas hydrophila motY is essential for polar flagellum function, and requires coordinate expression of motX and Pom proteins.
abstract: By the analysis of the Aeromonas hydrophila ATCC7966(T) genome we identified A. hydrophila AH-3 MotY. A. hydrophila MotY, like MotX, is essential for the polar flagellum function energized by an electrochemical potential of Na(+) as coupling ion, but is not involved in lateral flagella function energized by the proton motive force. Thus, the A. hydrophila polar flagellum stator is a complex integrated by two essential proteins, MotX and MotY, which interact with one of two redundant pairs of proteins, PomAB and PomA(2)B(2). In an A. hydrophila motX mutant, polar flagellum motility is restored by motX complementation, but the ability of the A. hydrophila motY mutant to swim is not restored by introduction of the wild-type motY alone. However, its polar flagellum motility is restored when motX and -Y are expressed together from the same plasmid promoter. Finally, even though both the redundant A. hydrophila polar flagellum stators, PomAB and PomA(2)B(2), are energized by the Na(+) ion, they cannot be exchanged. Furthermore, Vibrio parahaemolyticus PomAB and Pseudomonas aeruginosa MotAB or MotCD are unable to restore swimming motility in A. hydrophila polar flagellum stator mutants.
authors: Departamento de Microbiología, Facultad de Biología, Universidad de Barcelona, Diagonal 645, 08071 Barcelona, Spain.
authors: Raquel
authors: R
authors: Molero
authors: Departamento de Microbiología, Facultad de Biología, Universidad de Barcelona, Diagonal 645, 08071 Barcelona, Spain.
authors: Markus
authors: M
authors: Wilhelms
authors: Departamento de Microbiología, Facultad de Biología, Universidad de Barcelona, Diagonal 645, 08071 Barcelona, Spain.
authors: Belén
authors: B
authors: Infanzón
authors: Departamento de Microbiología, Facultad de Biología, Universidad de Barcelona, Diagonal 645, 08071 Barcelona, Spain.
authors: Juan M
authors: JM
authors: Tomás
authors: Departamento de Microbiología, Facultad de Biología, Universidad de Barcelona, Diagonal 645, 08071 Barcelona, Spain.
authors: Susana
authors: S
authors: Merino
mesh_terms: D016980:Aeromonas hydrophila / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000595:Amino Acid Sequence; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D005407:Flagella / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D015964:Gene Expression Regulation, Bacterial; D008565:Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D008969:Molecular Sequence Data; D011485:Protein Binding; D016415:Sequence Alignment
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D008565:Membrane Proteins; C089633:MotX protein, bacteria; C103352:PomA protein, bacteria; C103353:PomB protein, bacteria