共 44 条
Functional reconstitution of the Na+-driven polar flagellar motor component of Vibrio alginolyticus
被引:118
作者:
Sato, K
[1
]
Homma, M
[1
]
机构:
[1] Nagoya Univ, Div Biol Sci, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan
关键词:
D O I:
10.1074/jbc.275.8.5718
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
The bacterial flagellar motor is a molecular machine that couples the influx of specific ions to the generation of the force necessary to drive rotation of the flagellar filament. Four integral membrane proteins, PomA, PomB, MotX, and MotY, have been suggested to be directly involved in torque generation of the Na+-driven polar flagellar motor of Vibrio alginolyticus. In the present study, we report the isolation of the functional component of the torque-generating unit. The purified protein complex appears to consist of PomA and PomB and contains neither MotX nor MotY. The PomA/B protein, reconstituted into proteoliposomes, catalyzed Na-22(+) influx in response to a potassium diffusion potential. Sodium uptake was abolished by the presence of Lif ions and phenamil, a sodium channel blocker. This is the first demonstration of a purification and functional reconstitution of the bacterial flagellar motor component involved in torque generation, in addition, this study demonstrates that the Nac-driven motor component, PomA and PomB, forms the Na+-conducting channel.
引用
收藏
页码:5718 / 5722
页数:5
相关论文