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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Rotation scheme of V1-motor is different from that of F1-motor.
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Rotation scheme of V1-motor is different from that of F1-motor.

机译:V1电机的旋转方案与F1电机的旋转方案不同。

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摘要

V(1), a water-soluble portion of vacuole-type ATPase (V-ATPase), is an ATP-driven rotary motor, similar to F(1)-ATPase. Hydrolysis of ATP is coupled to unidirectional rotation of the central rotor D and F subunits relative to the A(3)B(3) cylinder. In this study, we analyzed the rotation kinetics of V(1) in detail. At low ATP concentrations, the D subunit rotated stepwise, pausing every 120 degrees . The dwell time between steps revealed that V(1) consumes one ATP per 120 degrees step. V(1) generated torque of approximately 35 pN nm, slightly lower than the approximately 46 pN nm measured for F(1). Noticeably, the angles for both ATP cleavage and binding were apparently the same in V(1), in sharp contrast to F(1), which cleaves ATP at 80 degrees posterior to the binding of ATP. Thus, the mechanochemical cycle of V(1) has marked differences to that of F(1).
机译:V(1)是液泡型ATPase(V-ATPase)的水溶性部分,是由ATP驱动的旋转马达,类似于F(1)-ATPase。 ATP的水解与中心转子D和F子单元相对于A(3)B(3)圆柱体的单向旋转耦合。在这项研究中,我们详细分析了V(1)的旋转动力学。在低ATP浓度下,D亚基逐步旋转,每120度暂停一次。步之间的停留时间表明V(1)每120度步消耗一个ATP。 V(1)产生的扭矩约为35 pN nm,略低于F(1)的约46 pN nm。值得注意的是,V(1)中的ATP切割和结合角度都明显相同,与F(1)形成鲜明对比,F(1)在ATP结合后80度切割ATP。因此,V(1)的机械化学循环与F(1)的机械化学循环有显着差异。

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