FLUCTUATION ANALYSIS OF ROTATIONAL SPEEDS OF THE BACTERIAL FLAGELLAR MOTOR

被引：54

作者：

SAMUEL, ADT ^{[1
]}

BERG, HC ^{[1
]}

机构：

[1] HARVARD UNIV,DEPT MOLEC & CELL BIOL,CAMBRIDGE,MA 02138

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 1995年 / 92卷 / 08期

关键词：

D O I：

10.1073/pnas.92.8.3502

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We measured the dependence of the variance in the rotation rate of tethered cells of Escherichia coli on the mean rotation rate over a regime in which the motor generates constant torque. This dependence was compared with that of broken motors. In either case, motor torque was augmented with externally applied torque. We show that, in contrast to broken motors, functioning motors in this regime do not freely rotationally diffuse and that the variance measurements are consistent with the predicted values of a stepping mechanism with exponentially distributed waiting times (a Poisson stepper) that steps approximately 400 times per revolution.

引用

页码：3502 / 3506

页数：5

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