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A non-equilibrium mechanism of bacterial flagellar motor switches

 Last Update: 2022-01-25
 Source: Internet
 Author: User

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The research group of Yuan Junhua and Zhang Rongjing from the University of Science and Technology of China, Chinese Academy of Sciences, published a paper in Physical Review Letters, proposing a new non-equilibrium mechanism to modulate the allosteric of motor switches

The dynamic characteristics of flagellar motors are greatly affected by external loads, and in previous studies, the switching of motors from low to high loads was investigated
.

However, due to technical limitations, the switching dynamics of flagellar motors under extremely high loads or even stall conditions have not been investigated

In this paper, optical tweezers are used to stall the flagellar motor, and the high temporal and spatial resolution of optical tweezers is used to study the switching dynamics of the motor during stall, achieving accurate measurements
.

By further comparing the previous results of dynamic characteristics under other loads, the researchers propose a new mechanism whereby the asymmetrical torque when the motor rotates clockwise and counterclockwise provides an unbalanced energy input for motor switching
.

This new unbalanced mechanism is able to uniformly account for the dynamic behavior of the motor under various loads

This finding provides new insights into other nonequilibrium thermodynamic mechanisms of allosteric regulation and also explains the important physiological significance of torque asymmetry under both rotational conditions

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