相关实验视频

Updated: Feb 22, 2026

Biophysical Characterization of Flagellar Motor Functions

Biophysical Characterization of Flagellar Motor Functions

Published on: January 18, 2017

硬度作为一个机械开关用于调节扭矩在细菌鞭毛电机的扭矩

Biswajit Das¹, Jianhua Xing², Ajeet K Sharma³

¹Amrita School of Artificial Intelligence, Amrita Vishwa Vidyapeetham, Ettimadai, Coimbatore, Tamil Nadu, India.

Biophysical journal

|February 21, 2026

概括

细菌鞭毛电机表现出扭矩-转速不对称性,原因是弹性,而不是电机差异. 在反时钟方向旋转时,的灵活性会保持扭矩,而在时钟方向旋转时的硬会导致线性扭矩下降.

科学领域:

生物物理学的生物物理.
分子机器是分子机器.
细胞移动性细胞移动性

背景情况:

细菌鞭毛电机 (BFM) 将离子流转化为细胞运动的机械工作.
之前的模型预测了反时针方向 (CCW) 和时针方向 (CW) 旋转的对称扭矩-转速行为.
结构研究表明,用于CCW和CW方向的扭矩产生机械具有反射对称性.

研究的目的:

解决长期存在的扭矩-转速不对称性在细菌鞭毛电机中的难题.
为了确定CCW和CW旋转之间观察到的不对称性的机械起源.
为了研究弹性的作用在扭矩传输.

主要方法:

单分子测量电机扭矩和转速.
开发一个包含弹性的数学模型.
实验数据与模型预测的比较.

主要成果:

单分子实验揭示了不对称性:CCW旋转中的扭矩平原和CW旋转中的线性扭矩下降.
的旋转依赖弹性被确定为不对称的来源.
在CCW旋转中,曲的子保持时间尺度的分离,保持扭矩平原.
在CW旋转中,直直的子崩了时间尺度的分离,导致了线性扭矩-转速关系.

结论:

杆弹性,而不是发动机扭矩生成单元,解释了BFM的扭矩速度不对称.
的机械性能是旋转分子机器扭矩传输的关键调节器.
该研究解决了BFM功能的关键难题,并强调了机械调节的重要性.

更多相关视频

Measuring the Bending Stiffness of Bacterial Cells Using an Optical Trap

Measuring the Bending Stiffness of Bacterial Cells Using an Optical Trap

Published on: April 26, 2010

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Published on: May 10, 2020

相关概念视频

Flagella and Motility in Bacteria

Flagella and Motility in Bacteria

Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...

Mechanism of Ciliary Motion

Mechanism of Ciliary Motion

The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...

Torque

Torque

Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...

Electro-mechanical Systems

Electro-mechanical Systems

Electromechanical systems are intricate configurations that effectively combine electrical and mechanical elements to achieve a desired outcome. Central to many of these systems is the DC motor, a device that converts electrical energy into mechanical motion, enabling various applications ranging from simple fans to complex robotic mechanisms.
A key component of the DC motor is the armature, a rotating circuit positioned within a magnetic field. As an electric current passes through the...

Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Microtubules in Cell Motility

Microtubules in Cell Motility

Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...