Origin of tradeoff between movement velocity and attachment duration of kinesin motor on a microtubule  

作　　者：刘玉颖 张志强 Yuying Liu;Zhiqiang Zhang(Department of Physics,College of Science,China Agricultural University,Beijing 100083,China;Basic Ministry,Space Engineering University,Beijing 101416,China)

机构地区：[1]Department of Physics,College of Science,China Agricultural University,Beijing 100083,China [2]Basic Ministry,Space Engineering University,Beijing 101416,China

出　　处：《Chinese Physics B》2024年第2期557-566,共10页中国物理B（英文版）

摘　　要：Kinesin-1 motor protein is a homodimer containing two identical motor domains connected by a common long coiledcoil stalk via two flexible neck linkers. The motor can step on a microtubule with a velocity of about 1 μm·s-1and an attachment duration of about 1 s under physiological conditions. The available experimental data indicate a tradeoff between velocity and attachment duration under various experimental conditions, such as variation of the solution temperature,variation of the strain between the two motor domains, and so on. However, the underlying mechanism of the tradeoff is unknown. Here, the mechanism is explained by a theoretical study of the dynamics of the motor under various experimental conditions, reproducing quantitatively the available experimental data and providing additional predictions. How the various experimental conditions lead to different decreasing rates of attachment duration versus velocity is also explained.

关 键 词：motor protein VELOCITY detachment time PROCESSIVITY 

分 类 号：Q61[生物学—生物物理学]