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Load-dependent sliding direction change of a myosin head on an actin molecule and its energetic aspects: Energy borrowing model of a cross-bridge cycle
myosin ATPase enthalpy production molecular machinery loose coupling Hill’s Formulation
2010/12/2
A model of muscle contraction is proposed, assuming loose coupling between power strokes and ATP hydrolysis of a myosin head. The energy borrowing mechanism is introduced in a cross-bridge cycle that ...
myosin V利用ATP水解释放的自由能，朝肌动蛋白微丝正端作定向运动，平均步长约为36nm．最近几年的诸多实验数据表明，myosin V步长和出现概率的柱状图符合高斯分布，马达步长并非固定的36nm；且在负载力大于2pN的情况下会出现 “中间步长”和后退步子的现象．可以根据已有的实验数据，同时考虑溶液摩擦力、常负载力和高斯随机力对马达位置的影响，提出一种马达的跃迁模型，并以此为基础对上述现象进...
Fluctuation of actin sliding over myosin thick filaments in vitro
protein motors cooperativity synchronization
2010/12/2
It is customarily thought that myosin motors act as independent force-generators in both isotonic unloaded shortening as well as isometric contraction of muscle. We tested this assumption regarding un...