Myosin I can act as a molecular force sensor.
Myosin I can act as a molecular force sensor.
复制标题
肌球蛋白我可以充当分子力传感器。
DOI:
10.1126/science.1159419
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发表时间:
2008-07-04
期刊:
影响因子:
56.9
通讯作者:
Ostap, E. Michael
中科院分区:
文献类型:
--
作者:
Laakso, Joseph M.;Lewis, John H.;Shuman, Henry;Ostap, E. Michael
The ability to sense molecular tension is crucial for a wide array of cellular processes, including the detection of auditory stimuli, control of cell shape, and internalization and transport of membranes. We show that myosin-I, a motor protein which has been implicated in powering key steps in these processes, dramatically alters its motile properties in response to tension. We measured the displacement generated by single myosin-I molecules, and we determined the actin-attachment kinetics with varying tensions using an optical trap. The rate of myosin-I detachment from actin decreases > 75-fold within 2 pN of tension, resulting in myosin-I transitioning from a low (< 0.2) to a high duty-ratio motor (> 0.9). This impressive tension sensitivity supports a role for myosin-I as a molecular force sensor.
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