Robust mechanosensing and tension generation by myosin VI.
Robust mechanosensing and tension generation by myosin VI.
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DOI:
10.1016/j.jmb.2010.10.010
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发表时间:
2011-01-07
影响因子:
5.6
通讯作者:
Dunn AR
中科院分区:
文献类型:
--
作者:
Chuan P;Spudich JA;Dunn AR
Myosin VI is a molecular motor that is thought to function as both a transporter and a cytoskeletal anchor in vivo. Here we use optical tweezers to examine force generation by single molecules of myosin VI under physiological nucleotide concentrations. We find that myosin VI is an efficient transporter at loads up to ~2 pN but acts as a cytoskeletal anchor at higher loads. Our data and resulting model are consistent with an indirect coupling of global structural motions to nucleotide binding and release. The model provides a mechanism by which load may regulate the dual functions of myosin VI in vivo. Our results suggest that myosin VI kinetics are tuned such that the motor maintains a consistent level of mechanical tension within the cell, a property potentially shared by other mechanosensitive proteins.
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