期刊
MOLECULAR CELL
卷 17, 期 4, 页码 603-609出版社
CELL PRESS
DOI: 10.1016/j.molcel.2005.01.015
关键词
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资金
- NIGMS NIH HHS [R01 GM033289] Funding Source: Medline
Myosin VI moves processively along actin with a larger step size than expected from the size of the motor. Here, we show that the proximal tail (the similar to80-residue segment following the IQ domain) is not a rigid structure but, rather, a flexible domain that permits the heads to separate. With a GCN4 coiled coil inserted in the proximal tail, the heads are closer together in electron microscopy (EM) images, and the motor takes shorter processive steps. Single-headed myosin V1 S1 constructs take nonprocessive 12 nm steps, suggesting that most of the processive step is covered by a diffusive search for an actin binding site. Based on these results, we present a mechanical model that describes stepping under an applied load.
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