A universal pathway for kinesin stepping.
A universal pathway for kinesin stepping.
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DOI:
10.1038/nsmb.2104
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发表时间:
2011-08-14
影响因子:
16.8
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中科院分区:
文献类型:
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Kinesin-1 is an ATP-driven, processive motor that transports cargo along microtubules in a tightly regulated stepping cycle. Efficient gating mechanisms ensure that the sequence of kinetic events proceeds in proper order, generating a large number of successive reaction cycles. To study gating, we created two mutant constructs with extended neck-linkers and measured their properties using single-molecule optical trapping and ensemble fluorescence techniques. Due to a reduction in the inter-head tension, the constructs access an otherwise rarely populated conformational state where both motor heads remain bound to the microtubule. ATP-dependent, processive backstepping and futile hydrolysis were observed under moderate hindering loads. Based on measurements, we formulated a comprehensive model for kinesin motion that incorporates reaction pathways for both forward and backward stepping. In addition to inter-head tension, we find that neck-linker orientation is also responsible for ensuring gating in kinesin.
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影响因子:
11.4
作者:
Crevel, IMTC;Nyitrai, M;Cross, RA
通讯作者:
Cross, RA
影响因子:
56.9
作者:
Asbury, CL;Fehr, AN;Block, SM
通讯作者:
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DOI:
10.1073/pnas.91.15.6865
发表时间:
1994-07-19
影响因子:
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作者:
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通讯作者:
HACKNEY, DD
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作者:
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通讯作者:
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通讯作者:
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