An ATP gate controls tubulin binding by the tethered head of kinesin-1.
An ATP gate controls tubulin binding by the tethered head of kinesin-1.
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ATP栅极控制驱动蛋白1的束缚头微管蛋白结合。
DOI:
10.1126/science.1136985
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发表时间:
2007-04-06
期刊:
影响因子:
56.9
通讯作者:
Cross, Robert A.
中科院分区:
文献类型:
--
作者:
Alonso, Maria C.;Drummond, Douglas R.;Kain, Susan;Hoeng, Julia;Amos, Linda;Cross, Robert A.
Kinesin-1 is a 2-headed molecular motor that walks along microtubules, with each step gated by ATP binding. Existing models for the gating mechanism propose a role for the microtubule lattice. We show that unpolymerised tubulin binds to kinesin-1, causing tubulin-activated ADP release. With no added nucleotide, each kinesin-1 dimer binds one tubulin heterodimer. In AMPPNP, a nonhydrolysable ATP analogue, each kinesin-1 dimer binds two tubulin heterodimers. The data reveal an ATP-gate that operates independently of the microtubule lattice, by ATP-dependent release of a steric or allosteric block on the tubulin binding site of the tethered kinesin-ADP head.
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影响因子:
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DOI:
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