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.
Cross, Robert A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Alonso, Maria C.;Drummond, Douglas R.;Kain, Susan;Hoeng, Julia;Amos, Linda;Cross, Robert A.

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运动蛋白-1是一种双头分子马达,它沿着微管行走,每一步都由ATP结合控制。现有的门控机制模型提出了微管晶格的作用。我们发现未聚合的微管蛋白与激酶1结合,导致微管蛋白激活的ADP释放。在没有添加核苷酸的情况下,每个激酶-1二聚体结合一个微管蛋白异源二聚体。在不可水解的ATP类似物AMPPNP中,每个激酶-1二聚体结合两个微管蛋白异源二聚体。这些数据揭示了一个独立于微管晶格的atp门,通过atp依赖的在栓系激酶- adp头的微管蛋白结合位点上释放一个空间或变构块来运作。
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.
DOI: 10.1126/science.1092985
发表时间: 2003-12-19
期刊: SCIENCE
影响因子: 56.9
作者:
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通讯作者: Block, SM
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