A single protofilament is sufficient to support unidirectional walking of dynein and kinesin.

A single protofilament is sufficient to support unidirectional walking of dynein and kinesin.
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单一的原丝足以支持动力蛋白和动力素的单向步行。

DOI:
10.1371/journal.pone.0042990
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Toyoshima YY
Toyoshima YY
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shibata K;Miura M;Watanabe Y;Saito K;Nishimura A;Furuta K;Toyoshima YY

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细胞质动力蛋白和驱动蛋白是双头微管运动蛋白,在微管上以相反方向移动。众所周知,驱动蛋白通过“手交手”机制进行步进,但尚不清楚动力蛋白通过哪种机制进行步进。由于动力蛋白的结构与驱动蛋白完全不同,且其头部巨大,因此怀疑动力蛋白利用多根微管原丝行走。测试这一点的一种方法是询问动力蛋白是否可以沿着单个原丝行走。在这里,我们检查了锌诱导的微管蛋白片(锌片)上的动力蛋白和驱动蛋白运动性,该微管蛋白片只有一根原丝可用作运动蛋白的轨道。与微管相比,动力蛋白和驱动蛋白的单分子在锌片上以相似的速度移动,清楚地表明动力蛋白和驱动蛋白可以在单个原丝上行走,多排平行的原丝对于它们的运动来说并不是必需的。考虑到动力蛋白的大小和运动特性,我们认为动力蛋白可能通过尺蠖机制而不是手交机制行走。
Cytoplasmic dynein and kinesin are two-headed microtubule motor proteins that move in opposite directions on microtubules. It is known that kinesin steps by a ‘hand-over-hand’ mechanism, but it is unclear by which mechanism dynein steps. Because dynein has a completely different structure from that of kinesin and its head is massive, it is suspected that dynein uses multiple protofilaments of microtubules for walking. One way to test this is to ask whether dynein can step along a single protofilament. Here, we examined dynein and kinesin motility on zinc-induced tubulin sheets (zinc-sheets) which have only one protofilament available as a track for motor proteins. Single molecules of both dynein and kinesin moved at similar velocities on zinc-sheets compared to microtubules, clearly demonstrating that dynein and kinesin can walk on a single protofilament and multiple rows of parallel protofilaments are not essential for their motility. Considering the size and the motile properties of dynein, we suggest that dynein may step by an inchworm mechanism rather than a hand-over-hand mechanism.
DOI: 10.1126/science.1164424
发表时间: 2008-12-12
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Carter AP;Garbarino JE;Wilson-Kubalek EM;Shipley WE;Cho C;Milligan RA;Vale RD;Gibbons IR
通讯作者: Gibbons IR
DOI: 10.1016/s0006-3495(01)75925-5
发表时间: 2001-11-01
影响因子: 3.4
作者:
Inoue, Y;Iwane, AH;Yanagida, T
通讯作者: Yanagida, T
DOI: 10.1038/376274a0
发表时间: 1995-07-20
期刊: NATURE
影响因子: 64.8
作者:
KIKKAWA, M;ISHIKAWA, T;HIROKAWA, N
通讯作者: HIROKAWA, N
DOI: 10.1038/376277a0
发表时间: 1995-07-20
期刊: NATURE
影响因子: 64.8
作者:
HIROSE, K;LOCKHART, A;AMOS, LA
通讯作者: AMOS, LA
DOI: 10.1073/pnas.91.15.6865
发表时间: 1994-07-19
影响因子: 11.1
作者:
HACKNEY, DD
通讯作者: HACKNEY, DD