Cytoplasmic dynein moves through uncoordinated stepping of the AAA+ ring domains.

Cytoplasmic dynein moves through uncoordinated stepping of the AAA+ ring domains.
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DOI:
10.1126/science.1215804
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发表时间:
2012-01-13
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Yildiz A
Yildiz A
中科院分区:
其他
文献类型:
--
作者:
DeWitt MA;Chang AY;Combs PA;Yildiz A

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细胞质动力蛋白是一种同源二聚体AAA+马达,它将大量的货物运送到微管的负端。这两个催化头域在前进运动中如何相互作用和相对移动尚不清楚。在这里,我们以纳米级的精度跟踪两个头部的相对位置,并直接观察到头部沿着微管独立运动。头部保持着很大的距离,他们的步态随着头部之间的距离而变化。一个活跃的头部就足以进行前进运动,而一个活跃的头部可以将不活跃的伙伴的头部向前拖动。因此,动力蛋白在没有头部协调的情况下连续移动,这一机制从根本上不同于动蛋白和肌球蛋白的交叉步进。
Cytoplasmic dynein is a homodimeric AAA+ motor that transports a multitude of cargos toward the microtubule minus end. How the two catalytic head domains interact and move relative to each other during processive movement is unclear. Here, we tracked the relative positions of both heads with nanometer precision and directly observed the heads moving independently along the microtubule. The heads remained widely separated, and their stepping behavior varied as a function of interhead separation. One active head was sufficient for processive movement, and an active head could drag an inactive partner head forward. Thus, dynein moves processively without interhead coordination, a mechanism fundamentally distinct from the hand-over-hand stepping of kinesin and myosin.
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