The mechanism of Ca2+ -dependent regulation of kinesin-mediated mitochondrial motility.

The mechanism of Ca2+ -dependent regulation of kinesin-mediated mitochondrial motility.
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Ca2+ 依赖性调节驱动蛋白介导的线粒体运动的机制。

DOI:
10.1016/j.cell.2008.11.046
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发表时间:
2009-01-09
期刊:
影响因子:
64.5
通讯作者:
Schwarz TL
Schwarz TL
中科院分区:
生物学1区
文献类型:
--
作者:
Wang X;Schwarz TL

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细胞调节线粒体运动,以适当地分配线粒体,从而满足细胞每个区域不断变化的能量需求。Ca++信号,停止顺行和逆行线粒体运动,是这样的调节。我们表明,EF-手的米罗介导这种逮捕和阐明的运动驱动蛋白-1的调节机制。无论线粒体是静止的、顺行移动的还是逆行移动的,驱动蛋白-1都保留在线粒体上,并且将驱动蛋白-1偶联到线粒体的蛋白质复合物不被升高的Ca++解离。相反,Ca++与Miro的结合允许Miro直接与马达结构域相互作用,从而阻止马达/微管相互作用。这种转换机制允许Ca++通过两种驱动蛋白状态来调节线粒体运动性:激活状态,其中驱动蛋白通过其尾部和米尔顿与线粒体结合,以及非激活状态,其中运动结构域直接结合Miro。破坏这种调节会降低神经元对兴奋性毒性的抵抗力。
Cells regulate mitochondrial movement in order to distribute mitochondria properly and thereby meet the changing energy needs of each region of the cell. Ca++ signaling, which halts both anterograde and retrograde mitochondrial motion, is one such regulation. We show that the EF-hands of Miro mediate this arrest and elucidate the regulatory mechanism of the motor kinesin-1. Kinesin-1 remains on mitochondria whether they are stationary, moving anterograde, or moving retrograde and the protein complex that couples kinesin-1 to mitochondria is not dissociated by elevated Ca++. Instead, Ca++-binding to Miro permits Miro to interact directly with the motor domain, thereby preventing motor/microtubule interactions. This switching mechanism allows Ca++ to regulate mitochondrial motility via two kinesin states: an active state in which kinesin is bound to mitochondria via its tail and milton, and an inactive state in which the motor domain binds directly Miro. Disrupting this regulation diminishes neuronal resistance to excitotoxicity.
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