Autoinhibition of the kinesin-2 motor KIF17 via dual intramolecular mechanisms.

Autoinhibition of the kinesin-2 motor KIF17 via dual intramolecular mechanisms.
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DOI:
10.1083/jcb.201001057
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发表时间:
2010-06-14
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Verhey KJ
Verhey KJ
中科院分区:
其他
文献类型:
--
作者:
Hammond JW;Blasius TL;Soppina V;Cai D;Verhey KJ

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驱动蛋白-2马达KIF 17自身抑制在体内可视化;在没有货物的情况下,这种同型二聚体的C-末端尾部阻断微管结合,卷曲螺旋段阻断运动性。细胞中的长距离运输是由驱动蛋白和动力蛋白马达驱动的,它们沿着沿着微管轨道移动。这些马达必须被严格地调节,以确保其传输事件的空间和时间保真度。驱动蛋白-1和驱动蛋白-3家族的运输马达受自身抑制的调节,但对驱动蛋白-2马达的调节机制知之甚少。我们表明,在没有货物的情况下,同二聚体驱动蛋白-2马达KIF 17保持在失活状态。自身抑制是由折叠构象引起的,折叠构象使非运动区能够直接接触并抑制运动域的酶活性。我们定义了两种有助于KIF 17自身抑制的分子机制。首先,C-末端尾干扰微管结合;第二,卷曲螺旋段阻断进行性运动。后者是驱动蛋白马达调节的新机制。这项工作支持的模型,自抑制是一个通用的机制,涉及在细胞内运输事件的驱动蛋白电机的调节。
Kinesin-2 motor KIF17 autoinhibition is visualized in vivo; in the absence of cargo, this homodimer’s C-terminal tail blocks microtubule binding, and a coiled-coil segment blocks motility. Long-distance transport in cells is driven by kinesin and dynein motors that move along microtubule tracks. These motors must be tightly regulated to ensure the spatial and temporal fidelity of their transport events. Transport motors of the kinesin-1 and kinesin-3 families are regulated by autoinhibition, but little is known about the mechanisms that regulate kinesin-2 motors. We show that the homodimeric kinesin-2 motor KIF17 is kept in an inactive state in the absence of cargo. Autoinhibition is caused by a folded conformation that enables nonmotor regions to directly contact and inhibit the enzymatic activity of the motor domain. We define two molecular mechanisms that contribute to autoinhibition of KIF17. First, the C-terminal tail interferes with microtubule binding; and second, a coiled-coil segment blocks processive motility. The latter is a new mechanism for regulation of kinesin motors. This work supports the model that autoinhibition is a general mechanism for regulation of kinesin motors involved in intracellular trafficking events.
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