JIP1 regulates the directionality of APP axonal transport by coordinating kinesin and dynein motors.

JIP1 regulates the directionality of APP axonal transport by coordinating kinesin and dynein motors.
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DOI:
10.1083/jcb.201302078
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发表时间:
2013-08-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Holzbaur EL
Holzbaur EL
中科院分区:
其他
文献类型:
--
作者:
Fu MM;Holzbaur EL

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支架蛋白JIP 1的磷酸化作为一个分子开关来协调淀粉样前体蛋白转运中涉及的顺行和逆行微管运动复合物。驱动轴突运输的驱动蛋白和动力蛋白马达对维持神经元稳态至关重要。在这里,我们检查协调运动活动的支架蛋白JNK相互作用蛋白1(JIP 1),我们发现这是所需的长距离顺行和逆行的淀粉样前体蛋白(APP)的运动轴突。我们确定了JIP1和驱动蛋白重链(KHC)之间的新的相互作用,缓解KHC自身抑制,激活运动功能的单分子测定。dynactin亚基p150Glued与JIP 1的直接结合竞争性抑制体外KHC活化并破坏APP在神经元中的转运。总之,这些实验支持一个模型,即JIP1协调APP运输之间的顺行和逆行运动复合体的切换。我们发现JIP1中JNK依赖性磷酸化位点S421的突变改变了体外KHC活化和神经元中APP转运的方向性。因此,磷酸化的S421的JIP 1作为一个分子开关,以调节APP运输的方向在神经元中。
Phosphorylation of the scaffolding protein JIP1 serves as a molecular switch to coordinate anterograde and retrograde microtubule motor complexes involved in amyloid precursor protein transport. Regulation of the opposing kinesin and dynein motors that drive axonal transport is essential to maintain neuronal homeostasis. Here, we examine coordination of motor activity by the scaffolding protein JNK-interacting protein 1 (JIP1), which we find is required for long-range anterograde and retrograde amyloid precursor protein (APP) motility in axons. We identify novel interactions between JIP1 and kinesin heavy chain (KHC) that relieve KHC autoinhibition, activating motor function in single molecule assays. The direct binding of the dynactin subunit p150Glued to JIP1 competitively inhibits KHC activation in vitro and disrupts the transport of APP in neurons. Together, these experiments support a model whereby JIP1 coordinates APP transport by switching between anterograde and retrograde motile complexes. We find that mutations in the JNK-dependent phosphorylation site S421 in JIP1 alter both KHC activation in vitro and the directionality of APP transport in neurons. Thus phosphorylation of S421 of JIP1 serves as a molecular switch to regulate the direction of APP transport in neurons.
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