Neurofilament heavy chain side arm phosphorylation regulates axonal transport of neurofilaments.

Neurofilament heavy chain side arm phosphorylation regulates axonal transport of neurofilaments.
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DOI:
10.1083/jcb.200303138
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发表时间:
2003-05-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Miller CC
Miller CC
中科院分区:
其他
文献类型:
--
作者:
Ackerley S;Thornhill P;Grierson AJ;Brownlees J;Anderton BH;Leigh PN;Shaw CE;Miller CC

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神经丝拥有包含神经丝中链和重链(NFM 和 NFH)羧基末端结构域的侧臂; NFH 在轴突中被严重磷酸化。在这里,我们证明 NFH 侧臂的磷酸化是调节神经丝通过轴突运输的机制。已知 NFH 磷酸化位点发生突变以阻止磷酸化或模拟永久磷酸化的突变体在批量转运测定中显示出改变的转运速率。同样,应用 roscovitine(NFH 侧臂激酶 Cdk5/p35 的抑制剂)可加速神经丝转运。对转染活神经元中神经丝运动的分析表明,模仿永久磷酸化的突变体比不能磷酸化的突变体花费更高比例的暂停时间。因此,NFH 的磷酸化会减慢神经丝运输,这是由于神经丝运动的暂停增加所致。
Neurofilaments possess side arms that comprise the carboxy-terminal domains of neurofilament middle and heavy chains (NFM and NFH); that of NFH is heavily phosphorylated in axons. Here, we demonstrate that phosphorylation of NFH side arms is a mechanism for regulating transport of neurofilaments through axons. Mutants in which known NFH phosphorylation sites were mutated to preclude phosphorylation or mimic permanent phosphorylation display altered rates of transport in a bulk transport assay. Similarly, application of roscovitine, an inhibitor of the NFH side arm kinase Cdk5/p35, accelerates neurofilament transport. Analyses of neurofilament movement in transfected living neurons demonstrated that a mutant mimicking permanent phosphorylation spent a higher proportion of time pausing than one that could not be phosphorylated. Thus, phosphorylation of NFH slows neurofilament transport, and this is due to increased pausing in neurofilament movement.
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