Trimerisation is important for the function of clathrin at the mitotic spindle.

Trimerisation is important for the function of clathrin at the mitotic spindle.
复制标题

修剪对于丝分裂纺锤体上网状蛋白的功能很重要。

DOI:
10.1242/jcs.03192
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发表时间:
2006-10-01
影响因子:
4
通讯作者:
Lagnado L
Lagnado L
中科院分区:
生物学2区
文献类型:
--
作者:
Royle SJ;Lagnado L

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网格蛋白是由三个重链和一个轻链组成的三叉戟。在有丝分裂过程中,网格蛋白有助于着丝点纤维的稳定性。由于每条腿底部的n端结构域可以与有丝分裂纺锤体结合,我们之前提出了一个“桥假说”,其中网格蛋白在着丝点纤维内的两个或三个微管之间起支撑作用,以增加纤维的稳定性。在这里,我们通过用一组网格蛋白构建物取代人类细胞中的内源性网格蛋白重链来验证这一假设。旨在消除三聚体化的突变体无法挽救内源性网格蛋白耗竭引起的有丝分裂缺陷。相反,腿收缩的发育不良的三瓣体可以部分挽救正常的有丝分裂。这些结果表明,网格蛋白在有丝分裂中发挥作用所必需的关键结构特征是两端具有纺锤体相互作用结构域的三聚体分子,支持了网格蛋白在有丝分裂中功能的“桥假说”。
Clathrin is a triskelion consisting of three heavy chains each with an associated light chain. During mitosis, clathrin contributes to kinetochore fibre stability. As the N-terminal domain at the foot of each leg can bind to the mitotic spindle, we proposed previously a “bridge hypothesis” wherein clathrin acts as a brace between two or three microtubules within a kinetochore fibre to increase fibre stability. Here, we have tested this hypothesis by replacing endogenous clathrin heavy chain in human cells with a panel of clathrin constructs. Mutants designed to abolish trimerization were unable to rescue the mitotic defects caused by depletion of endogenous clathrin. In contrast, stunted triskelia with contracted legs could partially rescue normal mitosis. These results indicate that the key structural features of clathrin that are necessary for its function in mitosis are a trimeric molecule with a spindle interaction domain at each end, supporting the “bridge hypothesis” for clathrin function in mitosis.
DOI: 10.1038/289420a0
发表时间: 1981-01-01
期刊: NATURE
影响因子: 64.8
作者:
UNGEWICKELL, E;BRANTON, D
通讯作者: BRANTON, D
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发表时间: 1995-12-29
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发表时间: 2005-04-28
期刊: NATURE
影响因子: 64.8
作者:
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通讯作者: Lagnado, L