Intraflagellar transport trains and motors: Insights from structure.

Intraflagellar transport trains and motors: Insights from structure.
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DOI:
10.1016/j.semcdb.2020.05.021
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发表时间:
2020-11
影响因子:
7.3
通讯作者:
Roberts AJ
Roberts AJ
中科院分区:
生物学2区
文献类型:
--
作者:
Webb S;Mukhopadhyay AG;Roberts AJ

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鞭毛内运输(IFT)塑造了纤毛和鞭毛的蛋白质组;在几乎所有人类细胞表面发现的天线状细胞器。IFT通过向生长中的纤毛尖端传递蛋白质、循环利用周转产物和选择性运输信号分子,在纤毛生物发生、质量控制和信号转导中发挥着关键作用。IFT包括长长的聚合阵列,称为IFT序列,在基于微管的运动蛋白kinesin-II和dynein-2的动力下进出纤毛尖端。最近自上而下和自下而上的结构生物学方法都集中在IFT列车机械的分子结构上。在这里,我们回顾了这些研究,重点是动力学蛋白ii和动力学蛋白2如何组装,附着在IFT列车上,并进行精确调节来介导双向运输。
Intraflagellar transport (IFT) sculpts the proteome of cilia and flagella; the antenna-like organelles found on the surface of virtually all human cell types. By delivering proteins to the growing ciliary tip, recycling turnover products, and selectively transporting signalling molecules, IFT has critical roles in cilia biogenesis, quality control, and signal transduction. IFT involves long polymeric arrays, termed IFT trains, which move to and from the ciliary tip under the power of the microtubule-based motor proteins kinesin-II and dynein-2. Recent top-down and bottom-up structural biology approaches are converging on the molecular architecture of the IFT train machinery. Here we review these studies, with a focus on how kinesin-II and dynein-2 assemble, attach to IFT trains, and undergo precise regulation to mediate bidirectional transport.
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