Molecular basis of tubulin transport within the cilium by IFT74 and IFT81.

Molecular basis of tubulin transport within the cilium by IFT74 and IFT81.
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DOI:
10.1126/science.1240985
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发表时间:
2013-08-30
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lorentzen E
Lorentzen E
中科院分区:
其他
文献类型:
--
作者:
Bhogaraju S;Cajanek L;Fort C;Blisnick T;Weber K;Taschner M;Mizuno N;Lamla S;Bastin P;Nigg EA;Lorentzen E

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纤毛是一种存在于大多数真核细胞中的毛状细胞器,纤毛的形成与纤毛的形成有关。纤毛是纤毛前体,如微管蛋白,从细胞质到纤毛尖端的运输。然而,目前对IFT的分子机制知之甚少。在这里,我们发现两个核心IFT蛋白IFT74和IFT81形成了一个微管蛋白结合模块,并将相互作用映射到IFT81的Calponin同源结构域和IFT74的高碱性结构域。IFT81的敲除和点突变的挽救实验表明,IFT81与微管蛋白的结合是人类细胞纤毛发生所必需的。
Intraflagellar transport (IFT) of ciliary precursors such as tubulin from the cytoplasm to the ciliary tip is involved in the construction of the cilium, a hairlike organelle found on most eukaryotic cells. However, the molecular mechanisms of IFT are poorly understood. Here, we found that the two core IFT proteins IFT74 and IFT81 form a tubulin-binding module and mapped the interaction to a calponin homology domain of IFT81 and a highly basic domain in IFT74. Knockdown of IFT81 and rescue experiments with point mutants showed that tubulin binding by IFT81 was required for ciliogenesis in human cells.
鞭毛内运输平衡外部双联微管的连续周转:对鞭毛长度控制的影响。
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