Human IFT-A complex structures provide molecular insights into ciliary transport.

Human IFT-A complex structures provide molecular insights into ciliary transport.
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DOI:
10.1038/s41422-023-00778-3
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发表时间:
2023-04
期刊:
影响因子:
44.1
通讯作者:
Sun, Ji
Sun, Ji
中科院分区:
生物学1区
文献类型:
--
作者:
Jiang, Meiqin;Palicharla, Vivek Reddy;Miller, Darcie;Hwang, Sun-Hee;Zhu, Hanwen;Hixson, Patricia;Mukhopadhyay, Saikat;Sun, Ji

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鞭毛内运输(IFT)复合物,IFT- a和IFT- b,形成沿着轴突微管移动的双向序列,对于组装和维持纤毛是必不可少的。IFT亚基的突变导致多种纤毛病涉及多个组织。然而,由于缺乏全息配合物的高分辨率结构信息,对IFT配合物如何组装和介导货物运输缺乏机制理解。在这里,我们报告了在存在和不存在TULP3的情况下,人类IFT-A复合物的冷冻电镜结构,总分辨率为3.0-3.9 Å。IFT-A采用“lariant”形状,核心和外围亚基通过结构上至关重要的锌结合域连接。TULP3,货物适配器,通过其n端区域与IFT-A相互作用,界面突变破坏货物运输。我们还确定了疾病突变对复合体形成和纤毛运输的分子影响。我们的工作揭示了IFT- a结构,揭示了纤毛运输和IFT序列的形成,并使纤毛病的疾病突变合理化。
Intraflagellar transport (IFT) complexes, IFT-A and IFT-B, form bidirectional trains that move along the axonemal microtubules and are essential for assembling and maintaining cilia. Mutations in IFT subunits lead to numerous ciliopathies involving multiple tissues. However, how IFT complexes assemble and mediate cargo transport lacks mechanistic understanding due to missing high-resolution structural information of the holo-complexes. Here we report cryo-EM structures of human IFT-A complexes in the presence and absence of TULP3 at overall resolutions of 3.0–3.9 Å. IFT-A adopts a “lariat” shape with interconnected core and peripheral subunits linked by structurally vital zinc-binding domains. TULP3, the cargo adapter, interacts with IFT-A through its N-terminal region, and interface mutations disrupt cargo transport. We also determine the molecular impacts of disease mutations on complex formation and ciliary transport. Our work reveals IFT-A architecture, sheds light on ciliary transport and IFT train formation, and enables the rationalization of disease mutations in ciliopathies.
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