Early steps in primary cilium assembly require EHD1/EHD3-dependent ciliary vesicle formation.

Early steps in primary cilium assembly require EHD1/EHD3-dependent ciliary vesicle formation.
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DOI:
10.1038/ncb3109
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发表时间:
2015-03
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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与母中心粒(m -中心粒)远端附着物的膜结合是纤毛发生起始的关键。Rab GTPase Rab11-Rab8级联如何在早期纤毛膜组装中起作用尚不清楚。在这里,我们发现膜形成蛋白EHD1和EHD3与Rab11-Rab8级联有关,在早期纤毛发生中起作用。EHD1和EHD3定位于纤毛前膜和纤毛袋。ehd依赖的膜管是纤毛囊(CV)由较小的远端附件囊(DAV)形成的必要条件。重要的是,这一步骤在m -中心粒到基底体的转化和过渡区蛋白和IFT20的募集中起作用。SNAP29是一种SNARE膜融合调节剂和ehd1结合蛋白,也是dav介导的CV组装所必需的。有趣的是,只有在CV组装后,Rab8才被激活以促进纤毛生长。我们的研究揭示了先前未被描述的纤毛发生步骤的分子机制,即EHD1和EHD3在纤毛膜和轴突协调生长之前重组m -中心粒和相关DAV。
Membrane association with mother centriole (M-centriole) distal appendages is critical for ciliogenesis initiation. How the Rab GTPase Rab11-Rab8 cascade functions in early ciliary membrane assembly is unknown. Here, we show that the membrane shaping proteins EHD1 and EHD3, in association with the Rab11-Rab8 cascade, function in early ciliogenesis. EHD1 and EHD3 localize to pre-ciliary membranes and the ciliary pocket. EHD-dependent membrane tubulation is essential for ciliary vesicle (CV) formation from smaller distal appendage vesicles (DAV). Importantly, this step functions in M-centriole to basal body transformation and recruitment of transition zone proteins and IFT20. SNAP29, a SNARE membrane fusion regulator and EHD1-binding protein, is also required for DAV-mediated CV assembly. Interestingly, only after CV assembly is Rab8 activated for ciliary growth. Our studies uncover molecular mechanisms informing a previously uncharacterized ciliogenesis step whereby EHD1 and EHD3 reorganize the M-centriole and associated DAV prior to coordinated ciliary membrane and axoneme growth.
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