Multi-modal adaptor-clathrin contacts drive coated vesicle assembly.

Multi-modal adaptor-clathrin contacts drive coated vesicle assembly.
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DOI:
10.15252/embj.2021108795
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发表时间:
2021-10-01
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Smith CJ
Smith CJ
中科院分区:
其他
文献类型:
--
作者:
Smith SM;Larocque G;Wood KM;Morris KL;Roseman AM;Sessions RB;Royle SJ;Smith CJ

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网格蛋白包被的凹坑是通过AP 2复合物识别膜和货物以及随后招募网格蛋白三聚体形成的。尚未探索AP 2在初始网格蛋白募集以外的包被窝组装中的作用。网格蛋白与AP 2的β2亚基结合,并且已经鉴定了几个结合位点,但我们对这些相互作用的结构知识不完整,并且它们在胞吞过程中的功能重要性尚不清楚。在此,我们分析了在存在β2铰链附件(β 2 HA)的情况下组装的网格蛋白笼的冷冻电镜结构。我们发现β2-附件在笼中至少两个位置结合,表明多模式结合是网格蛋白-AP 2相互作用的基本性质。在一个位置上,β2-附件交联来自不同三聚体的两个相邻末端结构域。β 2 HA-网格蛋白相互作用的功能分析表明,内吞作用需要两个网格蛋白相互作用位点:铰链上的网格蛋白-盒基序和附件上的“三明治位点”。我们认为,β2-附属物与一个以上的三聚体结合是该系统的一个关键特征,这可能解释了为什么组装是由AP 2驱动的。单颗粒冷冻-EM分析揭示了衔接蛋白2如何通过在笼中不同位置交联网格蛋白三聚体来促进内吞作用期间的网格蛋白组装。
Clathrin‐coated pits are formed by the recognition of membrane and cargo by the AP2 complex and the subsequent recruitment of clathrin triskelia. A role for AP2 in coated‐pit assembly beyond initial clathrin recruitment has not been explored. Clathrin binds the β2 subunit of AP2, and several binding sites have been identified, but our structural knowledge of these interactions is incomplete and their functional importance during endocytosis is unclear. Here, we analysed the cryo‐EM structure of clathrin cages assembled in the presence of β2 hinge‐appendage (β2HA). We find that the β2‐appendage binds in at least two positions in the cage, demonstrating that multi‐modal binding is a fundamental property of clathrin‐AP2 interactions. In one position, β2‐appendage cross‐links two adjacent terminal domains from different triskelia. Functional analysis of β2HA‐clathrin interactions reveals that endocytosis requires two clathrin interaction sites: a clathrin‐box motif on the hinge and the “sandwich site” on the appendage. We propose that β2‐appendage binding to more than one triskelion is a key feature of the system and likely explains why assembly is driven by AP2. Single particle cryo‐EM analysis reveals how Adaptor Protein 2 promotes clathrin assembly during endocytosis by crosslinking clathrin triskelia at different locations in the cage.
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