Biotechnology and Biological Sciences Research Council (BBSRC)
BB/N008391/1
英国
引用
ジャーナル: EMBO J / 年: 2021 タイトル: Multi-modal adaptor-clathrin contacts drive coated vesicle assembly. 著者: Sarah M Smith / Gabrielle Larocque / Katherine M Wood / Kyle L Morris / Alan M Roseman / Richard B Sessions / Stephen J Royle / Corinne J Smith / 要旨: 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-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.
EMPIAR-10783 (タイトル: Multi-modal adaptor-clathrin contacts drive coated vesicle assembly Data size: 25.0 Data #1: Hub subparticles of the 28 mini coat, class 15 [picked particles - single frame - processed])
全体 : Beta2 appendage domain of AP2 bound to terminal domains beneath t...
全体
名称: Beta2 appendage domain of AP2 bound to terminal domains beneath the hub of the 28 triskelia mini clathrin coat complex, class 15
要素
複合体: Beta2 appendage domain of AP2 bound to terminal domains beneath the hub of the 28 triskelia mini clathrin coat complex, class 15
複合体: Clathrin heavy chain
タンパク質・ペプチド: Clathrin heavy chain
複合体: AP-2 complex subunit beta
タンパク質・ペプチド: AP-2 complex subunit beta
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超分子 #1: Beta2 appendage domain of AP2 bound to terminal domains beneath t...
超分子
名称: Beta2 appendage domain of AP2 bound to terminal domains beneath the hub of the 28 triskelia mini clathrin coat complex, class 15 タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
凍結剤: ETHANE-PROPANE / チャンバー内湿度: 90 % / チャンバー内温度: 277.15 K / 装置: LEICA EM GP 詳細: 3 uL of sample applied to a grid and blotted for 4.5 s before plunging.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 平均電子線量: 64.0 e/Å2
This structural model has been updated to include only clathrin terminal domain beta propeller residues that are close to the interface with the beta2 appendage domain.
得られたモデル
PDB-7om8: Beta2 appendage domain of AP2 bound to terminal domains beneath the hub of the 28 triskelia mini clathrin coat complex, class 15