ジャーナル: Sci Adv / 年: 2020 タイトル: Architecture of the AP2/clathrin coat on the membranes of clathrin-coated vesicles. 著者: Oleksiy Kovtun / Veronica Kane Dickson / Bernard T Kelly / David J Owen / John A G Briggs / 要旨: Clathrin-mediated endocytosis (CME) is crucial for modulating the protein composition of a cell's plasma membrane. Clathrin forms a cage-like, polyhedral outer scaffold around a vesicle, to which ...Clathrin-mediated endocytosis (CME) is crucial for modulating the protein composition of a cell's plasma membrane. Clathrin forms a cage-like, polyhedral outer scaffold around a vesicle, to which cargo-selecting clathrin adaptors are attached. Adaptor protein complex (AP2) is the key adaptor in CME. Crystallography has shown AP2 to adopt a range of conformations. Here, we used cryo-electron microscopy, tomography, and subtomogram averaging to determine structures, interactions, and arrangements of clathrin and AP2 at the key steps of coat assembly, from AP2 in solution to membrane-assembled clathrin-coated vesicles (CCVs). AP2 binds cargo and PtdIns(4,5) (phosphatidylinositol 4,5-bisphosphate)-containing membranes via multiple interfaces, undergoing conformational rearrangement from its cytosolic state. The binding mode of AP2 β2 appendage into the clathrin lattice in CCVs and buds implies how the adaptor structurally modulates coat curvature and coat disassembly.
超分子 #1: Clathrin/AP2 coat assembled on AP2 membrane.
超分子
名称: Clathrin/AP2 coat assembled on AP2 membrane. / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#4 詳細: Clathrin/AP coat was formed on the membrane containing dileucine- and tyrosine-based cargo signal peptides. The AP2 adaptor lacked hinge and appendage regions in its alpha subunit.
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超分子 #2: Clathrin
超分子
名称: Clathrin / タイプ: complex / ID: 2 / 親要素: 1 詳細: Clathrin in the clathrin/AP2 coat formed on the membrane
由来(天然)
生物種: Sus scrofa (ブタ) / 器官: brain
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超分子 #3: AP2
超分子
名称: AP2 / タイプ: complex / ID: 3 / 親要素: 1 詳細: AP2 in clathrin coat formed on membranes containing dileucine- and tyrosine-based cargo peptides
凍結剤: ETHANE / チャンバー内湿度: 98 % / チャンバー内温度: 291 K / 装置: LEICA EM GP 詳細: The sample was supplemented with 10 nm nanogold fiducials, and 3 ul of the mixture was backside blotted for 3 seconds..
詳細
The sample (in vitro budding reaction) contained AP2, clathrin and 400 nm extruded liposomes
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
エネルギーフィルター - 名称: GIF Quantum LS / エネルギーフィルター - スリット幅: 20 eV
撮影
フィルム・検出器のモデル: GATAN K2 QUANTUM (4k x 4k) 検出モード: COUNTING / デジタル化 - サイズ - 横: 3838 pixel / デジタル化 - サイズ - 縦: 3710 pixel / デジタル化 - 画像ごとのフレーム数: 1-10 / 撮影したグリッド数: 2 / 平均露光時間: 0.2 sec. / 平均電子線量: 3.2 e/Å2 詳細: The images were collected in movie mode at 10 frames per second