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基本情報
登録情報 | データベース: PDB / ID: 9c5c | |||||||||||||||||||||||||||||||||||||||||||||
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タイトル | Structure of Human Adaptor Protein Complex AP-3 in the Apo State | |||||||||||||||||||||||||||||||||||||||||||||
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![]() | TRANSPORT PROTEIN / Adaptor Protein complex / AP-3 / Lysosomal transport / Endosomal transport / Protein trafficking | |||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() synaptic vesicle coating / synaptic vesicle budding from endosome / establishment of protein localization to mitochondrial membrane involved in mitochondrial fission / clathrin-coated vesicle cargo loading, AP-3-mediated / skin epidermis development / AP-type membrane coat adaptor complex / synaptic vesicle membrane organization / zinc ion import into lysosome / AP-3 adaptor complex / neurotransmitter receptor transport, postsynaptic endosome to lysosome ...synaptic vesicle coating / synaptic vesicle budding from endosome / establishment of protein localization to mitochondrial membrane involved in mitochondrial fission / clathrin-coated vesicle cargo loading, AP-3-mediated / skin epidermis development / AP-type membrane coat adaptor complex / synaptic vesicle membrane organization / zinc ion import into lysosome / AP-3 adaptor complex / neurotransmitter receptor transport, postsynaptic endosome to lysosome / anterograde synaptic vesicle transport / microvesicle / endosome to melanosome transport / Golgi to vacuole transport / synaptic vesicle recycling / postsynaptic recycling endosome / presynaptic endosome / clathrin adaptor complex / platelet dense granule organization / melanosome assembly / granulocyte differentiation / postsynaptic neurotransmitter receptor internalization / GTP-dependent protein binding / positive regulation of NK T cell differentiation / clathrin-coated vesicle membrane / antigen processing and presentation, exogenous lipid antigen via MHC class Ib / protein targeting to vacuole / protein targeting to lysosome / melanosome organization / respiratory system process / anterograde axonal transport / intracellular zinc ion homeostasis / protein localization to membrane / protein localization to cell surface / lysosome organization / toll-like receptor signaling pathway / Golgi Associated Vesicle Biogenesis / lung morphogenesis / Association of TriC/CCT with target proteins during biosynthesis / homeostasis of number of cells / single fertilization / intracellular transport / hematopoietic progenitor cell differentiation / transport vesicle / vesicle-mediated transport / axon cytoplasm / cytoplasmic vesicle membrane / intracellular protein transport / mRNA transcription by RNA polymerase II / terminal bouton / cell morphogenesis / protein modification process / small GTPase binding / endocytosis / blood coagulation / Signaling by BRAF and RAF1 fusions / insulin receptor signaling pathway / presynapse / cytoplasmic vesicle / protein phosphatase binding / spermatogenesis / early endosome / lysosome / postsynapse / endosome membrane / inflammatory response / Golgi membrane / lysosomal membrane / intracellular membrane-bounded organelle / glutamatergic synapse / Golgi apparatus / positive regulation of transcription by RNA polymerase II / mitochondrion / membrane 類似検索 - 分子機能 | |||||||||||||||||||||||||||||||||||||||||||||
生物種 | ![]() | |||||||||||||||||||||||||||||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.6 Å | |||||||||||||||||||||||||||||||||||||||||||||
Model details | MODEL GENERATED BY ROSETTA VERSION 2020.08+release.cb1caba | |||||||||||||||||||||||||||||||||||||||||||||
![]() | Begley, M.C. / Baker, R.W. | |||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: A structure-based mechanism for initiation of AP-3 coated vesicle formation. 著者: Matthew Begley / Mahira Aragon / Richard W Baker / ![]() 要旨: Adaptor protein complex-3 (AP-3) mediates cargo sorting from endosomes to lysosomes and lysosome-related organelles. Recently, it was shown that AP-3 adopts a constitutively open conformation ...Adaptor protein complex-3 (AP-3) mediates cargo sorting from endosomes to lysosomes and lysosome-related organelles. Recently, it was shown that AP-3 adopts a constitutively open conformation compared to the related AP-1 and AP-2 coat complexes, which are inactive until undergoing large conformational changes upon membrane recruitment. How AP-3 is regulated is therefore an open question. To understand the mechanism of AP-3 membrane recruitment and activation, we reconstituted human AP-3 and determined multiple structures in the soluble and membrane-bound states using electron cryo-microscopy. Similar to yeast AP-3, human AP-3 is in a constitutively open conformation. To reconstitute AP-3 activation by adenosine di-phosphate (ADP)-ribosylation factor 1 (Arf1), a small guanosine tri-phosphate (GTP)ase, we used lipid nanodiscs to build Arf1-AP-3 complexes on membranes and determined three structures showing the stepwise conformational changes required for formation of AP-3 coated vesicles. First, membrane recruitment is driven by one of two predicted Arf1 binding sites, which flexibly tethers AP-3 to the membrane. Second, cargo binding causes AP-3 to adopt a fixed position and rigidifies the complex, which stabilizes binding for a second Arf1 molecule. Finally, binding of the second Arf1 molecule provides the template for AP-3 dimerization, providing a glimpse into the first step of coat polymerization. We propose coat polymerization only occurs after cargo engagement, thereby linking cargo sorting with assembly of higher-order coat structures. Additionally, we provide evidence for two amphipathic helices in AP-3, suggesting that AP-3 contributes to membrane deformation during coat assembly. In total, these data provide evidence for the first stages of AP-3-mediated vesicle coat assembly. | |||||||||||||||||||||||||||||||||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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PDBx/mmCIF形式 | ![]() | 260.3 KB | 表示 | ![]() |
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PDB形式 | ![]() | 205.1 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 45214MC ![]() 9c58C ![]() 9c59C ![]() 9c5aC ![]() 9c5bC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質 | 分子量: 66164.953 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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#2: タンパク質 | 分子量: 65602.797 Da / 分子数: 1 / Mutation: residues 261-293 deleted / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
#3: タンパク質 | 分子量: 14274.275 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
#4: タンパク質 | 分子量: 17412.949 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
Has protein modification | N |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: Human Adaptor Protein Complex AP-3 in the Apo state / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | ||||||||||||||||||||||||||||||
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分子量 | 値: 0.215 MDa / 実験値: NO | ||||||||||||||||||||||||||||||
由来(天然) | 生物種: ![]() | ||||||||||||||||||||||||||||||
由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||||||||||||||||||||
緩衝液 | pH: 7.4 / 詳細: 1x PBS (pH 7.4), 300mM NaCl, 1mM TCEP | ||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 1.5 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Specimen appeared as a monodisperse peak via size exclusion chromatography (SEC) | ||||||||||||||||||||||||||||||
試料支持 | 詳細: Used Quantifoil Active grids- Backside gold coated before plasma cleaned. 12 mA used for plasma cleaning グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
急速凍結 | 装置: SPOTITON / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 296 K / 詳細: Commercialized version - Chameleon |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 1400 nm / 最小 デフォーカス(公称値): 400 nm / Cs: 2.7 mm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 49.97 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 詳細: 4 datasets collected, processed independently, and merged. |
電子光学装置 | エネルギーフィルター名称: TFS Selectris / エネルギーフィルタースリット幅: 20 eV |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 詳細: Mixture of blob picker, template picker, crYOLO, and Topaz | ||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 1205158 / アルゴリズム: FOURIER SPACE / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | Source name: AlphaFold / タイプ: in silico model |