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基本情報
登録情報 | データベース: PDB / ID: 9c5a | ||||||||||||||||||||||||||||||||||||||||||||||||
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タイトル | AP-3 Arf1 dimeric interface, focused refinement | ||||||||||||||||||||||||||||||||||||||||||||||||
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![]() | TRANSPORT PROTEIN / Adaptor Protein complex / Endosomal Trafficking / Lysosomal Trafficking / Protein transport / AP complex | ||||||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() establishment of protein localization to mitochondrial membrane involved in mitochondrial fission / clathrin-coated vesicle cargo loading, AP-3-mediated / skin epidermis development / regulation of organelle transport along microtubule / AP-3 adaptor complex / positive regulation of natural killer cell degranulation / anterograde synaptic vesicle transport / granzyme-mediated programmed cell death signaling pathway / phagolysosome membrane / microvesicle ...establishment of protein localization to mitochondrial membrane involved in mitochondrial fission / clathrin-coated vesicle cargo loading, AP-3-mediated / skin epidermis development / regulation of organelle transport along microtubule / AP-3 adaptor complex / positive regulation of natural killer cell degranulation / anterograde synaptic vesicle transport / granzyme-mediated programmed cell death signaling pathway / phagolysosome membrane / microvesicle / Golgi to lysosome transport / mitotic cleavage furrow ingression / trans-Golgi Network Vesicle Budding / establishment of protein localization to organelle / cytolytic granule membrane / postsynaptic recycling endosome / clathrin adaptor complex / platelet dense granule organization / Glycosphingolipid transport / regulation of receptor internalization / melanosome assembly / granulocyte differentiation / Intra-Golgi traffic / regulation of Arp2/3 complex-mediated actin nucleation / postsynaptic neurotransmitter receptor internalization / GTP-dependent protein binding / positive regulation of NK T cell differentiation / Synthesis of PIPs at the Golgi membrane / clathrin-coated vesicle membrane / lysosomal lumen acidification / positive regulation of natural killer cell mediated cytotoxicity / antigen processing and presentation, exogenous lipid antigen via MHC class Ib / protein targeting to lysosome / melanosome organization / respiratory system process / anterograde axonal transport / Nef Mediated CD4 Down-regulation / intracellular zinc ion homeostasis / dendritic spine organization / protein localization to cell surface / long-term synaptic depression / azurophil granule membrane / lysosome organization / COPI-dependent Golgi-to-ER retrograde traffic / Lysosome Vesicle Biogenesis / toll-like receptor signaling pathway / ion channel inhibitor activity / Golgi Associated Vesicle Biogenesis / cell leading edge / lung morphogenesis / Association of TriC/CCT with target proteins during biosynthesis / Synthesis of PIPs at the plasma membrane / autolysosome / autophagosome membrane / ficolin-1-rich granule membrane / homeostasis of number of cells / intracellular copper ion homeostasis / single fertilization / intracellular transport / hematopoietic progenitor cell differentiation / COPI-mediated anterograde transport / vesicle-mediated transport / axon cytoplasm / multivesicular body / MHC class II antigen presentation / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / cytoplasmic vesicle membrane / sarcomere / small monomeric GTPase / intracellular protein transport / mRNA transcription by RNA polymerase II / cell morphogenesis / sarcolemma / protein modification process / small GTPase binding / cellular response to virus / endocytosis / blood coagulation / Signaling by BRAF and RAF1 fusions / late endosome membrane / late endosome / synaptic vesicle / melanosome / virus receptor activity / cytoplasmic vesicle / protein phosphatase binding / spermatogenesis / early endosome / lysosome / neuron projection / postsynaptic density / protein stabilization / endosome membrane / inflammatory response / protein domain specific binding / Golgi membrane / external side of plasma membrane / lysosomal membrane / focal adhesion / GTPase activity 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: 4.2 Å | ||||||||||||||||||||||||||||||||||||||||||||||||
![]() | 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 | ![]() | 367 KB | 表示 | ![]() |
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PDB形式 | ![]() | 289.8 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 | ![]() 45209MC ![]() 9c58C ![]() 9c59C ![]() 9c5bC ![]() 9c5cC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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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
-AP-3 complex subunit ... , 2種, 4分子 BbMm
#1: タンパク質 | 分子量: 77286.523 Da / 分子数: 2 / 断片: residues 1-677 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #2: タンパク質 | 分子量: 46989.965 Da / 分子数: 2 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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-タンパク質 / タンパク質・ペプチド , 2種, 4分子 CcYy
#3: タンパク質 | 分子量: 20775.812 Da / 分子数: 2 / Mutation: Q71L / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() #4: タンパク質・ペプチド | 分子量: 1377.553 Da / 分子数: 2 / 断片: C-terminal cytoplasmic tail / 由来タイプ: 合成 / 由来: (合成) ![]() |
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-非ポリマー , 2種, 4分子 


#5: 化合物 | #6: 化合物 | |
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-詳細
研究の焦点であるリガンドがあるか | Y |
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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: AP-3 Arf1 dimeric interface, focused refinement / タイプ: COMPLEX / Entity ID: #1-#4 / 由来: MULTIPLE SOURCES | |||||||||||||||||||||||||||||||||||||||||||||
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分子量 | 値: 0.256 MDa / 実験値: YES | |||||||||||||||||||||||||||||||||||||||||||||
緩衝液 | pH: 7.4 詳細: 1x PBS (pH 7.4), 150mM NaCl, 1mM TCEP, 2mM GTP, 5mM EDTA, 10mM MgCl2 | |||||||||||||||||||||||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: AP-3 dimer bound to myristoylated Arf1 (Q71L) and LAMP1 on a lipid nanodisc; focused refinement on Arf1 dimeric interface | |||||||||||||||||||||||||||||||||||||||||||||
試料支持 | 詳細: Quantifoil Active grids (SPT Labtech) with backside gold coated. Plasma was 12mA for 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: 294 K / 詳細: Commercial form of the chameleon (SPT Labtech) |
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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: TFS KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 81000 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 |
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: 53.37 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) 詳細: 2 datasets collected independently and merged for processing |
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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 | ||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C2 (2回回転対称) | ||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 4.2 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 122155 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: AB INITIO MODEL | ||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | Source name: AlphaFold / タイプ: in silico model |