+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 8uxw | ||||||||||||
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タイトル | Arp2/3 branch junction complex, ADP state | ||||||||||||
要素 |
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キーワード | CYTOSOLIC PROTEIN / actin / arp2/3 / cytoskeleton / branch | ||||||||||||
機能・相同性 | 機能・相同性情報 Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / actin cortical patch organization / Clathrin-mediated endocytosis / Neutrophil degranulation / medial cortex / cell cortex of cell tip / actin cortical patch assembly / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation ...Regulation of actin dynamics for phagocytic cup formation / RHO GTPases Activate WASPs and WAVEs / actin cortical patch organization / Clathrin-mediated endocytosis / Neutrophil degranulation / medial cortex / cell cortex of cell tip / actin cortical patch assembly / Arp2/3 protein complex / Arp2/3 complex-mediated actin nucleation / actin cortical patch / cell tip / regulation of actin filament polymerization / mating projection tip / cortical actin cytoskeleton organization / cytoskeletal motor activator activity / establishment or maintenance of cell polarity / tropomyosin binding / mesenchyme migration / troponin I binding / cell division site / myosin heavy chain binding / filamentous actin / actin filament bundle / skeletal muscle thin filament assembly / striated muscle thin filament / actin filament bundle assembly / skeletal muscle myofibril / mitotic cytokinesis / actin monomer binding / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / actin filament / 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 / structural constituent of cytoskeleton / endocytosis / calcium-dependent protein binding / actin filament binding / lamellipodium / cell body / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein binding / nucleus / cytoplasm / cytosol 類似検索 - 分子機能 | ||||||||||||
生物種 | Schizosaccharomyces pombe (分裂酵母) Oryctolagus cuniculus (ウサギ) | ||||||||||||
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: 2.7 Å | ||||||||||||
データ登録者 | Chavali, S.S. / Chou, S.Z. / Sindelar, C.V. | ||||||||||||
資金援助 | 米国, 3件
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引用 | ジャーナル: Nat Commun / 年: 2024 タイトル: Cryo-EM structures reveal how phosphate release from Arp3 weakens actin filament branches formed by Arp2/3 complex. 著者: Sai Shashank Chavali / Steven Z Chou / Wenxiang Cao / Thomas D Pollard / Enrique M De La Cruz / Charles V Sindelar / 要旨: Arp2/3 complex nucleates branched actin filaments for cell and organelle movements. Here we report a 2.7 Å resolution cryo-EM structure of the mature branch junction formed by S. pombe Arp2/3 ...Arp2/3 complex nucleates branched actin filaments for cell and organelle movements. Here we report a 2.7 Å resolution cryo-EM structure of the mature branch junction formed by S. pombe Arp2/3 complex that provides details about interactions with both mother and daughter filaments. We determine a second structure at 3.2 Å resolution with the phosphate analog BeF bound with ADP to Arp3 and ATP bound to Arp2. In this ADP-BeF transition state the outer domain of Arp3 is rotated 2° toward the mother filament compared with the ADP state and makes slightly broader contacts with actin in both the mother and daughter filaments. Thus, dissociation of P from the ADP-P transition state reduces the interactions of Arp2/3 complex with the actin filaments and may contribute to the lower mechanical stability of mature branch junctions with ADP bound to the Arps. Our structures also reveal that the mother filament in contact with Arp2/3 complex is slightly bent and twisted, consistent with the preference of Arp2/3 complex binding curved actin filaments. The small degree of twisting constrains models of actin filament mechanics. | ||||||||||||
履歴 |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 8uxw.cif.gz | 1.5 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb8uxw.ent.gz | 1.3 MB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 8uxw.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 8uxw_validation.pdf.gz | 2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 8uxw_full_validation.pdf.gz | 2 MB | 表示 | |
XML形式データ | 8uxw_validation.xml.gz | 135.4 KB | 表示 | |
CIF形式データ | 8uxw_validation.cif.gz | 207.4 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ux/8uxw ftp://data.pdbj.org/pub/pdb/validation_reports/ux/8uxw | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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-要素
-Actin-related protein ... , 7種, 7分子 ABCDEFG
#1: タンパク質 | 分子量: 47427.137 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: P32390 |
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#2: タンパク質 | 分子量: 44286.758 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: Q9UUJ1 |
#3: タンパク質 | 分子量: 41643.465 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: P78774 |
#4: タンパク質 | 分子量: 37025.230 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: O14241 |
#5: タンパク質 | 分子量: 19865.746 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: Q9Y7J4 |
#6: タンパク質 | 分子量: 19637.695 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: Q92352 |
#7: タンパク質 | 分子量: 16922.059 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Schizosaccharomyces pombe (分裂酵母) / 参照: UniProt: Q10316 |
-タンパク質 , 1種, 8分子 HIMNOPQR
#8: タンパク質 | 分子量: 42109.973 Da / 分子数: 8 / 由来タイプ: 天然 / 由来: (天然) Oryctolagus cuniculus (ウサギ) 参照: UniProt: P68135, 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 |
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-非ポリマー , 3種, 20分子
#9: 化合物 | ChemComp-ADP / #10: 化合物 | ChemComp-MG / #11: 化合物 | ChemComp-ATP / | |
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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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-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 |
-試料調製
構成要素 |
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由来(天然) |
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緩衝液 | pH: 7.5 | ||||||||||||||||||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Actin monomers with bound Ca2+ were converted to Mg2+-actin by equilibrating with 50 micromolar MgCl2 and 0.2 mM EGTA (pH 7.5) for 10 min on ice. Actin was polymerized in the presence of ...詳細: Actin monomers with bound Ca2+ were converted to Mg2+-actin by equilibrating with 50 micromolar MgCl2 and 0.2 mM EGTA (pH 7.5) for 10 min on ice. Actin was polymerized in the presence of capping protein (CP) by sequentially mixing 8.75 micromolar Mg-ATP-actin monomers with 0.75 micromolar CP and equilibrated at room temperature for 1 h. In parallel, Arp2/3 complex (0.4 micromolar) in QB buffer was activated by mixing 0.85 micromolar GCN4-VCA and 50 micromolar ATP and incubated at 4 degrees for 1 h. The capped actin filaments sample was then gently mixed with an equal volume of activated Arp2/3 complex sample using cut pipette tips and equilibrated at 4 degrees for 5 min. Daughter filaments were formed and elongated in the presence of CP by adding 0.25 micromolar Mg-actin monomers, 50 micromolar ATP, and 40 nM CP and incubated for 5 min at room temperature. This step was subsequently repeated 4 more times, then aged for ~90 min before preparing grids for cryo-EM data collection. | ||||||||||||||||||||||||||||
試料支持 | 詳細: Grids were not glow discharged / グリッドの材料: GOLD / 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: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277 K 詳細: The samples were incubated on the grid for 50 s and the extra solution was blotted using two Vitrobot filter papers (0.55/20 mm, Grade 595, Ted Pella) for 4 s at 0 blot force. The grids were ...詳細: The samples were incubated on the grid for 50 s and the extra solution was blotted using two Vitrobot filter papers (0.55/20 mm, Grade 595, Ted Pella) for 4 s at 0 blot force. The grids were plunged into liquid ethane at ~180 degrees C with a wait time of 0.5 s. |
-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 詳細: The vitrified grids were screened for sample homogeneity and ice thickness in a Glacios 200 kV transmission electron microscope equipped with Gatan K2 summit camera. Electron micrographs for ...詳細: The vitrified grids were screened for sample homogeneity and ice thickness in a Glacios 200 kV transmission electron microscope equipped with Gatan K2 summit camera. Electron micrographs for image reconstructions were collected using Titan Krios equipped with X-cold field emission gun at 300 kV, Gatan image filter with slit width of 20 eV and a nanoprobe. |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 64000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1200 nm / Cs: 2.7 mm |
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 | 平均露光時間: 3.3 sec. / 電子線照射量: 51.4 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 実像数: 8519 詳細: Each movie contains 41 frames with a frame time of 0.08 s. A dose rate of 28.4 counts/pixel/s and a physical pixel size of 1.346 Angstroms was used. |
電子光学装置 | エネルギーフィルター名称: GIF Quantum LS 詳細: Electron micrographs for image reconstructions were collected using Titan Krios equipped with X-cold field emission gun at 300 kV, Gatan image filter with slit width of 20 eV and a nanoprobe. エネルギーフィルタースリット幅: 20 eV |
-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 | 選択した粒子像数: 3000000 | ||||||||||||||||||||
3次元再構成 | 解像度: 2.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 400000 / 対称性のタイプ: POINT |