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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9edr | |||||||||||||||
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| タイトル | Tubulin Cofactors D,E,G,C and Tubulin complex -- TBCC N Terminus Bound to Tubulin | |||||||||||||||
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キーワード | CYTOSOLIC PROTEIN / Cytoskeleton / tubulin / tubulin cofactors / microtubules / tubulin biogenesis / tubulin degredation | |||||||||||||||
| 機能・相同性 | 機能・相同性情報post-chaperonin tubulin folding pathway / tubulin complex assembly / small molecule binding / alpha-tubulin binding / beta-tubulin binding / GTPase activator activity / structural constituent of cytoskeleton / microtubule cytoskeleton organization / neuron migration / mitotic cell cycle ...post-chaperonin tubulin folding pathway / tubulin complex assembly / small molecule binding / alpha-tubulin binding / beta-tubulin binding / GTPase activator activity / structural constituent of cytoskeleton / microtubule cytoskeleton organization / neuron migration / mitotic cell cycle / protein folding / microtubule cytoskeleton / molecular adaptor activity / 加水分解酵素; 酸無水物に作用; GTPに作用・細胞または細胞小器官の運動に関与 / microtubule / hydrolase activity / GTPase activity / GTP binding / metal ion binding / cytoplasm 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: 3.8 Å | |||||||||||||||
データ登録者 | Taheri, A. / Al-bassam, J. | |||||||||||||||
| 資金援助 | 米国, 1件
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引用 | ジャーナル: Nat Commun / 年: 2025タイトル: Cryo-EM structures of the tubulin cofactors reveal the molecular basis of alpha/beta-tubulin biogenesis. 著者: Aryan Taheri / Zhoaqian Wang / Bharti Singal / Fei Guo / Jawdat Al-Bassam / ![]() 要旨: Microtubule polarity and dynamic polymerization arise from the self-association properties of the αβ-tubulin heterodimer. For decades, it has remained unclear how the tubulin cofactors TBCD, TBCE, ...Microtubule polarity and dynamic polymerization arise from the self-association properties of the αβ-tubulin heterodimer. For decades, it has remained unclear how the tubulin cofactors TBCD, TBCE, TBCC, and the Arl2 GTPase mediate the biogenesis of αβ-tubulin from individual α- and β-tubulins. Here, we use cryo-electron microscopy to determine structures of tubulin cofactors bound to αβ-tubulin. TBCD, TBCE, and Arl2 form a heterotrimeric cage-like assembly, we term TBC-DEG, around the αβ-tubulin heterodimer. The TBC-DEG-αβ-tubulin structures show that TBC-DEG wraps around β-tubulin while TBCE extends along α-tubulin. The TBC-DEG/TBCC-αβ-tubulin structures reveal that TBCC forms multi-domain interactions with Arl2 and TBCD to engage the αβ-tubulin intradimer-interface, promoting TBCE rotation while TBCD holds β-tubulin. TBCC engages the GTP-bound Arl2, multiple sites of TBCD, and the native αβ-tubulin intradimer interface near the α-tubulin N-site GTP. Together, these structures uncover transition states for αβ-tubulin biogenesis and degradation, suggesting a vise-like, GTP-hydrolysis-dependent mechanism in which TBCC binding to TBC-DEG modulates αβ-tubulin interfaces. Our studies provide structural evidence that tubulin cofactors act as enzymatic regulators that assemble the invariant αβ-tubulin architecture. By catalyzing α- and β-tubulin biogenesis and degradation, the TBC-DEG and TBCC assemblies regulate the polymerization competency of αβ-tubulin for microtubule formation. | |||||||||||||||
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9edr.cif.gz | 845.4 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9edr.ent.gz | 692.9 KB | 表示 | PDB形式 |
| PDBx/mmJSON形式 | 9edr.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
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/ed/9edr ftp://data.pdbj.org/pub/pdb/validation_reports/ed/9edr | HTTPS FTP |
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-関連構造データ
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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
-タンパク質 , 7種, 7分子 DGABCIE
| #1: タンパク質 | 分子量: 117739.406 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: CIN1, YOR349W, O6350 / 発現宿主: ![]() |
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| #2: タンパク質 | 分子量: 22081.746 Da / 分子数: 1 / Mutation: Q73L / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: CIN4, GTP1, UGX1, YMR138W, YM9375.07 / 発現宿主: ![]() |
| #3: タンパク質 | 分子量: 50121.266 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() |
| #4: タンパク質 | 分子量: 49907.770 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() |
| #5: タンパク質 | 分子量: 30750.805 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() 遺伝子: CIN2, YPL241C, P1043 / 発現宿主: ![]() |
| #6: タンパク質 | 分子量: 18866.582 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) ![]() |
| #7: タンパク質 | 分子量: 38682.641 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: Chain E contains a well-resolved C-terminal region that was modeled with full side-chain identities. Density for the LRR and CAP-Gly domains is weaker and discontinuous, consistent with ...詳細: Chain E contains a well-resolved C-terminal region that was modeled with full side-chain identities. Density for the LRR and CAP-Gly domains is weaker and discontinuous, consistent with flexibility of this portion of the protein in the complex. Therefore, residues in these regions are modeled as poly-alanine (listed as UNK in the entry) to represent the backbone trace and overall topology only. Side-chain identities are not asserted in these low-density regions. The sequence register is anchored by the well-resolved C-terminal domain and supported by the AlphaFold prediction.,Chain E contains a well-resolved C-terminal region that was modeled with full side-chain identities. Density for the LRR and CAP-Gly domains is weaker and discontinuous, consistent with flexibility of this portion of the protein in the complex. Therefore, residues in these regions are modeled as poly-alanine (listed as UNK in the entry) to represent the backbone trace and overall topology only. Side-chain identities are not asserted in these low-density regions. The sequence register is anchored by the well-resolved C-terminal domain and supported by the AlphaFold prediction. 由来: (組換発現) ![]() 遺伝子: PAC2, YER007W / 発現宿主: ![]() |
-非ポリマー , 2種, 3分子 


| #8: 化合物 | | #9: 化合物 | ChemComp-GDP / | |
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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: CELL / 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: Complex of tubulin dimer with tubulin cofactors TBCD,E,G,C タイプ: COMPLEX / Entity ID: #1-#7 / 由来: MULTIPLE SOURCES |
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| 由来(天然) | 生物種: ![]() |
| 由来(組換発現) | 生物種: ![]() |
| 緩衝液 | pH: 7 |
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
| 急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
| 顕微鏡 | モデル: TFS GLACIOS |
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| 電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 200 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 1700 nm / 最小 デフォーカス(公称値): 700 nm |
| 撮影 | 電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
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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 | ||||||||||||||||||||||||
| 3次元再構成 | 解像度: 3.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 370000 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 精密化 | 最高解像度: 3.8 Å 立体化学のターゲット値: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS) | ||||||||||||||||||||||||
| 拘束条件 |
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万見について








米国, 1件
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FIELD EMISSION GUN