+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 3ktt | ||||||
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タイトル | Atomic model of bovine TRiC CCT2(beta) subunit derived from a 4.0 Angstrom cryo-EM map | ||||||
要素 | T-complex protein 1 subunit beta | ||||||
キーワード | CHAPERONE (シャペロン) / TRiC/CCT / CCT2(beta) / cryo-EM (低温電子顕微鏡法) / Acetylation (アセチル化) / ATP-binding / Cytoplasm (細胞質) / Nucleotide-binding | ||||||
機能・相同性 | 機能・相同性情報 Association of TriC/CCT with target proteins during biosynthesis / RHOBTB1 GTPase cycle / RHOBTB2 GTPase cycle / zona pellucida receptor complex / scaRNA localization to Cajal body / chaperone mediated protein folding independent of cofactor / positive regulation of establishment of protein localization to telomere / chaperonin-containing T-complex / positive regulation of telomerase RNA localization to Cajal body / binding of sperm to zona pellucida ...Association of TriC/CCT with target proteins during biosynthesis / RHOBTB1 GTPase cycle / RHOBTB2 GTPase cycle / zona pellucida receptor complex / scaRNA localization to Cajal body / chaperone mediated protein folding independent of cofactor / positive regulation of establishment of protein localization to telomere / chaperonin-containing T-complex / positive regulation of telomerase RNA localization to Cajal body / binding of sperm to zona pellucida / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Neutrophil degranulation / chaperone-mediated protein complex assembly / positive regulation of telomere maintenance via telomerase / ATP-dependent protein folding chaperone / unfolded protein binding / フォールディング / cell body / 微小管 / protein stabilization / ubiquitin protein ligase binding / ATP hydrolysis activity / ATP binding 類似検索 - 分子機能 | ||||||
生物種 | Bos taurus (ウシ) | ||||||
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 Å | ||||||
データ登録者 | Cong, Y. / Baker, M.L. / Ludtke, S.J. / Frydman, J. / Chiu, W. | ||||||
引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2010 タイトル: 4.0-A resolution cryo-EM structure of the mammalian chaperonin TRiC/CCT reveals its unique subunit arrangement. 著者: Yao Cong / Matthew L Baker / Joanita Jakana / David Woolford / Erik J Miller / Stefanie Reissmann / Ramya N Kumar / Alyssa M Redding-Johanson / Tanveer S Batth / Aindrila Mukhopadhyay / ...著者: Yao Cong / Matthew L Baker / Joanita Jakana / David Woolford / Erik J Miller / Stefanie Reissmann / Ramya N Kumar / Alyssa M Redding-Johanson / Tanveer S Batth / Aindrila Mukhopadhyay / Steven J Ludtke / Judith Frydman / Wah Chiu / 要旨: The essential double-ring eukaryotic chaperonin TRiC/CCT (TCP1-ring complex or chaperonin containing TCP1) assists the folding of approximately 5-10% of the cellular proteome. Many TRiC substrates ...The essential double-ring eukaryotic chaperonin TRiC/CCT (TCP1-ring complex or chaperonin containing TCP1) assists the folding of approximately 5-10% of the cellular proteome. Many TRiC substrates cannot be folded by other chaperonins from prokaryotes or archaea. These unique folding properties are likely linked to TRiC's unique heterooligomeric subunit organization, whereby each ring consists of eight different paralogous subunits in an arrangement that remains uncertain. Using single particle cryo-EM without imposing symmetry, we determined the mammalian TRiC structure at 4.7-A resolution. This revealed the existence of a 2-fold axis between its two rings resulting in two homotypic subunit interactions across the rings. A subsequent 2-fold symmetrized map yielded a 4.0-A resolution structure that evinces the densities of a large fraction of side chains, loops, and insertions. These features permitted unambiguous identification of all eight individual subunits, despite their sequence similarity. Independent biochemical near-neighbor analysis supports our cryo-EM derived TRiC subunit arrangement. We obtained a Calpha backbone model for each subunit from an initial homology model refined against the cryo-EM density. A subsequently optimized atomic model for a subunit showed approximately 95% of the main chain dihedral angles in the allowable regions of the Ramachandran plot. The determination of the TRiC subunit arrangement opens the way to understand its unique function and mechanism. In particular, an unevenly distributed positively charged wall lining the closed folding chamber of TRiC differs strikingly from that of prokaryotic and archaeal chaperonins. These interior surface chemical properties likely play an important role in TRiC's cellular substrate specificity. #1: ジャーナル: To be Published タイトル: To be published 著者: Cong, Y. / Baker, M.L. / Jakana, J. / Woolford, D. / Miller, E.J. / Reissmann, S. / Kumar, R.N. / Redding-Johanson, A.M. / Batth, T.S. / Mukhopadhyay, A. / Ludtke, S.J. / Frydman, J. / Chiu, W. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 3ktt.cif.gz | 96.7 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb3ktt.ent.gz | 74.7 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 3ktt.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/kt/3ktt ftp://data.pdbj.org/pub/pdb/validation_reports/kt/3ktt | HTTPS FTP |
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-関連構造データ
-リンク
-集合体
登録構造単位 |
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対称性 | 点対称性: (シェーンフリース記号: D8 (2回x8回 2面回転対称)) |
-要素
#1: タンパク質 | 分子量: 55107.234 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) Bos taurus (ウシ) / 参照: UniProt: Q3ZBH0 |
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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 | 名称: CCT2(beta) subunit in the both-ring closed bovine TRiC complex タイプ: COMPLEX |
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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 / 詳細: vitrification using ethane as cryogen |
-電子顕微鏡撮影
顕微鏡 | モデル: JEOL 3200FSC / 日付: 2007年8月1日 |
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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 FIELDBright-field microscopy / 倍率(公称値): 50000 X / 最大 デフォーカス(公称値): 3000 nm / 最小 デフォーカス(公称値): 1000 nm / Cs: 4.1 mm |
試料ホルダ | 温度: 101 K / 傾斜角・最大: 0 ° / 傾斜角・最小: 0 ° |
撮影 | 電子線照射量: 18 e/Å2 / フィルム・検出器のモデル: KODAK SO-163 FILM |
-解析
EMソフトウェア |
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CTF補正 | 詳細: FSC at 0.5 cut-off | |||||||||||||||
対称性 | 点対称性: C2 (2回回転対称) | |||||||||||||||
3次元再構成 | 手法: Projection matching / 解像度: 4 Å / 粒子像の数: 101000 / ピクセルサイズ(実測値): 1.2 Å 詳細: Single particle 3D reconstruction using EMAN1.8+ with our recently developed 2-D fast rotation matching method (FRM2D) for the image alignment. 対称性のタイプ: POINT | |||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL 詳細: METHOD--Local refinement, Flexible fitting REFINEMENT PROTOCOL--Local refinement, Flexible fitting | |||||||||||||||
原子モデル構築 | 詳細: Homology model | |||||||||||||||
精密化ステップ | サイクル: LAST
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