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基本情報
登録情報 | データベース: PDB / ID: 5flz | ||||||
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タイトル | Cryo-EM structure of gamma-TuSC oligomers in a closed conformation | ||||||
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![]() | CELL CYCLE / MICROTUBULE NUCLEATION | ||||||
機能・相同性 | ![]() inner plaque of spindle pole body / microtubule nucleation by spindle pole body / outer plaque of spindle pole body / gamma-tubulin small complex / regulation of microtubule nucleation / mitotic spindle pole body / equatorial microtubule organizing center / gamma-tubulin complex / meiotic spindle organization / microtubule nucleation ...inner plaque of spindle pole body / microtubule nucleation by spindle pole body / outer plaque of spindle pole body / gamma-tubulin small complex / regulation of microtubule nucleation / mitotic spindle pole body / equatorial microtubule organizing center / gamma-tubulin complex / meiotic spindle organization / microtubule nucleation / positive regulation of cytoplasmic translation / gamma-tubulin binding / spindle pole body / mitotic sister chromatid segregation / spindle assembly / cytoplasmic microtubule organization / mitotic spindle organization / meiotic cell cycle / structural constituent of cytoskeleton / spindle pole / spindle / mitotic cell cycle / microtubule / GTP binding / nucleus / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 6.9 Å | ||||||
![]() | Greenberg, C.H. / Kollman, J. / Zelter, A. / Johnson, R. / MacCoss, M.J. / Davis, T.N. / Agard, D.A. / Sali, A. | ||||||
![]() | ![]() タイトル: Structure of γ-tubulin small complex based on a cryo-EM map, chemical cross-links, and a remotely related structure. 著者: Charles H Greenberg / Justin Kollman / Alex Zelter / Richard Johnson / Michael J MacCoss / Trisha N Davis / David A Agard / Andrej Sali / ![]() 要旨: Modeling protein complex structures based on distantly related homologues can be challenging due to poor sequence and structure conservation. Therefore, utilizing even low-resolution experimental ...Modeling protein complex structures based on distantly related homologues can be challenging due to poor sequence and structure conservation. Therefore, utilizing even low-resolution experimental data can significantly increase model precision and accuracy. Here, we present models of the two key functional states of the yeast γ-tubulin small complex (γTuSC): one for the low-activity "open" state and another for the higher-activity "closed" state. Both models were computed based on remotely related template structures and cryo-EM density maps at 6.9Å and 8.0Å resolution, respectively. For each state, extensive sampling of alignments and conformations was guided by the fit to the corresponding cryo-EM density map. The resulting good-scoring models formed a tightly clustered ensemble of conformations in most regions. We found significant structural differences between the two states, primarily in the γ-tubulin subunit regions where the microtubule binds. We also report a set of chemical cross-links that were found to be consistent with equilibrium between the open and closed states. The protocols developed here have been incorporated into our open-source Integrative Modeling Platform (IMP) software package (http://integrativemodeling.org), and can therefore be applied to many other systems. #1: ![]() タイトル: Ring closure activates yeast γTuRC for species-specific microtubule nucleation. 著者: Justin M Kollman / Charles H Greenberg / Sam Li / Michelle Moritz / Alex Zelter / Kimberly K Fong / Jose-Jesus Fernandez / Andrej Sali / John Kilmartin / Trisha N Davis / David A Agard / ![]() ![]() ![]() 要旨: The γ-tubulin ring complex (γTuRC) is the primary microtubule nucleator in cells. γTuRC is assembled from repeating γ-tubulin small complex (γTuSC) subunits and is thought to function as a ...The γ-tubulin ring complex (γTuRC) is the primary microtubule nucleator in cells. γTuRC is assembled from repeating γ-tubulin small complex (γTuSC) subunits and is thought to function as a template by presenting a γ-tubulin ring that mimics microtubule geometry. However, a previous yeast γTuRC structure showed γTuSC in an open conformation that prevents matching to microtubule symmetry. By contrast, we show here that γ-tubulin complexes are in a closed conformation when attached to microtubules. To confirm the functional importance of the closed γTuSC ring, we trapped the closed state and determined its structure, showing that the γ-tubulin ring precisely matches microtubule symmetry and providing detailed insight into γTuRC architecture. Importantly, the closed state is a stronger nucleator, thus suggesting that this conformational switch may allosterically control γTuRC activity. Finally, we demonstrate that γTuRCs have a strong preference for tubulin from the same species. | ||||||
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構造の表示
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構造ビューア | 分子: ![]() ![]() |
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PDBx/mmCIF形式 | ![]() | 3.4 MB | 表示 | ![]() |
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PDB形式 | ![]() | 2.8 MB | 表示 | ![]() |
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-検証レポート
文書・要旨 | ![]() | 1.3 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 2.2 MB | 表示 | |
XML形式データ | ![]() | 487.2 KB | 表示 | |
CIF形式データ | ![]() | 720.3 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-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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モデル数 | 10 |
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要素
#1: タンパク質 | 分子量: 96940.594 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 発現宿主: ![]() | ||||
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#2: タンパク質 | 分子量: 98336.211 Da / 分子数: 1 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() 発現宿主: ![]() | ||||
#3: タンパク質 | 分子量: 52733.340 Da / 分子数: 2 / Mutation: YES / 由来タイプ: 組換発現 詳細: CYSTEINE RESIDUES WERE INTRODUCED AT POSITIONS 58 AND 288 TO PROMOTE CROSSLINKING OF THE HELICAL COMPLEX 由来: (組換発現) ![]() ![]() 発現宿主: ![]() #4: タンパク質・ペプチド | 分子量: 3762.629 Da / 分子数: 2 / 由来タイプ: 組換発現 詳細: RESIDUES 1-220 OF SPC110 WERE EXPRESSED WITH AN N-TERMINAL GST TAG, WHICH WAS CLEAVED OFF DURING PURIFICATION. IT CANNOT BE UNIQUELY IDENTIFIED WHICH FRAGMENT OF SPC110 IS PRESENT IN THE MAP, ...詳細: RESIDUES 1-220 OF SPC110 WERE EXPRESSED WITH AN N-TERMINAL GST TAG, WHICH WAS CLEAVED OFF DURING PURIFICATION. IT CANNOT BE UNIQUELY IDENTIFIED WHICH FRAGMENT OF SPC110 IS PRESENT IN THE MAP, THUS A POLY-ALANINE HELIX WAS FITTED INTO THE MAP. 由来: (組換発現) ![]() ![]() 発現宿主: ![]() 配列の詳細 | CONTAINS TWO MUTATIONS TO FORCE CLOSURE, S58C AND G288C CHAINS E AND F CORRESPOND | |
-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: FILAMENT / 3次元再構成法: らせん対称体再構成法 |
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試料調製
構成要素 | 名称: RECOMBINANT YEAST GAMMA- TUSC MUTANT S58C G288C / タイプ: COMPLEX |
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緩衝液 | 名称: 40 MM HEPES PH 7.6, 100 MM KCL, 1 MM EGTA, 1MM MGCL2, 1 MM OXIDIZED GLUTATHIONE pH: 7.6 詳細: 40 MM HEPES PH 7.6, 100 MM KCL, 1 MM EGTA, 1MM MGCL2, 1 MM OXIDIZED GLUTATHIONE |
試料 | 濃度: 2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | 詳細: OTHER |
急速凍結 | 装置: FEI VITROBOT MARK I / 凍結剤: ETHANE 詳細: CRYOGEN- ETHANE, HUMIDITY- 90, INSTRUMENT- FEI VITROBOT MARK I, METHOD- BLOT FOR 2-5 SECONDS BEFORE PLUNGING, |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Tecnai F20 / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TECNAI F20 / 日付: 2011年5月25日 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(補正後): 94000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 800 nm / Cs: 2.12 mm |
撮影 | 電子線照射量: 20 e/Å2 フィルム・検出器のモデル: TVIPS TEMCAM-F816 (8k x 8k) |
画像スキャン | デジタル画像の数: 364 |
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解析
EMソフトウェア |
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CTF補正 | 詳細: EACH MICROGRAPH | |||||||||||||||||||||||||||||||||||
3次元再構成 | 手法: REFERENCE MATCHING / 解像度: 6.9 Å 詳細: INITIAL MODELS WERE GENERATED WITH MODELER 9.15 BASED ON PDB ENTRIES 3RIP (FOR GCP2 AND GCP3) AND 3CB2 (FOR GAMMA TUBULIN). TWO COMPLETE GAMMA-TUSC STRUCTURES WERE MODELED SIMULTANEOUSLY, ...詳細: INITIAL MODELS WERE GENERATED WITH MODELER 9.15 BASED ON PDB ENTRIES 3RIP (FOR GCP2 AND GCP3) AND 3CB2 (FOR GAMMA TUBULIN). TWO COMPLETE GAMMA-TUSC STRUCTURES WERE MODELED SIMULTANEOUSLY, RIGIDLY FITTED INTO THE CRYO-EM MAP WITH UCSF CHIMERA, THEN FLEXIBLY FITTED WITH MDFF. ADDITIONAL SECONDARY STRUCTURE AND SYMMETRY RESTRAINTS WERE ADDED. FINAL VALIDATION PERFORMED WITH THE INTEGRATIVE MODELING PLATFORM. FOR DETAILS, ALL CODE IS DEPOSITED AT GITHUB.COM/INTEGRATIVEMODELING/GAMMA-TUSC SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2799. (DEPOSITION ID: 12869). 対称性のタイプ: HELICAL | |||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / 詳細: METHOD--FLEXIBLE FITTING | |||||||||||||||||||||||||||||||||||
精密化 | 最高解像度: 6.9 Å | |||||||||||||||||||||||||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 6.9 Å
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