+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 5fm1 | ||||||
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タイトル | Structure of gamma-tubulin small complex based on a cryo-EM map, chemical cross-links, and a remotely related structure | ||||||
要素 |
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キーワード | CELL CYCLE / MICROTUBULE / NUCLEATION / TUBULIN / FILAMENT | ||||||
機能・相同性 | 機能・相同性情報 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 / meiotic spindle organization / gamma-tubulin complex / 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 / meiotic spindle organization / gamma-tubulin complex / 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 | SACCHAROMYCES CEREVISIAE (パン酵母) | ||||||
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: 8 Å | ||||||
データ登録者 | Greenberg, C.H. / Kollman, J. / Zelter, A. / Johnson, R. / MacCoss, M.J. / Davis, T.N. / Agard, D.A. / Sali, A. | ||||||
引用 | ジャーナル: J Struct Biol / 年: 2016 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: ジャーナル: Nature / 年: 2010 タイトル: Microtubule nucleating gamma-TuSC assembles structures with 13-fold microtubule-like symmetry. 著者: Justin M Kollman / Jessica K Polka / Alex Zelter / Trisha N Davis / David A Agard / 要旨: Microtubules are nucleated in vivo by gamma-tubulin complexes. The 300-kDa gamma-tubulin small complex (gamma-TuSC), consisting of two molecules of gamma-tubulin and one copy each of the accessory ...Microtubules are nucleated in vivo by gamma-tubulin complexes. The 300-kDa gamma-tubulin small complex (gamma-TuSC), consisting of two molecules of gamma-tubulin and one copy each of the accessory proteins Spc97 and Spc98, is the conserved, essential core of the microtubule nucleating machinery. In metazoa multiple gamma-TuSCs assemble with other proteins into gamma-tubulin ring complexes (gamma-TuRCs). The structure of gamma-TuRC indicated that it functions as a microtubule template. Because each gamma-TuSC contains two molecules of gamma-tubulin, it was assumed that the gamma-TuRC-specific proteins are required to organize gamma-TuSCs to match 13-fold microtubule symmetry. Here we show that Saccharomyces cerevisiae gamma-TuSC forms rings even in the absence of other gamma-TuRC components. The yeast adaptor protein Spc110 stabilizes the rings into extended filaments and is required for oligomer formation under physiological buffer conditions. The 8-A cryo-electron microscopic reconstruction of the filament reveals 13 gamma-tubulins per turn, matching microtubule symmetry, with plus ends exposed for interaction with microtubules, implying that one turn of the filament constitutes a microtubule template. The domain structures of Spc97 and Spc98 suggest functions for conserved sequence motifs, with implications for the gamma-TuRC-specific proteins. The gamma-TuSC filaments nucleate microtubules at a low level, and the structure provides a strong hypothesis for how nucleation is regulated, converting this less active form to a potent nucleator. | ||||||
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 | 5fm1.cif.gz | 3.3 MB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb5fm1.ent.gz | 2.8 MB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 5fm1.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 | 5fm1_validation.pdf.gz | 1.2 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 5fm1_full_validation.pdf.gz | 2.2 MB | 表示 | |
XML形式データ | 5fm1_validation.xml.gz | 490.6 KB | 表示 | |
CIF形式データ | 5fm1_validation.cif.gz | 724.8 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/fm/5fm1 ftp://data.pdbj.org/pub/pdb/validation_reports/fm/5fm1 | 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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1 |
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モデル数 | 10 |
-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) SACCHAROMYCES CEREVISIAE (パン酵母) プラスミド: PDV45 発現宿主: SPODOPTERA FRUGIPERDA (ツマジロクサヨトウ) 参照: UniProt: P38863 | ||||
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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) SACCHAROMYCES CEREVISIAE (パン酵母) プラスミド: PDV45 発現宿主: SPODOPTERA FRUGIPERDA (ツマジロクサヨトウ) 参照: UniProt: P53540 | ||||
#3: タンパク質 | 分子量: 52671.188 Da / 分子数: 2 / 由来タイプ: 組換発現 由来: (組換発現) SACCHAROMYCES CEREVISIAE (パン酵母) プラスミド: PDV45 発現宿主: SPODOPTERA FRUGIPERDA (ツマジロクサヨトウ) 参照: UniProt: P53378 #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: CONSTRUCT INCLUDES THE FIRST 220 RESIDUES OF SPC110P IT CANNOT BE UNIQUELY IDENTIFIED WHICH FRAGMENT OF SPC110 IS PRESENT IN THE MAP, THUS A POLY-ALANINE HELIX WAS FITTED. 由来: (組換発現) SACCHAROMYCES CEREVISIAE (パン酵母) プラスミド: PDV45 発現宿主: SPODOPTERA FRUGIPERDA (ツマジロクサヨトウ) 配列の詳細 | ONLY RESIDUES 1-220 INCLUDED IN STRUCTURE. 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 |
-試料調製
構成要素 | 名称: GAMMA TUBULIN SMALL COMPLEX / タイプ: COMPLEX |
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緩衝液 | 名称: 100 MM KCL, 1MM GTP, 1MM MGCL2, 2MM EGTA, 40 MM HEPES pH: 7.6 詳細: 100 MM KCL, 1MM GTP, 1MM MGCL2, 2MM EGTA, 40 MM HEPES |
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: LIQUID ETHANE |
-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: 2009年9月23日 |
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 / 倍率(公称値): 60000 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): 800 nm / Cs: 2.2 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) |
-解析
EMソフトウェア |
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CTF補正 | 詳細: WHOLE MICROGRAPH | |||||||||||||||
3次元再構成 | 手法: ITERATIVE HELICAL REAL SPACE RECONSTRUCTION / 解像度: 8 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. COMSLASHINTEGRATIVEMODELINGSLASHGAMMA-TUSC SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-1731. (DEPOSITION ID: 7273). 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 REFINEMENT PROTOCOL--X-RAY | |||||||||||||||
精密化 | 最高解像度: 8 Å | |||||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 8 Å
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