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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: 9g0o | |||||||||||||||
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タイトル | Xenopus borealis undecorated microtubule - 14 protofilament, 3-start helix | |||||||||||||||
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![]() | PROTEIN FIBRIL / Microtubule Tubulin Cytoskeleton Filament | |||||||||||||||
機能・相同性 | ![]() microtubule-based process / structural constituent of cytoskeleton / microtubule / hydrolase activity / GTPase activity / GTP 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: 3.3 Å | |||||||||||||||
![]() | Troman, L.A. / Moores, C.A. | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Mechanistic basis of temperature adaptation in microtubule dynamics across frog species. 著者: Luca Troman / Ella de Gaulejac / Abin Biswas / Jennifer Stiens / Benno Kuropka / Carolyn A Moores / Simone Reber / ![]() ![]() 要旨: Cellular processes are remarkably effective across diverse temperature ranges, even with highly conserved proteins. In the context of the microtubule cytoskeleton, which is critically involved in a ...Cellular processes are remarkably effective across diverse temperature ranges, even with highly conserved proteins. In the context of the microtubule cytoskeleton, which is critically involved in a wide range of cellular activities, this is particularly striking, as tubulin is one of the most conserved proteins while microtubule dynamic instability is highly temperature sensitive. Here, we leverage the diversity of natural tubulin variants from three closely related frog species that live at different temperatures. We determine the microtubule structure across all three species at between 3.0 and 3.6 Å resolution by cryo-electron microscopy and find small differences at the β-tubulin lateral interactions. Using in vitro reconstitution assays and quantitative biochemistry, we show that tubulin's free energy scales inversely with temperature. The observed weakening of lateral contacts and the low apparent activation energy for tubulin incorporation provide an explanation for the overall stability and higher growth rates of microtubules in cold-adapted frog species. This study thus broadens our conceptual framework for understanding microtubule dynamics and provides insights into how conserved cellular processes are tailored to different ecological niches. | |||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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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 | ![]() | 1.6 MB | 表示 | ![]() |
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PDB形式 | ![]() | 1.3 MB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 50941MC ![]() 9fvjC ![]() 9g0pC ![]() 9g0qC ![]() 9g0rC ![]() 9g0sC ![]() 9g0tC C: 同じ文献を引用 ( M: このデータのモデリングに利用したマップデータ |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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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
#1: タンパク質 | 分子量: 49878.770 Da / 分子数: 6 / 由来タイプ: 天然 / 由来: (天然) ![]() #2: タンパク質 | 分子量: 50117.250 Da / 分子数: 6 / 由来タイプ: 天然 / 由来: (天然) ![]() #3: 化合物 | ChemComp-GDP / #4: 化合物 | ChemComp-GTP / #5: 化合物 | ChemComp-MG / 研究の焦点であるリガンドがあるか | Y | Has protein modification | N | |
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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: FILAMENT / 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: Undecorated tubulin lattice following polymerisation with GTP (no stabilising ligands). タイプ: COMPLEX 詳細: The native tubulin was isolated from the Xenopus eggs using TOG-affinity chromatography. Microtubules were polymerised on the cryo-EM grid. Entity ID: #1-#2 / 由来: NATURAL | |||||||||||||||||||||||||
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由来(天然) | 生物種: ![]() | |||||||||||||||||||||||||
緩衝液 | pH: 6.8 / 詳細: BRB80 + 1 mM GTP | |||||||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.8 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | |||||||||||||||||||||||||
試料支持 | グリッドのタイプ: C-flat-2/2 | |||||||||||||||||||||||||
急速凍結 | 装置: LEICA EM GP / 凍結剤: ETHANE / 湿度: 95 % / 凍結前の試料温度: 298 K 詳細: The sample was incubated on the grid for 10 minutes within the Leica chamber to allow for tubulin polymerisation. |
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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 |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 81000 X / 最大 デフォーカス(公称値): 2100 nm / 最小 デフォーカス(公称値): 600 nm / C2レンズ絞り径: 70 µm |
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: 3.84 sec. / 電子線照射量: 47.4 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 7500 |
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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 | |||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 192000 | |||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 255980 詳細: These are pseudo-particles following the symmetry expansion of ~21,000 particles 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: Initially a tubulin dimer was docked into the density within ChimeraX. Amino acids were altered for this model using swapaa. Molecular dynamics force field-based model fitting was carried out ...詳細: Initially a tubulin dimer was docked into the density within ChimeraX. Amino acids were altered for this model using swapaa. Molecular dynamics force field-based model fitting was carried out by ISOLDE using unsharpened and deepEMhancer processed density. The model was refined through iterations of ISOLDE and Phenix real_space_refinement softwares. | |||||||||||||||||||||||||||||||||||
原子モデル構築 | 詳細: The 14-3 Xenopus tropicalis tubulin dimer model (this publication) Source name: Other / タイプ: other |