+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 5nms | |||||||||||||||
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タイトル | Hsp21 dodecamer, structural model based on cryo-EM and homology modelling | |||||||||||||||
要素 | (25.3 kDa heat shock protein, chloroplastic) x 2 | |||||||||||||||
キーワード | CHAPERONE / stress response / heat shock protein / all-beta greek key | |||||||||||||||
機能・相同性 | 機能・相同性情報 chloroplast nucleoid / chloroplast organization / protein folding chaperone complex / response to light stimulus / response to heat / regulation of DNA-templated transcription 類似検索 - 分子機能 | |||||||||||||||
生物種 | Arabidopsis thaliana (シロイヌナズナ) | |||||||||||||||
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: 10 Å | |||||||||||||||
データ登録者 | Rutsdottir, G. / Harmark, J. / Koeck, P.J.B. / Hebert, H. / Soderberg, C.A.G. / Emanuelsson, C. | |||||||||||||||
資金援助 | スウェーデン, デンマーク, 4件
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引用 | ジャーナル: J Biol Chem / 年: 2017 タイトル: Structural model of dodecameric heat-shock protein Hsp21: Flexible N-terminal arms interact with client proteins while C-terminal tails maintain the dodecamer and chaperone activity. 著者: Gudrun Rutsdottir / Johan Härmark / Yoran Weide / Hans Hebert / Morten I Rasmussen / Sven Wernersson / Michal Respondek / Mikael Akke / Peter Højrup / Philip J B Koeck / Christopher A G ...著者: Gudrun Rutsdottir / Johan Härmark / Yoran Weide / Hans Hebert / Morten I Rasmussen / Sven Wernersson / Michal Respondek / Mikael Akke / Peter Højrup / Philip J B Koeck / Christopher A G Söderberg / Cecilia Emanuelsson / 要旨: Small heat-shock proteins (sHsps) prevent aggregation of thermosensitive client proteins in a first line of defense against cellular stress. The mechanisms by which they perform this function have ...Small heat-shock proteins (sHsps) prevent aggregation of thermosensitive client proteins in a first line of defense against cellular stress. The mechanisms by which they perform this function have been hard to define due to limited structural information; currently, there is only one high-resolution structure of a plant sHsp published, that of the cytosolic Hsp16.9. We took interest in Hsp21, a chloroplast-localized sHsp crucial for plant stress resistance, which has even longer N-terminal arms than Hsp16.9, with a functionally important and conserved methionine-rich motif. To provide a framework for investigating structure-function relationships of Hsp21 and understanding these sequence variations, we developed a structural model of Hsp21 based on homology modeling, cryo-EM, cross-linking mass spectrometry, NMR, and small-angle X-ray scattering. Our data suggest a dodecameric arrangement of two trimer-of-dimer discs stabilized by the C-terminal tails, possibly through tail-to-tail interactions between the discs, mediated through extended IVI motifs. Our model further suggests that six N-terminal arms are located on the outside of the dodecamer, accessible for interaction with client proteins, and distinct from previous undefined or inwardly facing arms. To test the importance of the IVI motif, we created the point mutant V181A, which, as expected, disrupts the Hsp21 dodecamer and decreases chaperone activity. Finally, our data emphasize that sHsp chaperone efficiency depends on oligomerization and that client interactions can occur both with and without oligomer dissociation. These results provide a generalizable workflow to explore sHsps, expand our understanding of sHsp structural motifs, and provide a testable Hsp21 structure model to inform future investigations. | |||||||||||||||
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 | 5nms.cif.gz | 495.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb5nms.ent.gz | 411.7 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 5nms.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 | 5nms_validation.pdf.gz | 846.6 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 5nms_full_validation.pdf.gz | 980.4 KB | 表示 | |
XML形式データ | 5nms_validation.xml.gz | 67.5 KB | 表示 | |
CIF形式データ | 5nms_validation.cif.gz | 91.8 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/nm/5nms ftp://data.pdbj.org/pub/pdb/validation_reports/nm/5nms | 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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-要素
#1: タンパク質 | 分子量: 16393.787 Da / 分子数: 6 / 由来タイプ: 組換発現 由来: (組換発現) Arabidopsis thaliana (シロイヌナズナ) 遺伝子: HSP25.3, At4g27670, T29A15.160 / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: P31170 #2: タンパク質 | 分子量: 11777.428 Da / 分子数: 6 / 由来タイプ: 組換発現 由来: (組換発現) Arabidopsis thaliana (シロイヌナズナ) 遺伝子: HSP25.3, At4g27670, T29A15.160 / 発現宿主: Escherichia coli (大腸菌) / 参照: UniProt: P31170 |
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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: Hsp21 dodecamer, a chloroplast small heat shock protein chaperone タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: Arabidopsis thaliana (シロイヌナズナ) |
由来(組換発現) | 生物種: Escherichia coli (大腸菌) |
緩衝液 | pH: 8 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
急速凍結 | 装置: FEI VITROBOT MARK I / 凍結剤: ETHANE |
-電子顕微鏡撮影
顕微鏡 | モデル: JEOL 2100F |
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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 |
撮影 | 電子線照射量: 1.4 e/Å2 フィルム・検出器のモデル: DIRECT ELECTRON DE-20 (5k x 3k) |
-解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING ONLY | ||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 33456 | ||||||||||||||||||||||||||||||||
対称性 | 点対称性: D3 (2回x3回 2面回転対称) | ||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 10 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 18407 / 対称性のタイプ: POINT |