+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 4a8d | ||||||
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タイトル | DegP dodecamer with bound OMP | ||||||
要素 |
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キーワード | HYDROLASE/TRANSPORT PROTEIN / HYDROLASE-TRANSPORT PROTEIN COMPLEX / CHAPERONE | ||||||
機能・相同性 | 機能・相同性情報 intermembrane phospholipid transfer / peptidase Do / porin activity / response to temperature stimulus / protein quality control for misfolded or incompletely synthesized proteins / pore complex / chaperone-mediated protein folding / serine-type peptidase activity / cell outer membrane / protein folding ...intermembrane phospholipid transfer / peptidase Do / porin activity / response to temperature stimulus / protein quality control for misfolded or incompletely synthesized proteins / pore complex / chaperone-mediated protein folding / serine-type peptidase activity / cell outer membrane / protein folding / peptidase activity / virus receptor activity / outer membrane-bounded periplasmic space / response to heat / monoatomic ion transmembrane transport / response to oxidative stress / periplasmic space / receptor-mediated virion attachment to host cell / serine-type endopeptidase activity / DNA damage response / proteolysis / identical protein binding / metal ion binding / plasma membrane 類似検索 - 分子機能 | ||||||
生物種 | ESCHERICHIA COLI (大腸菌) | ||||||
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: 28 Å | ||||||
Model type details | CA ATOMS ONLY, CHAIN A, B, C, D, E, F, G, H, I, J, K, L, M | ||||||
データ登録者 | Malet, H. / Krojer, T. / Sawa, J. / Schafer, E. / Saibil, H.R. / Ehrmann, M. / Clausen, T. | ||||||
引用 | ジャーナル: Nat Struct Mol Biol / 年: 2012 タイトル: Newly folded substrates inside the molecular cage of the HtrA chaperone DegQ. 著者: Hélène Malet / Flavia Canellas / Justyna Sawa / Jun Yan / Konstantinos Thalassinos / Michael Ehrmann / Tim Clausen / Helen R Saibil / 要旨: The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA ...The HtrA protein family combines chaperone and protease activities and is essential for protein quality control in many organisms. Whereas the mechanisms underlying the proteolytic function of HtrA proteins are well characterized, their chaperone activity remains poorly understood. Here we describe cryo-EM structures of Escherichia coli DegQ in its 12- and 24-mer states in complex with model substrates, providing a structural model of HtrA chaperone action. Up to six lysozyme substrates bind inside the DegQ 12-mer cage and are visualized in a close-to-native state. An asymmetric reconstruction reveals the binding of a well-ordered lysozyme to four DegQ protomers. DegQ PDZ domains are located adjacent to substrate density and their presence is required for chaperone activity. The substrate-interacting regions appear conserved in 12- and 24-mer cages, suggesting a common mechanism of chaperone function. #1: ジャーナル: Nature / 年: 2008 タイトル: Structural basis for the regulated protease and chaperone function of DegP. 著者: Tobias Krojer / Justyna Sawa / Eva Schäfer / Helen R Saibil / Michael Ehrmann / Tim Clausen / 要旨: All organisms have to monitor the folding state of cellular proteins precisely. The heat-shock protein DegP is a protein quality control factor in the bacterial envelope that is involved in ...All organisms have to monitor the folding state of cellular proteins precisely. The heat-shock protein DegP is a protein quality control factor in the bacterial envelope that is involved in eliminating misfolded proteins and in the biogenesis of outer-membrane proteins. Here we describe the molecular mechanisms underlying the regulated protease and chaperone function of DegP from Escherichia coli. We show that binding of misfolded proteins transforms hexameric DegP into large, catalytically active 12-meric and 24-meric multimers. A structural analysis of these particles revealed that DegP represents a protein packaging device whose central compartment is adaptable to the size and concentration of substrate. Moreover, the inner cavity serves antagonistic functions. Whereas the encapsulation of folded protomers of outer-membrane proteins is protective and might allow safe transit through the periplasm, misfolded proteins are eliminated in the molecular reaction chamber. Oligomer reassembly and concomitant activation on substrate binding may also be critical in regulating other HtrA proteases implicated in protein-folding diseases. | ||||||
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 | 4a8d.cif.gz | 165.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb4a8d.ent.gz | 107.8 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 4a8d.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 | 4a8d_validation.pdf.gz | 729.6 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 4a8d_full_validation.pdf.gz | 729.2 KB | 表示 | |
XML形式データ | 4a8d_validation.xml.gz | 53.7 KB | 表示 | |
CIF形式データ | 4a8d_validation.cif.gz | 84.2 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/a8/4a8d ftp://data.pdbj.org/pub/pdb/validation_reports/a8/4a8d | 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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-要素
#1: タンパク質 | 分子量: 46852.926 Da / 分子数: 12 / 断片: DEGP / 変異: YES / 由来タイプ: 組換発現 / 由来: (組換発現) ESCHERICHIA COLI (大腸菌) / 発現宿主: ESCHERICHIA COLI (大腸菌) / 株 (発現宿主): CLC198 / 参照: UniProt: P0C0V0, peptidase Do #2: タンパク質 | | 分子量: 38336.242 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ESCHERICHIA COLI (大腸菌) / 株: CLC198 / 参照: UniProt: P06996 構成要素の詳細 | ENGINEERED RESIDUE IN CHAIN A, SER 236 TO ALA ENGINEERED RESIDUE IN CHAIN B, SER 236 TO ALA ...ENGINEERED | |
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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: DEGP DODECAMER BOUND TO OMP / タイプ: COMPLEX |
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緩衝液 | 名称: 300MM NACL, 50MM HEPES- NAOH / pH: 8 / 詳細: 300MM NACL, 50MM HEPES- NAOH |
試料 | 濃度: 0.16 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: EMBEDDED IN VITREOUS ICE USING C-FLAT HOLEY CARBON GRIDS AND A VITROBOT AT 20C. |
-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 |
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): 68100 X / 倍率(補正後): 68100 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1500 nm / Cs: 2 mm |
試料ホルダ | 温度: 91 K / 傾斜角・最大: 0 ° / 傾斜角・最小: -0.5 ° |
撮影 | 電子線照射量: 15 e/Å2 / フィルム・検出器のモデル: GENERIC CCD |
放射波長 | 相対比: 1 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: PHASE FLIPPING | ||||||||||||
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: 28 Å / 粒子像の数: 6285 / ピクセルサイズ(公称値): 4.44 Å / ピクセルサイズ(実測値): 4.44 Å 詳細: SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-1505(DEPOSITION ID: 6111). 対称性のタイプ: POINT | ||||||||||||
原子モデル構築 | プロトコル: RIGID BODY FIT / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: METHOD--RIGID BODY FITTING REFINEMENT PROTOCOL--X-RAY | ||||||||||||
原子モデル構築 | PDB-ID: 3CS0 Accession code: 3CS0 / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化 | 最高解像度: 28 Å | ||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 28 Å
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