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基本情報
登録情報 | データベース: EMDB / ID: EMD-7097 | |||||||||
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タイトル | Doubly PafE-capped 20S core particle in Mycobacterium tuberculosis | |||||||||
![]() | Doubly PafE-capped 20S CP | |||||||||
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![]() | Protein degradation / HYDROLASE | |||||||||
機能・相同性 | ![]() symbiont-mediated perturbation of host defenses / proteasome accessory complex / positive regulation of proteasomal protein catabolic process / zymogen binding / proteasome binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasomal protein catabolic process ...symbiont-mediated perturbation of host defenses / proteasome accessory complex / positive regulation of proteasomal protein catabolic process / zymogen binding / proteasome binding / proteasome endopeptidase complex / proteasome core complex, beta-subunit complex / threonine-type endopeptidase activity / proteasome core complex, alpha-subunit complex / proteasomal protein catabolic process / regulation of proteasomal protein catabolic process / proteasome complex / proteolysis involved in protein catabolic process / peptidoglycan-based cell wall / protein homooligomerization / modification-dependent protein catabolic process / proteasome-mediated ubiquitin-dependent protein catabolic process / extracellular region / plasma membrane / cytoplasm 類似検索 - 分子機能 | |||||||||
生物種 | ![]() ![]() | |||||||||
手法 | 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | |||||||||
![]() | Li H / Hu K | |||||||||
![]() | ![]() タイトル: Proteasome substrate capture and gate opening by the accessory factor PafE from . 著者: Kuan Hu / Jordan B Jastrab / Susan Zhang / Amanda Kovach / Gongpu Zhao / K Heran Darwin / Huilin Li / ![]() 要旨: In all domains of life, proteasomes are gated, chambered proteases that require opening by activators to facilitate protein degradation. Twelve proteasome accessory factor E (PafE) monomers assemble ...In all domains of life, proteasomes are gated, chambered proteases that require opening by activators to facilitate protein degradation. Twelve proteasome accessory factor E (PafE) monomers assemble into a single dodecameric ring that promotes proteolysis required for the full virulence of the human bacterial pathogen Whereas the best characterized proteasome activators use ATP to deliver proteins into a proteasome, PafE does not require ATP. Here, to unravel the mechanism of PafE-mediated protein targeting and proteasome activation, we studied the interactions of PafE with native substrates, including a newly identified proteasome substrate, the ParA-like protein, Rv3213c, and with proteasome core particles. We characterized the function of a highly conserved feature in bacterial proteasome activator proteins: a glycine-glutamine-tyrosine-leucine (GQYL) motif at their C termini that is essential for stimulating proteolysis. Using cryo-electron microscopy (cryo-EM), we found that the GQYL motif of PafE interacts with specific residues in the α subunits of the proteasome core particle to trigger gate opening and degradation. Finally, we also found that PafE rings have 40-Å openings lined with hydrophobic residues that form a chamber for capturing substrates before they are degraded, suggesting PafE has a previously unrecognized chaperone activity. In summary, we have identified the interactions between PafE and the proteasome core particle that cause conformational changes leading to the opening of the proteasome gate and have uncovered a mechanism of PafE-mediated substrate degradation. Collectively, our results provide detailed insights into the mechanism of ATP-independent proteasome degradation in bacteria. | |||||||||
履歴 |
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構造の表示
ムービー |
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構造ビューア | EMマップ: ![]() ![]() ![]() |
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マップデータ | ![]() | 193.1 MB | ![]() | |
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ヘッダ (付随情報) | ![]() ![]() | 11.6 KB 11.6 KB | 表示 表示 | ![]() |
FSC (解像度算出) | ![]() | 13.8 KB | 表示 | ![]() |
画像 | ![]() | 99.2 KB | ||
Filedesc metadata | ![]() | 5.1 KB | ||
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-検証レポート
文書・要旨 | ![]() | 516.7 KB | 表示 | ![]() |
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文書・詳細版 | ![]() | 516.3 KB | 表示 | |
XML形式データ | ![]() | 13.8 KB | 表示 | |
CIF形式データ | ![]() | 18.6 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
EMDBのページ | ![]() ![]() |
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「今月の分子」の関連する項目 |
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マップ
ファイル | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Doubly PafE-capped 20S CP | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
投影像・断面図 | 画像のコントロール
画像は Spider により作成 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.09 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
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試料の構成要素
-全体 : Doubly PafE-capped 20S CP
全体 | 名称: Doubly PafE-capped 20S CP |
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要素 |
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-超分子 #1: Doubly PafE-capped 20S CP
超分子 | 名称: Doubly PafE-capped 20S CP / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all |
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由来(天然) | 生物種: ![]() ![]() |
-分子 #1: Proteasome subunit alpha
分子 | 名称: Proteasome subunit alpha / タイプ: protein_or_peptide / ID: 1 / コピー数: 14 / 光学異性体: LEVO / EC番号: proteasome endopeptidase complex |
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由来(天然) | 生物種: ![]() ![]() |
分子量 | 理論値: 26.911039 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MSFPYFISPE QAMRERSELA RKGIARAKSV VALAYAGGVL FVAENPSRSL QKISELYDRV GFAAAGKFNE FDNLRRGGIQ FADTRGYAY DRRDVTGRQL ANVYAQTLGT IFTEQAKPYE VELCVAEVAH YGETKRPELY RITYDGSIAD EPHFVVMGGT T EPIANALK ...文字列: MSFPYFISPE QAMRERSELA RKGIARAKSV VALAYAGGVL FVAENPSRSL QKISELYDRV GFAAAGKFNE FDNLRRGGIQ FADTRGYAY DRRDVTGRQL ANVYAQTLGT IFTEQAKPYE VELCVAEVAH YGETKRPELY RITYDGSIAD EPHFVVMGGT T EPIANALK ESYAENASLT DALRIAVAAL RAGSADTSGG DQPTLGVASL EVAVLDANRP RRAFRRITGS ALQALLVDQE SP QSDGESS G UniProtKB: Proteasome subunit alpha |
-分子 #2: Bacterial proteasome activator
分子 | 名称: Bacterial proteasome activator / タイプ: protein_or_peptide / ID: 2 / コピー数: 14 / 光学異性体: LEVO |
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由来(天然) | 生物種: ![]() ![]() |
分子量 | 理論値: 18.963232 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: MVIGLSTGSD DDDVEVIGGV DPRLIAVQEN DSDESSLTDL VEQPAKVMRI GTMIKQLLEE VRAAPLDEAS RNRLRDIHAT SIRELEDGL APELREELDR LTLPFNEDAV PSDAELRIAQ AQLVGWLEGL FHGIQTALFA QQMAARAQLQ QMRQGALPPG V GKSGQHGH GTGQYL UniProtKB: Bacterial proteasome activator |
-分子 #3: Proteasome subunit beta
分子 | 名称: Proteasome subunit beta / タイプ: protein_or_peptide / ID: 3 / コピー数: 14 / 光学異性体: LEVO / EC番号: proteasome endopeptidase complex |
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由来(天然) | 生物種: ![]() ![]() |
分子量 | 理論値: 25.274264 KDa |
組換発現 | 生物種: ![]() ![]() |
配列 | 文字列: TTIVALKYPG GVVMAGDRRS TQGNMISGRD VRKVYITDDY TATGIAGTAA VAVEFARLYA VELEHYEKLE GVPLTFAGKI NRLAIMVRG NLAAAMQGLL ALPLLAGYDI HASDPQSAGR IVSFDAAGGW NIEEEGYQAV GSGSLFAKSS MKKLYSQVTD G DSGLRVAV ...文字列: TTIVALKYPG GVVMAGDRRS TQGNMISGRD VRKVYITDDY TATGIAGTAA VAVEFARLYA VELEHYEKLE GVPLTFAGKI NRLAIMVRG NLAAAMQGLL ALPLLAGYDI HASDPQSAGR IVSFDAAGGW NIEEEGYQAV GSGSLFAKSS MKKLYSQVTD G DSGLRVAV EALYDAADDD SATGGPDLVR GIFPTAVIID ADGAVDVPES RIAELARAII ESRSGADTFG SDGGEKHHHH HH UniProtKB: Proteasome subunit beta |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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![]() | 単粒子再構成法 |
試料の集合状態 | particle |
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試料調製
緩衝液 | pH: 7.4 |
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凍結 | 凍結剤: ETHANE |
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電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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撮影 | フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 1.9 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: ![]() |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |