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-Structure paper
| タイトル | Structural basis of K11/K48-branched ubiquitin chain recognition by the human 26S proteasome. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 9094, Year 2025 |
| 掲載日 | 2025年10月15日 |
著者 | Piotr Draczkowski / Szu-Ni Chen / Ting Chen / Yong-Sheng Wang / Hsin-An Shih / Jessica Y C Huang / Ming-Chieh Tsai / Shu-Yu Lin / Steven Lin / Rosa Viner / Yuan-Chih Chang / Kuen-Phon Wu / Shang-Te Danny Hsu / ![]() |
| PubMed 要旨 | Beyond the canonical K48-linked homotypic polyubiquitination for proteasome-targeted proteolysis, K11/K48-branched ubiquitin (Ub) chains are involved in fast-tracking protein turnover during cell ...Beyond the canonical K48-linked homotypic polyubiquitination for proteasome-targeted proteolysis, K11/K48-branched ubiquitin (Ub) chains are involved in fast-tracking protein turnover during cell cycle progression and proteotoxic stress. Here, we report cryo-EM structures of human 26S proteasome in a complex with a K11/K48-branched Ub chain. The structures revealed a multivalent substrate recognition mechanism involving a hitherto unknown K11-linked Ub binding site at the groove formed by RPN2 and RPN10 in addition to the canonical K48-linkage binding site formed by RPN10 and RPT4/5 coiled-coil. Additionally, RPN2 recognizes an alternating K11-K48-linkage through a conserved motif similar to the K48-specific T1 binding site of RPN1. The insights gleaned from these structures explain the molecular mechanism underlying the recognition of the K11/K48-branched Ub as a priority signal in the ubiquitin-mediated proteasomal degradation. |
リンク | Nat Commun / PubMed:41093839 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.4 - 4.0 Å |
| 構造データ | EMDB-36598, PDB-8jri: EMDB-36605, PDB-8jrt: EMDB-36645, PDB-8jti: EMDB-36764, PDB-8k0g: ![]() EMDB-37269: Consensus cryo-EM structure of human 26S proteasomal RP subcomplex (Ea state) bound to K11/K48-branched ubiquitin (Ub) chain composed of three Ub. ![]() EMDB-37273: Local refinement cryo-EM map of human 26S RP (Ea state) bound to K11/K48-branched ubiquitin (Ub) chain composed of three Ub, focused on the Ub binding region. ![]() EMDB-37276: Local refinement cryo-EM map of human 26S RP (Ea state) bound to K11/K48-branched ubiquitin (Ub) chain composed of three Ub, focused on Rpn3/Rpn7 region. ![]() EMDB-37277: Local refinement cryo-EM map of human 26S RP (Ea state) bound to K11/K48-branched ubiquitin (Ub) chain composed of three Ub, focused on AAA+ ATPase subcomplex. ![]() EMDB-37317: Consensus cryo-EM map of human 26S RP (Eb state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub. ![]() EMDB-37319: Local refinement cryo-EM map of human 26S RP (Eb state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on the Ub binding region. ![]() EMDB-37327: Local refinement cryo-EM map of human 26S RP (Eb state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on Rpn3/Rpn7 region. ![]() EMDB-37328: Local refinement cryo-EM map of human 26S RP (Eb state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on AAA+ ATPase subcomplex. ![]() EMDB-37334: Consensus cryo-EM map of human 26S RP (Ed state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub. ![]() EMDB-37335: Local refinement cryo-EM map of human 26S RP (Ed state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on the Ub binding region. ![]() EMDB-37341: Local refinement cryo-EM map of human 26S RP (Ed state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on the RP lid. ![]() EMDB-37344: Local refinement cryo-EM map of human 26S RP (Ed state) bound to K11/K48-branched ubiquitin (Ub) chain composed of four Ub, focused on AAA+ ATPase subcomplex. |
| 化合物 | ![]() ChemComp-ATP: ![]() ChemComp-MG: ![]() ChemComp-ADP: |
| 由来 |
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キーワード | CYTOSOLIC PROTEIN / protein degradation / macromolecular complex / ubiquitin-proteasome system |
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homo sapiens (ヒト)
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