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-Structure paper
| タイトル | Structural basis for the midnolin-proteasome pathway and its role in suppressing myeloma. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 13, Page 2597-2609.e11, Year 2025 |
| 掲載日 | 2025年7月3日 |
著者 | Christopher Nardone / Jingjing Gao / Hyuk-Soo Seo / Julian Mintseris / Lucy Ort / Matthew C J Yip / Milen Negasi / Anna K Besschetnova / Nolan Kamitaki / Steven P Gygi / Sirano Dhe-Paganon / Nikhil C Munshi / Mariateresa Fulciniti / Michael E Greenberg / Sichen Shao / Stephen J Elledge / Xin Gu / ![]() |
| PubMed 要旨 | The midnolin-proteasome pathway degrades many nuclear proteins without ubiquitination, but how it operates mechanistically remains unclear. Here, we present structures of the midnolin-proteasome ...The midnolin-proteasome pathway degrades many nuclear proteins without ubiquitination, but how it operates mechanistically remains unclear. Here, we present structures of the midnolin-proteasome complex, revealing how established proteasomal components are repurposed to enable a unique form of proteolysis. While the proteasomal subunit PSMD2/Rpn1 binds to ubiquitinated or ubiquitin-like (Ubl) proteins, we discover that it also interacts with the midnolin nuclear localization sequence, elucidating how midnolin's activity is confined to the nucleus. Likewise, PSMD14/Rpn11, an enzyme that normally cleaves ubiquitin chains, surprisingly functions non-enzymatically as a receptor for the midnolin Ubl domain, positioning the substrate-binding Catch domain directly above the proteasomal entry site to guide substrates into the proteasome. Moreover, we demonstrate that midnolin downregulation is critical for the survival of myeloma cells by stabilizing the transcription factor substrate IRF4. Our findings uncover the mechanisms underlying the midnolin-proteasome pathway and midnolin downregulation as a driver of multiple myeloma. |
リンク | Mol Cell / PubMed:40532701 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.9 - 3.9 Å |
| 構造データ | EMDB-44910, PDB-9bui: EMDB-44927, PDB-9bv1: ![]() EMDB-44928: M2A Midnolin Proteasome (translocating, focused on PSMD2) EMDB-44929, PDB-9bv2: EMDB-44930, PDB-9bv3: |
| 化合物 | ![]() ChemComp-ATP: ![]() ChemComp-MG: ![]() ChemComp-ADP: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | NUCLEAR PROTEIN / proteasome |
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homo sapiens (ヒト)
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