National Institutes of Health/National Institute on Aging (NIH/NIA)
R01073277
米国
David and Lucile Packard Foundation
2019-69660
米国
Howard Hughes Medical Institute (HHMI)
米国
引用
ジャーナル: Mol Cell / 年: 2025 タイトル: Structural basis for the midnolin-proteasome pathway and its role in suppressing myeloma. 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 / ...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 / 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.