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-Structure paper
| タイトル | SINE compounds activate exportin-1 degradation via an allosteric mechanism. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2025 |
| 掲載日 | 2025年6月9日 |
著者 | Casey Elizabeth Wing / Ho Yee Joyce Fung / Bert Kwanten / Tolga Cagatay / Ashley B Niesman / Maarten Jacquemyn / Mehdi Gharghabi / Brecht Permentier / Binita Shakya / Rhituparna Nandi / Joseph M Ready / Trinayan Kashyap / Sharon Shacham / Yosef Landesman / Rosa Lapalombella / Dirk Daelemans / Yuh Min Chook |
| PubMed 要旨 | The nuclear export receptor exportin 1 (XPO1/CRM1) is often overexpressed in cancer cells, leading to the mislocalization of numerous cancer-related protein cargoes . Selinexor, a covalent XPO1 ...The nuclear export receptor exportin 1 (XPO1/CRM1) is often overexpressed in cancer cells, leading to the mislocalization of numerous cancer-related protein cargoes . Selinexor, a covalent XPO1 inhibitor, and other Selective Inhibitor of Nuclear Export (SINEs) restore proper nuclear localization by blocking XPO1-cargo binding . SINEs also induce XPO1 degradation via the Cullin-RING E3 ubiquitin ligase (CRL) substrate receptor ASB8 . Here we elucidate the mechanism underlying the high-affinity engagement of CRL5 with SINE-conjugated XPO1. Cryogenic electron microscopy (cryoEM) structures reveal that ASB8 binds to a cryptic site on XPO1, which becomes accessible only upon SINE conjugation. While molecular glue degraders typically interact with both CRL and the substrate , SINEs bind to XPO1 without requiring interaction with ASB8 for efficient XPO1 degradation. Instead, an allosteric mechanism facilitates high affinity XPO1-ASB8 interaction, leading to XPO1 ubiquitination and degradation. ASB8-mediated degradation is also observed upon treatment of the endogenous itaconate derivate 4-octyl itaconate, which suggests a native mechanism that is inadvertently exploited by synthesized XPO1 inhibitors. This allosteric XPO1 degradation mechanism of SINE compounds expands the known modes of targeted protein degradation beyond the well-characterized molecular glue degraders and proteolysis targeting chimeras of CRL4. |
リンク | bioRxiv / PubMed:39416201 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.37 - 4.21 Å |
| 構造データ | EMDB-70458, PDB-9og9: EMDB-70459, PDB-9oga: EMDB-70460, PDB-9ogb: EMDB-70461, PDB-9ogc: EMDB-70462, PDB-9ogd: EMDB-70463, PDB-9oge: EMDB-70464, PDB-9ogf: ![]() PDB-9ogn: ![]() PDB-9ogo: |
| 化合物 | ![]() ChemComp-V6A: ![]() ChemComp-GTP: ![]() ChemComp-MG: ![]() ChemComp-K85: ![]() PDB-1cbc: ![]() PDB-1cbb: ![]() ChemComp-GNP: ![]() ChemComp-GOL: ![]() ChemComp-CL: ![]() PDB-1cbd: ![]() ChemComp-HOH: |
| 由来 |
|
キーワード | PROTEIN TRANSPORT / nuclear export / HEAT repeat / inhibitor / protein degradation / TRANSPORT PROTEIN / Exportin / SINE / Export / XPO1 |
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