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-Structure paper
| タイトル | NUB1 traps unfolded FAT10 for ubiquitin-independent degradation by the 26S proteasome. |
|---|---|
| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 9, Page 1752-1765, Year 2025 |
| 掲載日 | 2025年4月11日 |
著者 | Connor Arkinson / Ken C Dong / Christine L Gee / Shawn M Costello / Aimee Chi Soe / Greg L Hura / Susan Marqusee / Andreas Martin / ![]() |
| PubMed 要旨 | The ubiquitin-like modifier FAT10 targets hundreds of proteins in the mammalian immune system to the 26S proteasome for degradation. This degradation pathway requires the cofactor NUB1, yet the ...The ubiquitin-like modifier FAT10 targets hundreds of proteins in the mammalian immune system to the 26S proteasome for degradation. This degradation pathway requires the cofactor NUB1, yet the underlying mechanisms remain unknown. Here, we reconstituted a minimal in vitro system with human components and revealed that NUB1 uses the intrinsic instability of FAT10 to trap its N-terminal ubiquitin-like domain in an unfolded state and deliver it to the 26S proteasome for engagement, allowing the degradation of FAT10-ylated substrates in a ubiquitin-independent and p97-independent manner. Using hydrogen-deuterium exchange, structural modeling and site-directed mutagenesis, we identified the formation of an intricate complex with FAT10 that activates NUB1 for docking to the 26S proteasome, and our cryo-EM studies visualized the highly dynamic NUB1 complex bound to the proteasomal Rpn1 subunit during FAT10 delivery and the early stages of ATP-dependent degradation. These findings identified a previously unknown mode of cofactor-mediated, ubiquitin-independent substrate delivery to the 26S proteasome that relies on trapping partially unfolded states for engagement by the proteasomal ATPase motor. |
リンク | Nat Struct Mol Biol / PubMed:40217121 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.7 - 3.1 Å |
| 構造データ | EMDB-42506, PDB-8usb: EMDB-42507, PDB-8usc: EMDB-42508, PDB-8usd: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-MG: ![]() ChemComp-ATP: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | HYDROLASE/PROTEIN BINDING / 26S protease complex / Nub1 / FAT10 / MOTOR PROTEIN / HYDROLASE-PROTEIN BINDING complex / 26S Proteasome |
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