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-Structure paper
| タイトル | Cryo-EM structures of UBA6 reveal mechanisms of E1-E2 specificity and dual FAT10/ubiquitin thioester transfer. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年2月28日 |
著者 | Digant Nayak / Lijia Jia / Priscila Dos Santos Bury / Eliza A Ruben / Ankita Shukla / Anindita Nayak / Caleb M Stratton / Pirouz Ebadi / Hee Cho / Anna A Tumanova / Joyce T Varughese / Lingmin Yuan / Fei Gao / Kristin E Cano / Christopher Davies / Patrick Sung / Michaela U Gack / Elizabeth V Wasmuth / Shaun K Olsen / ![]() |
| PubMed 要旨 | UBA1 and UBA6 define parallel ubiquitin (Ub) activation systems that perform non-overlapping roles in Ub and ubiquitin-like protein (Ubl) signaling. Whereas UBA1 supports the canonical Ub pathway, ...UBA1 and UBA6 define parallel ubiquitin (Ub) activation systems that perform non-overlapping roles in Ub and ubiquitin-like protein (Ubl) signaling. Whereas UBA1 supports the canonical Ub pathway, UBA6 also activates the Ubl FAT10, linking Ub signaling to immune-regulated proteostasis. In addition to selective Ub/Ubl activation, UBA1 and UBA6 engage distinct sets of E2s, yet how these enzymes achieve selective E2 engagement has remained unclear. Using chemical trapping and high-resolution cryo-EM, we determine four structures of UBA6-E2 complexes representing the thioester-transfer step with either FAT10 or Ub, revealing how this E1 distinguishes its cognate partners. UBA6 achieves E2 specificity through coordinated contributions of the UFD and SCCH domains, a dual-domain mechanism that contrasts with the UFD-dominated selectivity of UBA1. The structures further show that an existing inositol hexakisphosphate (InsP₆)-binding site, unique to UBA6, stabilizes an expanded SCCH cleft that pre-organizes the enzyme for selective engagement of UBA6-specific E2s. These findings define principles for E1-E2 recognition and identify InsP₆ as a cofactor shaping specificity within the Ub-like conjugation network. |
リンク | Nat Commun / PubMed:41764162 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.73 - 3.86 Å |
| 構造データ | EMDB-73059, PDB-9ykv: EMDB-73060, PDB-9ykw: EMDB-73079, PDB-9ylb: EMDB-73081, PDB-9ylf: |
| 化合物 | ![]() ChemComp-AMP: ![]() ChemComp-IHP: ![]() ChemComp-POP: |
| 由来 |
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キーワード | TRANSFERASE/Ligase / E1 E2 enzymes / TRANSFERASE / TRANSFERASE-Ligase complex |
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