+検索条件
-Structure paper
| タイトル | Structural visualization of HECT-type E3 ligase Ufd4 accepting and transferring ubiquitin to form K29/K48-branched polyubiquitination. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 4313, Year 2025 |
| 掲載日 | 2025年5月9日 |
著者 | Xiangwei Wu / Huasong Ai / Junxiong Mao / Hongyi Cai / Lu-Jun Liang / Zebin Tong / Zhiheng Deng / Qingyun Zheng / Lei Liu / Man Pan / ![]() |
| PubMed 要旨 | The K29/K48-linked ubiquitination generated by the cooperative catalysis of E3 ligase Ufd4 and Ubr1 is an enhanced protein degradation signal, in which Ufd4 is responsible for introducing K29-linked ...The K29/K48-linked ubiquitination generated by the cooperative catalysis of E3 ligase Ufd4 and Ubr1 is an enhanced protein degradation signal, in which Ufd4 is responsible for introducing K29-linked ubiquitination to K48-linked ubiquitin chains to augment polyubiquitination. How HECT-E3 ligase Ufd4 mediates the ubiquitination event remains unclear. Here, we biochemically determine that Ufd4 preferentially catalyses K29-linked ubiquitination on K48-linked ubiquitin chains to generate K29/K48-branched ubiquitin chains and capture structural snapshots of Ub transfer cascades for Ufd4-mediated ubiquitination. The N-terminal ARM region and HECT domain C-lobe of Ufd4 are identified and characterized as key structural elements that together recruit K48-linked diUb and orient Lys29 of its proximal Ub to the active cysteine of Ufd4 for K29-linked branched ubiquitination. These structures not only provide mechanistic insights into the architecture of the Ufd4 complex but also provide structural visualization of branched ubiquitin chain formation by a HECT-type E3 ligase. |
リンク | Nat Commun / PubMed:40341121 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.31 - 3.63 Å |
| 構造データ | EMDB-35929, PDB-8j1p: EMDB-35931, PDB-8j1r: EMDB-62292, PDB-9ken: |
| 由来 |
|
キーワード | LYASE / Ufd4 / HECT / E3 / K29/48 / LIGASE / Ubc4 / Ubc4-Ub / HECT-type E3 ligase / HECT E3 ligase / Branching |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク






homo sapiens (ヒト)
キーワード