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-Structure paper
| タイトル | A split-site E3 ligase mechanism enables ZNFX1 to ubiquitinate and cluster single-stranded RNA into ubiquitin-coated nucleoprotein particles. |
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| ジャーナル・号・ページ | Cell, Vol. 188, Issue 21, Page 5995-6011.e17, Year 2025 |
| 掲載日 | 2025年10月16日 |
著者 | Daniel B Grabarczyk / Eric J Aird / Vanessa Reznikow / Paul C Kirchgatterer / Julian F Ehrmann / Robert Kurzbauer / Lillie E Bell / Max J Kellner / Ritika Aggarwal / Alexander Schleiffer / Victoria Faas / Luiza Deszcz / Anton Meinhart / Gijs A Versteeg / Josef M Penninger / Lukas S Stelzl / Moritz M Gaidt / Ingrid Tessmer / Jacob E Corn / Tim Clausen / ![]() |
| PubMed 要旨 | Eukaryotic cells use a multi-layered immune response to combat intracellular pathogens. The ubiquitin ligase ZNFX1 has emerged as a crucial yet little understood player that regulates the immune ...Eukaryotic cells use a multi-layered immune response to combat intracellular pathogens. The ubiquitin ligase ZNFX1 has emerged as a crucial yet little understood player that regulates the immune response while protecting against RNA viruses. Our study unveils the molecular mechanism of ZNFX1, mediated by the joint activity of a helicase serving as a nucleic acid sensor and a non-conventional E3 module featuring a split active site. We demonstrate that single-stranded RNA stimulates E3 activity by fostering dimerization of ZNFX1 subunits that translocate along nucleic acid tracks. Juxtaposed E3 domains complement each other, leading to the ubiquitination of ZNFX1 itself and engaged RNA molecules, while clustering nucleic acids into dense nucleoprotein particles. We show that the E3 ligase activity of ZNFX1 protects cells during an immune response and propose that ubiquitin-coated particles formed by ZNFX1 represent part of an ancient mechanism to regulate both foreign and host RNA in the cell. |
リンク | Cell / PubMed:40876457 |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 3.67 - 3.9 Å |
| 構造データ | EMDB-52968, PDB-9q9z: ![]() PDB-9eve: |
| 化合物 | ![]() ChemComp-ZN: |
| 由来 |
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キーワード | RNA BINDING PROTEIN / Helicase / E3 ligase / armadillo domain / interferon-stimulated gene |
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