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-Structure paper
| タイトル | Structure of E6AP in complex with HPV16-E6 and p53 reveals a novel ordered domain important for E3 ligase activation. |
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| ジャーナル・号・ページ | Structure, Vol. 33, Issue 3, Page 504-516.e4, Year 2025 |
| 掲載日 | 2025年3月6日 |
著者 | Sebastian Kenny / Shalini Iyer / Clinton A Gabel / Natalia Tegenfeldt / Andrew G DeMarco / Mark C Hall / Leifu Chang / V Jo Davisson / Scott Vande Pol / Chittaranjan Das / ![]() |
| PubMed 要旨 | High-risk human papillomavirus E6 oncoprotein is a model system for the recognition and degradation of cellular p53 tumor suppressor protein. There remains a gap in the understanding of the ubiquitin ...High-risk human papillomavirus E6 oncoprotein is a model system for the recognition and degradation of cellular p53 tumor suppressor protein. There remains a gap in the understanding of the ubiquitin transfer reaction, including placement of the E6AP catalytic HECT domain of the ligase concerning the p53 substrate and how E6 itself is protected from ubiquitination. We determined the cryoelectron microscopy (cryo-EM) structure of the E6AP/E6/p53 complex, related the structure to in vivo modeling of the tri-molecular complex, and identified structural interactions associated with activation of the ubiquitin ligase function. The structure reveals that the N-terminal ordered domain (NOD) in E6AP has a terminal alpha helix that mediates the interaction of the NOD with the HECT domain of E6AP and protects the HPV-E6 protein from ubiquitination. In addition, this NOD helix is required for E6AP ligase function by contributing to the affinity of the E6-E6AP association, modulating E6 substrate recognition, while displacing UbcH7. |
リンク | Structure / PubMed:39818213 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.54 Å |
| 構造データ | EMDB-45601, PDB-9cht: |
| 由来 |
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キーワード | LIGASE / Complex / Viral / Ubiquitination |
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著者
リンク

homo sapiens (ヒト)
human papillomavirus 16 (パピローマウイルス)
streptococcus sp. group g (バクテリア)
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