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Updated: Jul 13, 2025

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In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
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PAICS 无处不在征集了 UBAP2,以触发纯酶组合的相分离
Ming-Chieh Chou1, Yi-Hsuan Wang1, Fei-Yun Chen2
1Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan; Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taipei 106, Taiwan.
Molecular cell
|October 17, 2023
概括
purinosomes 通过酶组合来增强 purin 合成. 由ASB11驱动的PAICS多基化触发了这一过程,这对于黑色素瘤细胞生长和瘤发生至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 分子瘤学分子瘤学
背景情况:
- purinosomes 是在细胞压力期间增强de novo purin合成 (DNPS) 的代谢子.
- purinosom 组装的机制及其病理作用尚未完全理解.
研究的目的:
- 为了阐明驱动纯酶体组合的分子机制.
- 为了研究纯素体形成在人类黑色素瘤中的作用.
主要方法:
- 通过Cul5/ASB11 ubiquitin ligase对PAICS进行K6-多布基因化研究.
- 通过H3K9me3 / HP1α介导的转录沉默分析了ASB11上调.
- 检查了UBAP2在招募聚基化PAICS和诱导相位分离中的作用.
- 在人类黑色素瘤细胞和异种移植模型中评估ASB11表达和纯素体形成.
主要成果:
- 通过Cul5/ASB11对PAICS进行K6-多比基化对于纯酶体组合至关重要.
- 通过表观遗传修饰,ASB11的上调调节驱动PAICS的多基化.
- UBAP2调解了PAICS的相分离,从而启动了纯酶体的形成.
- 升高的ASB11促进了黑色素瘤中的构成性纯酶体组合,支持瘤生长.
结论:
- 确定了一种用于压力诱导的纯酶体组装的新机制,涉及ASB11,PAICS和UBAP2.
- 证明构成性纯酶体的形成对黑色素瘤的扩散和瘤产生至关重要.
- 突出了ASB11和纯酶体作为人类恶性瘤中潜在的治疗点.
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