通过增加PolΘ蛋白的表达,HPV16 E6蛋白促进微同质介导的病毒融合
Guangli Zhu1,2, Shuhei Asada1, Jithma P Abeykoon3
1Division of Radiation and Genome Stability, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215.
概括
HPV16 E6 型蛋白通过稳定 DNA 聚合酶 teta (PolΘ) 来促进微同质介导的末端结合 (MMEJ) DNA 修复. 这一过程涉及E3结合酶UBE3A和RAD23A,促进病毒基因组集成和癌症的发展.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 癌症研究 癌症研究
背景情况:
- 高风险的人类乳头瘤病毒16 (HPV16) 集成到宿主DNA中对于与HPV相关的癌症至关重要.
- 微同质介导端结合 (MMEJ) 是病毒基因组集成的关键途径.
- 没有完全理解HPVcoproteins调节MMEJ的机制.
研究的目的:
- 调查HPV16 E6上蛋白如何影响MMEJ通路活性.
- 为了确定参与E6中介MMEJ监管的宿主因素.
- 阐明DNA聚合酶甲基 (PolΘ) 在HPV驱动的致癌过程中的作用.
主要方法:
- 评估MMEJ活动对HPV16 E6表达的反应.
- 量化了PolΘ,UBE3A/E6AP和RAD23A的蛋白质含量.
- 利用了无处不在和蛋白酶体降解试验.
- 研究了E6,UBE3A和RAD23A之间的相互作用.
- 研究了RAD23A耗尽对PolΘ稳定性和MMEJ的影响.
主要成果:
- 通过增加PolΘ蛋白水平,HPV16 E6通过上调MMEJ活动.
- E6诱导的PolΘ稳定性取决于UBE3A/E6AP,而不是p53降解.
- E6将UBE3A重定向,以促进RAD23A的无处不在和降解.
- 失去了RAD23A的E6效应,稳定了PolΘ并增强了MMEJ.
结论:
- HPV16 E6 劫持了 UBE3A 酶以降解 RAD23A,这是 PolΘ 的一个关键调节器.
- 这个E6-UBE3A-RAD23A-PolΘ轴稳定了PolΘ,增加了MMEJ并促进了病毒融合.
- 这项研究揭示了病毒操纵宿主DNA修复用于瘤发生的新机制.
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