在全球范围内,SETDB1活动是由H3K14通过其Triple Tudor域的乙化指导的
Thyagarajan T Chandrasekaran1, Michel Choudalakis1, Alexander Bröhm1
1Institute of Biochemistry and Technical Biochemistry, University of Stuttgart, Allmandring 31, 70569 Stuttgart, Germany.
Nucleic acids research
|November 14, 2024
概括
基因组H3氨酸14乙化 (H3K14ac) 对于SETDB1 (SET域分叉基因组氨酸甲基转移酶1) 的招募和活动至关重要. 这种由SETDB1的Triple Tudor域 (3TD) 介导的相互作用,建立了H3K9三甲基化 (H3K9me3) 基因沉默.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- SETDB1 (SET域分叉的基因素甲基转移酶1) 催化H3K9三甲基化 (H3K9me3),对异色素蛋白的形成和重复元素的沉默至关重要.
- SETDB1具有独特的三重图多尔域 (3TD),可以识别H3K14乙化 (H3K14ac) 与H3K9甲基化 (H3K9me1/2/3) 相结合.
研究的目的:
- 研究3TD-H3尾相互作用在SETDB1的H3K9甲基化活性中的功能作用.
- 阐明H3K14ac如何影响SETDB1的招聘和H3K9me3的建立.
主要方法:
- 使用和与H3K14ac和类似物重组核体的生物化学甲基化试验.
- 产生一种SETDB1.1.的结合减少的3TD突变体.
- 细胞分析将SETDB1活动与H3K14ac水平相关联,并评估HBO1淘汰赛的影响.
- 在SETDB1淘汰赛后对DNA低甲基化区域的分析.
主要成果:
- H3K14乙化对于SETDB1通过3TD.通过H3K9me1/2/3-K14ac位点的招募至关重要.
- 在细胞中,SETDB1的结合和活性与H3K14ac具有全球相关性.
- 在SETDB1依赖站点,HBO1淘汰会显著降低H3K9me3水平.
- 3TD对于SETDB1在特定区域的H3K9me3活动至关重要,例如L1M重复元素.
结论:
- H3K14ac和H3K9me3不是对抗性的,但在表观遗传调节中合作.
- H3K14ac是SETDB1通过3TD绑定招募的必要条件,这有助于H3K9me3的建立.
- 这种机制对于沉默特定的基因组区域,如L1M元素,尤为重要.
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