设db1和Atf7IP形成一个异构三元复合体,阻止了设db1的核出口.
Leena Kariapper1, Ila A Marathe2, Ashley Brower Niesman3
1Department of Structural Biology, Van Andel Institute, Grand Rapids, MI, USA.
The Journal of biological chemistry
|May 8, 2025
概括
Setdb1和Atf7IP形成了一个稳定的复合体,揭示了Atf7IP如何阻止Setdb1从核中导出. 这种相互作用对于调节组织素甲基化和静止逆转移子至关重要.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 结构生物学 结构生物学
背景情况:
- 通过Setdb1进行的基因组H3K9甲基化 (H3K9me) 对于通过形成异质染色素来静止逆转移子 (rTE) 是必不可少的.
- Atf7IP是已知的Setdb1的结合伙伴,调解其核定位,激活和染色素招募.
- Setdb1/Atf7IP相互作用的结构基础在很大程度上是未知的.
研究的目的:
- 阐明Setdb1/Atf7IP相互作用的结构细节.
- 了解Atf7IP调节Setdb1核定位和活动的机制.
- 调查Atf7IP对象在Setdb1复合体形成和功能中的作用.
主要方法:
- 阿尔法Fold2结构预测.
- 在体外进行生物化学复制试验.
- 细胞测试以确认复杂的形成和定位.
主要成果:
- 在体外和细胞中,Setdb1和Atf7IP形成了一个稳定的异构三元复合体 (1:2固体测量).
- Atf7IP自关联到多元器件中,这些多元器件在Setdb1绑定时得到解析.
- Setdb1通过涉及Setdb1核出口信号 (NES) 的卷轴-卷轴相互作用与Atf7IP结合,而Atf7IP在NES结合方面与Crm1竞争,从而抑制Setdb1核出口.
- 此外,Setdb1与Atf7IP2形成异构三元复合物,并且可以形成Setdb1/Atf7IP/Atf7IP2的混合异构三元复合物.
- Atf7IP和Atf7IP2的差异表达表明,它们的异构分离剂可能微调Setdb1活性.
结论:
- 结构和生物化学表征揭示了Setdb1和Atf7IP的新型异构三元复合体.
- Atf7IP作为一个关键的监管机构,通过与Crm1.1的竞争直接抑制Setdb1核出口.
- 形成不同的Setdb1/Atf7IP/Atf7IP2异构体为微调逆转移子的表观遗传调节提供了一种机制.
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