核素识别MYC促进剂G-四重复的结构基础
Luying Chen1, Jonathan Dickerhoff1, Ke-Wei Zheng2
1Borch Department of Medicinal Chemistry and Molecular Pharmacology, College of .Pharmacy, Purdue University, West Lafayette, IN, USA.
概括
核蛋白与癌细胞中的MYC瘤基因促进体G-四重复 (MycG4) 结合. 这种对表观遗传调节至关重要的相互作用涉及多个结合域,并建议G-四重复作为药物发现的关键标.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- MYC瘤基因促进物G-四重复 (MycG4) 是不朽细胞中转录的关键调节者.
- 核是一种与MycG4结合的蛋白质,具有很高的亲和力,表现出对RNA的偏好.
研究的目的:
- 阐明核素与MycG4.4相互作用的结构基础.
- 在细胞环境中确认核素与MycG4的结合.
- 了解这种相互作用在表观遗传转录调节中的作用.
主要方法:
- 进行X射线晶体学以确定核-MycG4复合物的结构.
- 核磁共振 (NMR) 谱学用于研究与特定循环的相互作用.
- 在目标下进行切割和标记测序 (CUT&Tag),以验证细胞中的结合.
主要成果:
- 晶体结构显示出一个平行的三四度G-四重复,由核素的RNA结合域 (RBDs) 1和2和Linker12结合.
- 核素的RBD3和RBD4通过NMR被证明与MycG4的1-nt循环结合.
- CUT&Tag证实,核素在细胞内与MycG4结合.
结论:
- 核素通过基于G4构成的多价值相互作用来识别G-四复合体.
- G四复合体可能是核素的初级细胞基质.
- 这项研究提供了对G-quadruplex介导的表观遗传转录调节的见解,并有助于G4向药物发现.
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