通过转录因子NFIL3识别特定DNA序列的结构基础
Sizhuo Chen1, Ming Lei1, Ke Liu1
1Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China.
The Journal of biological chemistry
|February 21, 2024
概括
一种转录因子NFIL3将DNA与TTACGTAA基因结合起来. 在NFIL3突变破坏DNA结合,揭示其在疾病发病和免疫细胞调节中的作用.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 结构生物学 结构生物学
背景情况:
- CCAAT/增强剂结合蛋白 (C/EBPs) 是调节细胞过程的关键转录因子.
- 作为C/EBP家族的一员,NFIL3影响免疫细胞分化,昼夜节律和神经再生.
- NFIL3的精确DNA结合机制在很大程度上仍然没有被描述.
研究的目的:
- 阐明NFIL3转录因子的DNA识别机制.
- 为了研究NFIL3DNA结合的结构基础.
- 为了确定与疾病相关的突变对NFIL3DNA结合的影响.
主要方法:
- 异热定位热量计 (ITC) 用于结合亲和度测量.
- 进行X射线晶体学以确定与DNA结合的NFIL3 bZIP域的结构.
- 对与疾病相关的NFIL3突变的分析.
主要成果:
- NFIL3 特别结合于 TTACGTAA DNA 基因.
- 结构分析显示NFIL3通过其氨酸拉链进行二元化,并通过其基本区域绑定DNA,扩展的基本区域适合DNA主要槽.
- NFIL3与C/EBPα/β共享对TTACGTAA的DNA结合偏好.
- 在NFIL3 bZIP域中与疾病相关的突变损害了其DNA结合能力.
结论:
- NFIL3通过涉及其bZIP域的特定结构机制识别和结合TTACGTAADNA基因.
- 在NFIL3和其他C/EBP之间共享的DNA基因特征偏好表明保留了调节作用.
- 突变破坏NFIL3的DNA结合,凸显了它在疾病发病过程中的关键作用.
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