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对Spi-BDNA结合的Ets域进行结构分析,该域识别了5'-AGAA-3'和5'-GGAA-3'序列
Yasuhiro Nonaka1, Katsuaki Hoshino2, Takanori Nakamura3
1International Institute of Rare Sugar Research and Education, Kagawa University, Takamatsu, Kagawa, 760-8521, Japan; Department of Pharmacology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
Biochemical and biophysical research communications
|February 1, 2025
概括
转录因子Spi-B和IFN调节因子-7 (IRF-7) 合作诱导I型干扰素 (IFN-I) 的产生. 对DNA的Spi-B结合会诱导扭曲,从而促进IRF-7协会以增强IFN-I信号传输.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 血细胞树突细胞是通过托尔类受体 (TLR7和TLR9) 检测病原体时I型干扰素 (IFN-I) 的关键生产者.
- 转录因子Spi-B与IFN调节因子-7 (IRF-7) 一起合作激活IFN-I生产至关重要的Ifna4促进体.
- 斯皮-B识别了DNA序列5'-AGAA-3',与标准的Ets域序列5'-GGAA-3'不同.
研究的目的:
- 阐明Spi-B和IRF-7对Ifna4促销者的合作交易激活的分子机制.
- 确定Spi-B特定DNA结合的结构基础及其在促进IRF-7相互作用中的作用.
主要方法:
- 对Spi-B Ets域的X射线结构确定,该域与目标DNA序列 (5'-AGAA-3'和 5'-GGAA-3') 复合在一起.
- 用Ifna4促进体DNA对Spi-B和IRF-7复合物的计算建模.
主要成果:
- X射线结构显示,Spi-B结合会在识别部位诱导DNA扭曲,在5'-AGAA-3'序列中观察到更明显的扭曲.
- 5'-AGAA-3' DNA 序列中的 Spi-B 诱导的扭曲,为 Spi-B 和 IRF-7 的关联创造了有利的构造.
结论:
- Spi-B独特的DNA结合偏好及其诱导DNA扭曲的能力对于Ifna4促进体的合作转录激活至关重要.
- 这种结构机制促进了Spi-B-IRF-7复合体的组装,从而在响应TLR7/9刺激时产生强大的I型干扰素.
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