通过Hms1pDBD的促进子DNA签名序列的分子识别
Muhammad Hidayatullah Khan1, Chenchen Wang2, Nazish Rahman3
1MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China; Department of Systems Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, China.
International journal of biological macromolecules
|January 5, 2025
概括
研究人员阐明了Hms1p的DNA结合机制,Hms1p是酵母中的转录调节剂. 确定了关键的残留物,揭示了Hms1p如何特别与MEP2促进器DNA结合,为真菌基因调节提供了洞察力.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 菌类学 菌类学是指菌类学.
背景情况:
- 在真菌中的转录调节涉及像SREBPs这样的蛋白质.
- 在S. cerevisiae中的Hms1p调节了压力下的丝状生长.
- 从结构上来说,Hms1p与DNA的相互作用还不太清楚.
研究的目的:
- 为了确定Hms1pDNA结合域 (DBD) 复合物的晶体结构.
- 为了确定涉及Hms1p-DNA相互作用的特定残留物.
- 了解Hms1p对MEP2促销者的绑定机制.
主要方法:
- 进行X射线晶体学以解决Hms1pDBD-DNA复杂结构.
- 生物化学测试以验证残留物-DNA相互作用.
- 对Hms1p与其他bHLH转录调节者的比较分析.
主要成果:
- 在2.77 Å分辨率下确定了Hms1pDBD-DNA复合物的晶体结构.
- 特定的残留物 (Hms1pHis3/Asn4/Glu7/Tyr10/Arg11) 被确定为识别DNA签名序列的关键.
- 生物化学分析证实了这些残留物在DNA结合中的作用.
- 在bHLH蛋白中保存的残留物 (His,Glu,Arg) 促进了特定的DNA结合.
结论:
- Hms1p使用特定的残留物来结合MEP2促进体DNA签名序列.
- 在bHLH蛋白中保存的残留物在DNA识别中起着至关重要的作用.
- 这项研究提供了对Hms1p-DNA相互作用和真菌转录调节的结构性见解.
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