解读细菌翅膀螺旋转转转录因子的蛋白质-DNA代码
Adam P Joyce1, James J Havranek2
1Program in Developmental, Regenerative, and Stem Cell Biology, Washington University in St. Louis, St. Louis, MO 63110, USA.
Quantitative biology (Beijing, China)
|November 22, 2023
概括
转录因子 (TFs) 结合DNA调节基因. 在特异性决定残留物 (SDR) 中的微小变化会改变TF:DNA结合,驱动功能分歧和识别多种DNA动机.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 生物信息学是一种生物信息学.
背景情况:
- 转录因子 (TFs) 通过特定序列的DNA结合来调节基因表达.
- 确定特异性的氨基酸残留物 (SDR) 的氨基酸变化显著影响TF:DNA相互作用和TF的功能分歧.
- 了解TF:DNA结合机制对于破译基因调节至关重要.
研究的目的:
- 研究E. coli*中OmpR亚家族翼螺旋转螺旋TFs的约束偏好.
- 阐明SDR在TF:DNA序列识别和进化差异中的作用.
- 识别控制特定序列TF:DNA相互作用的结构代码.
主要方法:
- 使用SELEX和Spec-seq.q.进行高通量特异性分析.
- 结构建模和TF:DNA相互作用的进化分析.
- OmpR同类的直接特异性分析和预测的SDR-swap变体.
主要成果:
- *大肠杆菌* OmpR对应物识别了含有GT-A或GCT的DNA重复,其间距可变.
- 序列偏好与GT-A图案中的氨基酸相似性相关,而GCT图案被具有低同质性的TF识别.
- 个别的SDR会影响局部和远程的DNA结合偏好.
结论:
- 一个共同的结构代码是特定序列的翅膀螺旋旋转螺旋TF:DNA相互作用的基础.
- 微小的残留物改变可以导致识别不同的DNA序列动机.
- 进一步的SDR分析将揭示TF进化分歧的更多机制.
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