通过含有核基氨基酸的蛋白质表现出的i-图案DNA基质的增强结合亲和力
Xiaoguang Bai1, Poulami Talukder1, Sasha M Daskalova1
1Biodesign Center for BioEnergetics, and School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287, United States.
Journal of the American Chemical Society
|March 7, 2017
概括
研究人员修改了一种蛋白质
科学领域:
- 生物化学
- 分子生物学
- 结构生物学
背景情况:
- 不同质核核核蛋白LL (hnRNP LL) 的RNA识别动机1 (RRM1) 对DNA结合至关重要.
- BCL2 i- 基因 DNA 是一种 G 丰富的二次结构,涉及各种细胞过程.
- 了解蛋白与DNA的相互作用对于解读基因调节和疾病机制至关重要.
研究的目的:
- 研究将核基氨基酸纳入RRM1域对其与BCL2i基因DNA的结合亲和力的影响.
- 探索工程核基氨基酸调节DNA-蛋白相互作用的潜力.
主要方法:
- 通过位点定向的突变生成,将核基氨基酸引入RRM1域的特定位置.
- 进行了结合性亲和性研究,以评估RRM1变异和BCL2i基因DNA之间的相互作用.
- 用分子建模来预测参与DNA相互作用的氨基酸残留物.
主要成果:
- 在RRM1的位置24引入细胞氨基基基增强了对i基因DNA的结合亲和力,这表明与G14发生了沃森-克里克相互作用.
- 某些核基相似物 (例如相似物1) 也增加了RRM1- DNA的结合亲和力.
- 在G14的i-motifDNA修改减少了RRM1-DNA相互作用和核基氨基酸1的稳定作用.
结论:
- 核基氨基酸可以战略性地纳入蛋白质域,以控制和增强DNA-蛋白质相互作用.
- 工程核基氨基酸为开发新型DNA结合剂提供了有前途的工具.
- 这项研究强调了特定的残留物相互作用的重要性,例如涉及G14的残留物,在调解RR1- i- 基因DNA结合时.
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