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基于18-mer DNA结构的构造精细化

Jakub Svoboda¹, Daniel Berdár¹, Petr Kolenko¹

¹Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Průmyslová 595, 252 50 Vestec, Czech Republic.

Acta crystallographica. Section D, Structural biology

|June 20, 2023

概括

这项研究报告了与细菌重复性外基因帕林德罗姆相关的DNA18-mers的新晶体结构. 一个使用二核酸符合性 (NtC) 类的新型精制协议稳定了A型双重体的结构精制.

科学领域:

结构生物学结构生物学
生物化学生化学
基因组学就是基因组学.

背景情况:

细菌重复的外源性平行体 (REP) 是具有潜在调节作用的DNA序列.
了解DNA构造的结构基础对于破译基因调节至关重要.
富含CG的DNA序列可以采用非正规结构.

研究的目的:

确定具有系统突变的CG丰富DNA18-mers的晶体结构.
为了研究这些DNA序列在溶液和晶体形式中的结构行为.
开发和验证一种用于低分辨率数据的新型结构改进协议.

主要方法:

通过X射线晶体学,获得了9个新的DNA18-mers.晶体结构.
中心二核酸 (XZ) 系统突变到所有16种可能的序列.
开发和应用一个二核酸适应器 (NtC) 类驱动的精炼协议.
采用了一种新的验证方法,比较电子密度和形状相似性.

主要成果:

十个DNA18-mers结晶为A型复合体.
基于NTC的精炼协议显著稳定了结构精炼,特别是在电子密度较低的区域.
开发的协议可以适应其他低分辨率的结构数据,包括冷电子显微镜 (cryo-EM) 地图.
一种新的验证方法成功地用于评估最终结构模型的质量.

结论:

这项研究为与细菌REP相关的CG丰富DNA的结构多样性提供了新的见解.
由 NtC 驱动的精制协议提供了一种可靠的方法,用于从低分辨率数据中改进结构确定.
这些发现有助于理解DNA结构-功能关系和结构生物学方法.

关键词:

基因结构 DNA结构 DNA结构基本配对的配对方式在dnatco.datmos.org上,我们可以查看数据.结构改进结构提炼结构验证结构验证

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