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用尿素增强G-四重复结构的热稳定性

Nabeel Tariq¹, Christine Xu¹, Jingtong Wang¹

¹Graduate Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Canada.

Biophysical chemistry

|June 7, 2023

概括

尿素稳定G-四重复的DNA结构,与其对蛋白质的变性效应相反. 这项研究表明,尿素增强了G-四重复的热稳定性,特别是那些具有单基循环的循环.

科学领域:

生物化学生化学
分子生物学分子生物学
结构生物学结构生物学

背景情况:

尿素是蛋白质折叠研究中常见的变质剂.
尿素不如蛋白质有效地破坏双链核酸的稳定性.
以前的研究表明,尿素会破坏折叠的G-四重复的DNA结构的稳定.

研究的目的:

为了研究尿素对G-四倍体DNA结构的影响,特别是寡氧化核酸G3T和相关序列.
为了确定尿素是否可以稳定G-四重复结构,与其已知的变质特性相反.

主要方法:

在或离子的存在下研究了由寡氧化核酸 (ODN) G3T和相关序列形成的G-四重复.
研究的尿素度高达7M.
利用循环二重化 (CD) 光谱来确认G-四重复结构,并监测随着尿素增加的光谱变化.
使用紫外线吸收来测量热诱导的过渡温度 (Tm),以评估热稳定性.

主要成果:

尿素对G-四重复结构表现出稳定作用,观察到高达7M度.
带有单个胺或氨酸残留在环中的G四复合体在尿素的分子度中表现出增强的稳定性.
循环二重化谱证实了G-四重体的形成,并表明与增加尿素的结构变化.
增加的尿素度导致单基循环的G-四重复合体的Tm显著增加.

结论:

尿素可以稳定G-四重复的DNA结构,这一发现与其典型的变性作用形成鲜明对比.
在G-四重复的循环区域在尿素的存在下对它们的热稳定性起着至关重要的作用.
这些发现表明尿素和核酸结构之间存在复杂的相互作用,这取决于特定的结构特征,如循环组成.

关键词:

一个圆形的二重化.在G-quadruplex中使用.溶剂相互作用溶剂相互作用热力学是一种热力学.尿素氨基酸尿素氨基酸

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