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使用蛋白质电荷转移光谱监测原胺与DNA的结合

Anurag Priyadarshi¹, Simangka Bor Saikia¹, Rajaram Swaminathan¹

¹Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781 039, India.

The journal of physical chemistry. B

|October 1, 2024

概括

鱼精子原蛋白 (PRM) 呈现出独特的氨酸特异性电荷转移 (ProCharTS) 光谱和发光. 这种无标签的方法通过观察复合体形成时PRM吸收率的变化来有效监测DNA-蛋白结合.

科学领域:

生物物理化学生物物理化学
分子光谱学分子光谱学
生物化学生物化学

背景情况:

蛋白质具有固有的电子吸收和发光特性.
了解这些特性对于描述蛋白质结构和功能至关重要.
鱼精子原氨酸 (PRM) 是一种高度阴阳性蛋白质,参与DNA包装.

研究的目的:

为了研究鱼精子质氨酸 (PRM) 的内在电子吸收和发光.
为了描述PRM的氨酸特异性蛋白质电荷转移光谱 (ProCharTS).
为了证明PRM ProCharTS的应用,用于对DNA-蛋白相互作用的无标签监测.

主要方法:

光谱分析包括UV-Vis吸收和发光测量.
研究PRM度依赖的光谱变化.
使用光谱学和凝电泳,监测PRM-DNA复合体的形成.

主要成果:

PRM表现出新型的内在电子吸收和发光,归因于脊柱到侧链电荷转移 (PBS-CT) 和电荷重组.
观察到的ProCharTS具有独特的氨酸特异性,因为氨酸是PRM中唯一的充电残留物.
在与基因组DNA (gDNA) 结合时,PRM ProCharTS在260nm的吸收率下降了72%,表明复杂的形成和沉.

结论:

PRM具有独特的氨酸特异性光谱特性 (ProCharTS),具有非常规的发光.
聚合效应在测试度范围内不会影响PRM吸收或发光.
PRM ProCharTS提供了一种敏感的,无标签的方法,用于间接监测DNA与蛋白质的结合.

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