在没有氨酸的单体蛋白质中,蛋白质电荷转移光谱
Shah Ekramul Alom1, Rajaram Swaminathan1
1Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India. rsw@iitg.ac.in.
Physical chemistry chemical physics : PCCP
|June 13, 2023
概括
蛋白质电荷转移光谱 (ProCharTS) 在缺乏氨酸的蛋白质中观察到,使用氨基酸如氨酸,氨酸和酸盐. 这种光谱探测器可以监测富含充电氨基酸的蛋白质结构.
科学领域:
- 生物物理学的生物物理.
- 频谱学是一种光谱学.
- 蛋白质化学 蛋白质化学
背景情况:
- 蛋白质中的非芳香基可以作为染色体,产生UV可见吸收和发光.
- 蛋白质电荷转移光谱 (ProCharTS) 是由蛋白质内的捐赠体和接受体组之间的光诱导电子转移引起的.
- 之前对ProCharTS的研究主要集中在含氨酸的蛋白质上,这使得在缺乏氨酸的系统中对ProCharTS的理解存在差距.
研究的目的:
- 调查ProCharTS在缺乏lysine的蛋白质和中的存在和特征.
- 为了确定除了 lysine 之外的带电氨基酸是否可以促进 ProCharTS.
- 评估ProCharTS作为一种光谱探测器用于无素蛋白的潜力.
主要方法:
- 使用时间依赖密度函数理论计算来检查带电氨基酸吸收特征.
- 对单个氨基酸 (氨酸,氨酸,氨酸),同型多 (多氨酸,多氨酸) 和一种无素蛋白 (Symfoil PV2) 进行了实验性吸收和发光测量.
主要成果:
- 氨酸,氨酸和酸,以及无氨酸的多和Symfoil PV2蛋白,展示了ProCharTS.
- 与较小的分子相比,Symfoil PV2在接近UV-Vis的范围内显示了最高的ProCharTS吸收性.
- 关键的光谱特征,包括重叠的吸收,波长依赖的发光,大的斯托克斯转移和多个生命周期组件,在所有研究的系统中都得到保留.
结论:
- ProCharTS并不仅限于含有氨酸的蛋白质,而且可以由其他带电氨基酸如氨酸,氨酸和酸盐生成.
- 保存的光谱特征表明ProCharTS是在带电残留的蛋白质中是一种普遍现象.
- ProCharTS作为一种有价值的内在光谱探测器,用于结构分析含有充电氨基酸丰富的蛋白质,不论其氨酸含量如何.
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