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基于SNR的蛋白质用三基标记使得高精度,高灵敏度和远程距离测量成为可能

Yande Gao¹, Bin-Bin Pan², Yurui Leng¹

¹The Province and Ministry Co-Sponsored Collaborative Innovation Center for Medical Epigenetics, Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics, School of Pharmacy, Tianjin Medical University, Tianjin 300070, P. R. China.

Analytical chemistry

|April 23, 2025

概括

新的aryl-linked trityl旋转标签 (FPS1-2) 提供了更好的生物稳定性和精度,用于使用脉冲二极电子磁共振光谱 (PD-EPR) 测量蛋白质的距离. 这些标签可以在细胞环境中进行敏感的超长距离测量.

科学领域:

生物物理化学生物物理化学
结构生物学结构生物学
频谱学是一种光谱学.

背景情况:

脉冲双极电子重磁共振光谱 (PD-EPR) 带有位点定向旋转标记对于研究生物分子结构和动态至关重要.
目前的局限性包括旋转标签链接器的灵活性,降低灵敏度和低生物稳定性,阻碍了细胞系统的准确测量.

研究的目的:

开发用于PD-EPR距离测量的新型与酸结合的三旋转标签,以提高生物稳定性和精度.
为了证明这些新标签在各种条件下对蛋白质的敏感,远程距离测量的实用性.

主要方法:

合成含有胺和胺甲基硫的与烯结合的三旋转标签 (FPS1-2).
通过与氨酸残留物的核友芳香替代 (SNAr) 反应进行位点定向的旋转标记.
对结合物对水解和还原剂,包括细胞溶解物的稳定性进行评估.
对标记的免疫球蛋白G结合蛋白 (GB1) 和第二个线粒体衍生激活酶 (Smac) 的PD-EPR测量.

主要成果:

FPS1与氨酸形成稳定的C-S结合物,表现出高生物稳定性和对水解和还原剂的抗性.
标记为FPS1的蛋白质产生了高度敏感和长距离的距离测量,在Smac.中记录了≤6.01nm的测量.
与maleimide旋转标签相比,FPS1的短,刚硬的基链接器导致距离分布显著更窄.

结论:

与阿里尔结合的三甲基旋转标签 (FPS1-2) 代表了PD-EPR研究的重大进展.
这些标签克服了现有的旋转标签的局限性,使蛋白质的精确,灵敏和超长距离测量成为可能.
基于SNR的结合策略为各种生物应用提供了强大而稳定的自旋标记生物分子.

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