Park Paul S-H, Sapra K Tanuj, Koliński Michał, Filipek Sławomir, Palczewski Krzysztof, Muller Daniel J
Department of Pharmacology, Case Western Reserve University, Cleveland, Ohio 44106, USA.
J Biol Chem. 2007 Apr 13;282(15):11377-85. doi: 10.1074/jbc.M610341200. Epub 2007 Feb 15.
Single-molecule force spectroscopy (SMFS) is a powerful tool to dissect molecular interactions that govern the stability and function of proteins. We applied SMFS to understand the effect of Zn2+ on the molecular interactions underlying the structure of rhodopsin. Force-distance curves obtained from SMFS assays revealed the strength and location of molecular interactions that stabilize structural segments within this receptor. The inclusion of ZnCl2 in SMFS assay buffer increased the stability of most structural segments. This effect was not mimicked by CaCl2, CdCl2, or CoCl2. Thus, Zn2+ stabilizes the structure of rhodopsin in a specific manner.
单分子力谱(SMFS)是一种剖析决定蛋白质稳定性和功能的分子相互作用的强大工具。我们应用单分子力谱来了解锌离子(Zn2+)对视紫红质结构基础分子相互作用的影响。从单分子力谱分析中获得的力-距离曲线揭示了稳定该受体结构片段的分子相互作用的强度和位置。在单分子力谱分析缓冲液中加入氯化锌(ZnCl2)可增加大多数结构片段的稳定性。氯化钙(CaCl2)、氯化镉(CdCl2)或氯化钴(CoCl2)无法模拟这种效应。因此,锌离子以特定方式稳定视紫红质的结构。