Investigation of Interaction between Riboflavin and Riboflavin Binding Protein by Fluorescence Spectroscopy
WU Xiao-fen, CAI Zhao-xia, SUN Shu-guo, HUANG Qun, REN Guo-dong, HE Lan, MA Mei-hu*
National Research and Development Center for Egg Processing, College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
Abstract：The interaction between riboflavin and egg white riboflavin binding protein (RBP) was investigated using fluorescence spectroscopy. The binding mode, binding constants, thermodynamic parameters between riboflavin and RBP and energy transfer were studied. The experimental results showed that riboflavin has the ability to quench the intrinsic fluorescence of RBP because of a complex formed, and the quenching mechanism is static quenching. The binding constants were 5.35×108, 1.54×108, 0.56×108 L·mol-1 at 298, 308 and 318 K, respectively. The thermodynamic parameters were calculated, which suggested hydrogen bonds and Van der Waals played a major role in the interaction. The distance and efficiency of energy transfer between riboflavin and RBP were 0.70 nm and 0.39, respectively, based on the theory of Frster nonradiative energy transfer. Furthermore, the synchronous fluorescence spectroscopy was utilized to investigate the conformational transformation.
武小芬，蔡朝霞，孙术国，黄 群，任国栋，何 兰，马美湖* . 荧光光谱法研究核黄素与核黄素结合蛋白的相互作用[J]. 光谱学与光谱分析, 2012, 32(03): 719-722.
WU Xiao-fen, CAI Zhao-xia, SUN Shu-guo, HUANG Qun, REN Guo-dong, HE Lan, MA Mei-hu* . Investigation of Interaction between Riboflavin and Riboflavin Binding Protein by Fluorescence Spectroscopy . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(03): 719-722.
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