β-乳球蛋白与矢车菊素-3-O-葡萄糖苷相互作用研究
首发时间:2017-12-18
摘要:矢车菊素-3-O-葡萄糖苷(cyanidin-3-O-glucoside,C3G)作为一种自然界最为常见的花色苷,不仅被用作食品着色剂,也具有抗氧化,抗癌等生物活性。本研究利用荧光光谱、圆二色谱(CD)技术研究C3G与β-乳球蛋白(β-lactoglobulin,β-Lg)间的相互作用机制,通过动态光散射原理测定β-Lg-C3G非共价复合物的结构特性。实验结果表明,C3G与β-Lg主要通过疏水作用力与氢键作用力生成摩尔比近1:1的非共价复合物,且此时复合物粒径最小;同步荧光光谱,圆二色谱分析结果表明,C3G的添加显著影响蛋白质酪氨酸所处微环境的极性与疏水性,并改变β-Lg二级结构的组成,改变蛋白质构象,从而进一步验证了C3G与β-Lg相互作用的存在。
关键词: 蛋白质化学 β-乳球蛋白 矢车菊素-3-O-葡萄糖苷 相互作用
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Interaction between β-lactoglobulin and cyanidin-3-O-glucoside
Abstract:Cyanidin-3-O-glucoside (C3G) is one of the most common anthocyanins, it has several biological activities including anti-oxidation, anti-tumor activity, and it can also be used as a food colorant. In this study, the interaction between C3G and β-lactoglobulin (β-Lg) was analyzed by fluorescence spectroscopy and circular dichroism (CD), the particle size and zeta potential was determined by dynamic light scattering, which helps to look deep into the formation mechanism of the β-Lg-C3G complexes. The results showed that β-Lg bound C3G via hydrophobic interaction and hydrogen bonding to form the non-covalent complexes with a molar ratio of 1:1 to reach the smallest size. The synchronous fluorescence spectra, CD spectra showed that C3G significantly affected the polarity and hydrophobicity of microenvironments around tyrosine residues and the component of proteins secondary structure were changed upon C3G binding, which confirms the interaction of C3G with β-Lg.
Keywords: Protein chemistry β-lactoglobulin cyanidin-3-O-glucoside interaction
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