乳业科学与技术2025，Vol.48Issue(5)：40-48,9.DOI:10.7506/rykxyjs1671-5187-20250313-018
黄原胶与二十二碳六烯酸协同修饰对β-乳球蛋白抗原性和结构特性的影响
Effect of Combined Modification with Xanthan Gum and Docosahexaenoic Acid on the Antigenicity and Structural Characteristics of β-Lactoglobulin
摘要
Abstract
β-Lactoglobulin(β-LG)can cause severe allergic reactions.In this study,the effects of combined modification of β-LG with xanthan gum(XG)and docosahexaenoic acid(DHA)on its antigenicity and structural characteristics were investigated.DHA-β-LG and DHA-β-LG-XG complexes were obtained through non-covalent binding.Their antigenicity and structural characterization were carried out using indirect competitive enzyme linked immunosorbent assay,particle size analysis,three-dimensional fluorescence spectroscopy,Fourier transform infrared(FTIR)spectroscopy,simultaneous fluorescence spectroscopy,ultraviolet-visible absorption spectroscopy and molecular docking.The results showed that the antigenicity of the ternary complex was significantly reduced compared with those of β-LG and the binary complex(P<0.05).The highest inhibition rate,(24.81±0.27)%,of immunoglobulin G(IgG)binding capacity was observed at 2.5 mg/mL XG concentration.The ternary complex was more stable than the binary complex.As the concentration of XG increased,the particle size of the ternary complex increased and then decreased.Under the coexistence of XG and DHA,the relative contents of β-sheet and β-turn increased,and the relative contents of α-helix and random coil decreased.Furthermore,the exposure levels of both fluorophores and peptide bonds in β-LG showed a linear positive correlation with XG concentration.XG was inserted into the only hydrophobic cavity of β-LG,and DHA bound to the hydrophobic pocket on the surface of β-LG.Both XG and DHA formed the ternary complex with β-LG through hydrogen bonding,electrostatic interactions,and hydrophobic interactions.These structural changes affect the antigen binding epitopes of β-LG,thereby reducing its antigenicity.关键词
β-乳球蛋白/二十二碳六烯酸/黄原胶/相互作用/抗原性/结构Key words
β-lactoglobulin/docosahexaenoic acid/xanthan gum/interaction/allergenicity/structure分类
轻工纺织引用本文复制引用
王婧,梁肖娜,许一舟,郑欣玥,王佳玲,朱志鹏,姬雅雅,孙雨菲,陈代昌,赵倩..黄原胶与二十二碳六烯酸协同修饰对β-乳球蛋白抗原性和结构特性的影响[J].乳业科学与技术,2025,48(5):40-48,9.基金项目
大学生创新训练计划项目(202410323065Y （）
202419003XJ （）
202319015XJ) （）
