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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Difference in Binding of Long- and Medium-Chain Fatty Acids with Serum Albumin: The Role of Macromolecular Crowding Effect
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Difference in Binding of Long- and Medium-Chain Fatty Acids with Serum Albumin: The Role of Macromolecular Crowding Effect

机译:长链和中链脂肪酸与血清白蛋白结合的差异:大分子挤出效应的作用

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摘要

Fatty acids (FAs) are transported by serum albumin in plasma. Studies have been undertaken to address the binding of MCFAs or LCFAs to human plasma albumin (HPA) and bovine serum albumin (BSA) by characterizing the binding affinities. Previous research on FA binding to serum albumin was usually performed in dilute solutions that are not sufficiently concentrated for the interpretation of the significance of the results under normal physiological conditions. How macromolecular crowded media affect fatty acids and bovine serum albumin (BSA) binding remains unknown. In this article, we investigated the mechanism of FA-BSA binding in a polyethylene glycol crowding environment by using thermodynamic and spectroscopic methods. Molecular crowding increased the binding constant for saturated medium-chain fatty acids (MCFAs) but significantly decreased the binding constant for unsaturated long-chain FAs. The binding sites tended to increase in all the cases. Further investigation revealed that crowding media might loosen the structure of BSA, facilitating MCFA-BSA binding. This research is useful for understanding the transportation of FAs by BSA under physiological conditions and may also help to control digestion by the eventual incorporation of macromolecular crowding agents into food formulations.
机译:脂肪酸(FAS)通过血清白蛋白在血浆中运输。已经通过表征结合亲和力来进行研究以解决MCFAS或LCFA与人血浆白蛋白(HPA)和牛血清白蛋白(BSA)的结合。以前关于对血清白蛋白的Fa结合的研究通常在稀释溶液中进行,所述稀释溶液不充分浓缩,以解释在正常生理条件下结果的重要性。大分子拥挤的介质如何影响脂肪酸,牛血清白蛋白(BSA)结合仍然未知。在本文中,我们通过使用热力学和光谱法研究了聚乙二醇挤压环境中FA-BSA结合的机制。分子挤出增加饱和介质 - 链脂肪酸的结合常数(MCFA),但显着降低了不饱和长链Fas的结合常数。结合位点倾向于在所有情况下增加。进一步调查显示,拥挤媒体可能松开BSA的结构,促进MCFA-BSA结合。该研究可用于了解生理条件下BSA的FAS运输,也可有助于通过最终掺入大分子挤入食品制剂的消化来控制消化。

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