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    Interaction between bovine serum albumin and chitooligosaccharides: I. Molecular mechanism

    Year: 2021

    Journal: Food Chem., Volume 358, OCT 1

    Authors: Zhang, Hui; Zhang, Yanzhen; Huang, Yongqi; Wu, Ling; Guo, Qianwan; Wang, Qi; Liang, Li; Nishinari, Katsuyoshi; Zhao, Meng

    Organizations: National Natural Science Foundation of China [31972203, 31601514]; International Cooperation Project of Hubei Provincial Department of Science and Technology [DWHZ2017000010]; Hubei University of Technology National 111 Center for Cellular Regulation and Molecular Pharmaceutics [XBTK-2018001, XBTK-2020010]

    Keywords: Bovine serum albumin (BSA); Chitooligosaccharide (COS); Interaction; Molecular docking; Isothermal titration calorimetry; Quartz crystal microbalance dissipation

    The interaction between chitooligosaccharides (COS2-6) and bovine serum albumin (BSA) is worthy of investigation, which provides support for improving the physical properties (gelling, foaming, and emulsifying) of food proteins via COS addition and in vivo research on COS bioactivity. Component analysis indicated that COS2 and COS3 were enriched in the COS2-6-BSA precipitate. The fluorescence binding constant (1.73 x 10(3) M-1), Delta G of isothermal titration calorimetry (-6.7 kJ/mol), and the predicted Delta G of molecular docking (-10 to -5 kJ/mol) confirmed the weak interaction of COS2-6-BSA. Quartz crystal microbalance dissipation and molecular docking indicated that electrostatic and hydrophobic interactions were the main stabilization forces. Molecular docking showed that the predicted Delta G of COS2-6 to BSA decreased with the increasing degree of polymerization. This work clarified the weak and selective interaction between COS2-6 and BSA via various methods, which is useful for the food application of COS.
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