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• W2539343859 abstract "As a natural dietary polyphenol, 3,4,5-tri-O-caffeoylquinic acid (3,4,5-triCQA) exhibits numerous stronger pharmacological activities than that of its analogues. Studies on interaction between 3,4,5-triCQA and protein are very helpful for understanding the mechanism of these enhanced biological functions. In this study, 1H saturation transfer difference NMR (1H STD-NMR) combined with multi-spectroscopy were used to probe the interaction of 3,4,5-triCQA with human serum albumin (HSA). Both qualitative and quantitative 1H STD-NMR indicated that 3,4,5-triCQA can specifically bind to HSA at the favored Sudlow's site II with caffeoyl groups as the main recognizable moiety. Fluorescence emission spectra showed that Stern-Volmer quenching constant (KSV) decreases from 10.132×104M-1 to 9.711×104M-1 with temperature raise, indicating that 3,4,5-triCQA quenches HSA fluorescence through a static mechanism. Binding constant (Kb=5.557×105M-1) and the number of binding sites (n≈1) at 298K suggested that 3,4,5-triCQA only occupies one site in HSA with high affinity. Enthalpy (ΔH=-28.802kJ/mol) and entropy (ΔS=12.429J/mol/K) change proved the dominant role of electrostatic interaction in binding process. Multi-spectroscopic analysis also confirmed that the protein secondary structure and hydrophobicity were significantly affected. Molecular docking further verified the NMR and spectroscopic results. Overall, 3,4,5-triCQA exhibited a strong albumin affinity owing to the plural caffeoyl groups, which lead to the enhanced pharmacological activities. This study clarified the molecular mechanism of 3,4,5-triCQA in binding to HSA, and the findings are beneficial for the research on polyphenol-like drugs and antioxidants in foods or cosmetics." @default.
• W2539343859 created "2016-10-28" @default.
• W2539343859 creator A5006951473 @default.
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• W2539343859 date "2016-12-01" @default.
• W2539343859 modified "2023-10-16" @default.
• W2539343859 title "Molecular mechanism of the binding of 3,4,5-tri-O-caffeoylquinic acid to human serum albumin: Saturation transfer difference NMR, multi-spectroscopy, and docking studies" @default.
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• W2539343859 doi "https://doi.org/10.1016/j.jphotobiol.2016.10.017" @default.
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• W2539343859 hasPublicationYear "2016" @default.
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