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Article

Indomethacin Increases Quercetin Affinity for Human Serum Albumin: A Combined Experimental and Computational Study and Its Broader Implications

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Department of Medicinal Chemistry, University of Zagreb Faculty of Pharmacy and Biochemistry, 10000 Zagreb, Croatia
2
Laboratory of Computational Modelling of Drugs, South Ural State University, 454008 Chelyabinsk, Russia
3
Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(16), 5740; https://doi.org/10.3390/ijms21165740
Received: 22 July 2020 / Revised: 6 August 2020 / Accepted: 8 August 2020 / Published: 10 August 2020
(This article belongs to the Section Physical Chemistry and Chemical Physics)
Human serum albumin (HSA) is the most abundant carrier protein in the human body. Competition for the same binding site between different ligands can lead to an increased active concentration or a faster elimination of one or both ligands. Indomethacin and quercetin both bind to the binding site located in the IIA subdomain. To determine the nature of the HSA-indomethacin-quercetin interactions, spectrofluorometric, docking, molecular dynamics studies, and quantum chemical calculations were performed. The results show that the indomethacin and quercetin binding sites do not overlap. Moreover, the presence of quercetin does not influence the binding constant and position of indomethacin in the pocket. However, binding of quercetin is much more favorable in the presence of indomethacin, with its position and interactions with HSA significantly changed. These results provide a new insight into drug-drug interactions, which can be important in situations when displacement from HSA or other proteins is undesirable or even desirable. This principle could also be used to deliberately prolong or shorten the xenobiotics’ half-life in the body, depending on the desired outcomes. View Full-Text
Keywords: human serum albumin; quercetin; indomethacin; pharmacokinetic interactions; fluorescence spectroscopy; docking; molecular dynamics; quantum chemistry human serum albumin; quercetin; indomethacin; pharmacokinetic interactions; fluorescence spectroscopy; docking; molecular dynamics; quantum chemistry
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MDPI and ACS Style

Rimac, H.; Tandarić, T.; Vianello, R.; Bojić, M. Indomethacin Increases Quercetin Affinity for Human Serum Albumin: A Combined Experimental and Computational Study and Its Broader Implications. Int. J. Mol. Sci. 2020, 21, 5740. https://doi.org/10.3390/ijms21165740

AMA Style

Rimac H, Tandarić T, Vianello R, Bojić M. Indomethacin Increases Quercetin Affinity for Human Serum Albumin: A Combined Experimental and Computational Study and Its Broader Implications. International Journal of Molecular Sciences. 2020; 21(16):5740. https://doi.org/10.3390/ijms21165740

Chicago/Turabian Style

Rimac, Hrvoje, Tana Tandarić, Robert Vianello, and Mirza Bojić. 2020. "Indomethacin Increases Quercetin Affinity for Human Serum Albumin: A Combined Experimental and Computational Study and Its Broader Implications" International Journal of Molecular Sciences 21, no. 16: 5740. https://doi.org/10.3390/ijms21165740

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