Interactions of different polyphenols with bovine serum albumin using fluorescence quenching and molecular docking |
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Authors: | Mihaela Skrt,Evgen Benedik,Črtomir Podlipnik,Nata&scaron a Poklar Ulrih |
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Affiliation: | 1. Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia;2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia;3. Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins (CipKeBiP), Jamova 39, Ljubljana, Slovenia |
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Abstract: | Polyphenols are responsible for the major organoleptic characteristics of plant-derived foods and beverages. Here, we investigated the binding of several polyphenols to bovine serum albumin (BSA) at pH 7.5 and 25 °C: catechins [(−)-epigallocatechin-3-gallate, (−)-epigallocatechin, (−)-epicatechin-3-gallate], flavones (kaempferol, kaempferol-3-glucoside, quercetin, naringenin) and hydroxycinnamic acids (rosmarinic acid, caffeic acid, p-coumaric acid). Fluorescence emission spectrometry and molecular docking were applied to compare experimentally determined binding parameters with molecular modelling. Among these polyphenols, (−)-epicatechin-3-gallate showed the highest Stern–Volmer modified quenching constant, followed by (−)-epigallocatechin-3-gallate. Similarly, (−)-epicatechin-3-gallate had the highest effect on the Circular Dichroic spectrum of BSA, while the changes induced by other polyphenols were negligible. Molecular docking predicted high binding energies for (−)-epicatechin-3-gallate and (−)-epigallocatechin-3-gallate for the binding site on BSA near Trp213. Our data reveal that the polyphenol structures significantly affect the binding process: the binding affinity generally decreases with glycosylation and reduced numbers of hydroxyl groups on the second aromatic ring. |
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Keywords: | BSA, bovine serum albumin epicatechin-G, (&minus )-epicatechin-3-gallate epigallocatechin, (&minus )-epigallocatechin epigallocatechin-G, (&minus )-epigallocatechin-3-gallate kaempferol-glu, kaempferol-3-glucoside |
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