Abstract
This study was designed to examine the interactions of ergosterol with bovine serum albumin (BSA) and human serum albumin (HSA) under physiological conditions with the drug concentrations in the range of 2.99–105.88 μM and the concentration of proteins was fixed at 5.0 μM. The analysis of emission spectra quenching at different temperatures revealed that the quenching mechanism of HSA/BSA by ergosterol was the static quenching. The number of binding sites n and the binding constants K were obtained at various temperatures. The distance r between ergosterol and HSA/BSA was evaluated according to Föster non-radioactive energy transfer theory. The results of synchronous fluorescence, 3D fluorescence, FT-IR, CD and UV–Vis absorption spectra showed that the conformations of HSA/BSA altered in the presence of ergosterol. The thermodynamic parameters, free energy change (ΔG), enthalpy change (ΔH) and entropy change (ΔS) for BSA–ergosterol and HSA–ergosterol systems were calculated by the van’t Hoff equation and discussed. Besides, with the aid of three site markers (for example, phenylbutazone, ibuprofen and digitoxin), we have reported that ergosterol primarily binds to the tryptophan residues of BSA/HSA within site I (subdomain II A).
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The author gratefully acknowledges financial support by the Education Department of Sichuan Province (12ZA171).
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Cheng, Z. Interaction of ergosterol with bovine serum albumin and human serum albumin by spectroscopic analysis. Mol Biol Rep 39, 9493–9508 (2012). https://doi.org/10.1007/s11033-012-1814-6
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DOI: https://doi.org/10.1007/s11033-012-1814-6