Abstract
Interaction of cyclodextrins (CDs) with the two most abundant proteins, namely human serum albumin (HSA) and bovine serum albumin (BSA), has been investigated using steady-state and time-resolved fluorometric techniques, circular dichroism measurements and molecular docking simulation. The study reveals that the three CDs interact differently on the fluorescence and fluorescence lifetimes of the serum albumins. However, fluorescence anisotropy and circular dichroism are not affected. Depending on their size, different CDs bind to the serum albumins in different positions, resulting in changes in the spectral behaviour of the proteins. Docking study suggests the probable binding sites of the three CDs with the proteins. Combined experimental and computational studies imply that sufficiently high concentration of CDs causes loosening of the rigid structures of these transport proteins, although their secondary structures remain intact. Thus, CDs are found to be safe for the serum proteins from the structural point of view.
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Financial supports from the Department of Science and Technology (DST) and Department of Biotechnology (DBT), Government of India, are gratefully acknowledged. S G thanks University Grants Commission (UGC) for his fellowship.
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Benesi–Hildebrand plots for both HSA and BSA, plot of normalized fluorescence of the proteins against the concentration of the different CDs, the analyzed fluorescence lifetime data of both the albumins in the presence of varying concentrations of the three CDs and variation of normalized lifetime values of BSA in the presence of varying concentrations three CDs are presented in the Supplementary information (see www.ias.ac.in/chemsci).
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GHOSH, S., PAUL, B.K. & CHATTOPADHYAY, N. Interaction of cyclodextrins with human and bovine serum albumins: A combined spectroscopic and computational investigation. J Chem Sci 126, 931–944 (2014). https://doi.org/10.1007/s12039-014-0652-6
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DOI: https://doi.org/10.1007/s12039-014-0652-6