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Interaction of catecholamine precursor l-Dopa with lysozyme: A biophysical insight.
International Journal of Biological Macromolecules 2018 April 2
The current study comprises of an inclusive biophysical study, enlightening the binding of L-3, 4-dihydroxyphenylalanine (l-Dopa) with human lysozyme (HL) and hen egg white lysozyme (HEWL). Spectroscopic and molecular docking tools have been utilized to study the interaction of l-Dopa with both HL and HEWL. Spectrofluorimetric measurements exhibited that l-Dopa quenched the HL and HEWL intrinsic fluorescence. A binding constant (Kb ) of ∼104 M-1 for both HL and HEWL was obtained, asserting a significant binding. Negative value of ΔG affirmed that the reaction between proteins and l-Dopa was spontaneous. Far-UV CD spectra revealed a boost to the proteins helical content in the presence of l-Dopa. Furthermore, DLS measurements displayed the decrease in hydrodynamic radii (Rh ) of HL and HEWL in the presence of l-Dopa. Molecular docking studies established that l-Dopa formed complexes with both the proteins through hydrogen bonding and hydrophobic interaction. The present study characterizing the l-Dopa interaction with lysozyme could be noteworthy in realizing both pharmaco-dynamics and/or -kinetics of drugs used in various diseases.
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