Abstract
The interaction of human serum albumin (HSA) with propofol has been studied by fluorescence spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, circular dichroism (CD) spectroscopy and docking methods. A gradual decrease in Stern–Volmer quenching constants with the increase in temperature showed the static mode of fluorescence quenching. The obtained binding constant (KA) was 8.18×105M−1. Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) changes were calculated, which revealed that the reaction is spontaneous, exothermic and hydrophobic force driven. FT-IR test revealed conformational changes of the protein and destruction of H-bonding upon interaction. Moreover, propofol induced a decrease in α-helical contents probably with increment of random coils or/and β-sheets of HSA, as observed from the far-UV CD spectra. Molecular docking and site probing study depicted that propofol fits into the hydrophobic pocket close to Sudlow site I in domain IIA of HSA. The present study will be helpful in understanding the binding mechanism of propofol and associated stability and conformational changes.
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