Citation: GUO Qing-Lian, PAN Ling-Li, YANG Li-Yun, HE Huan, ZHANG Ye-Zhong, LIU Yi. Thermodynamics of the Interaction of Imidacloprid with Human Serum Albumin[J]. Acta Physico-Chimica Sinica, ;2016, 32(1): 274-282. doi: 10.3866/PKU.WHXB201511021
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The thermodynamics of the interaction between human serum albumin (HSA) and imidacloprid (IMI) was investigated using fluorescence, UV-Vis absorbance, and circular dichroism spectroscopy, in addition to molecular modeling under physiological conditions. The fluorescence quenching of HSA by IMI was a static process, which was confirmed by the UV-Vis absorption spectra. The calculated enthalpy (ΔH) and entropy (ΔS) changes implied that hydrogen bonds and van der Waals forces played a predominant role in the binding process. Site marker competitive experiments along with molecular docking indicated that the binding of IMI to HSA took place primarily in site Ⅰ. The circular dichroism and synchronous fluorescence spectroscopy demonstrated that the secondary structure of HSA changed after its interaction with IMI, causing the α-helix content to decrease with an increase in anunordered structure. The peptide structure extended after binding with IMI.
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