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- W2121454107 abstract "Binding interaction of sulfamethazine (SMZ) with human immunoglobulin G (HIgG) has been explored under physiological conditions. The interaction mechanism was firstly predicted through molecular modeling which showed that several hydrogen bonds participated in stabilizing the SMZ − HIgG complex. Fluorescence spectroscopy, ultraviolet–visible (UV–vis) light absorption and circular dichroism (CD) spectroscopy were used to analyze the binding site, binding constants and effects of SMZ on HIgG stability and secondary structure. The binding parameters and thermodynamic parameters at different temperatures for the reaction have been calculated according to the Scatchard, Sips and Van 't Hoff equations, respectively. Experimental results showed that the quenching mechanism was a static quenching and there was one independent class of binding site on HIgG for SMZ during their interaction. The thermodynamic parameters of the reaction, namely standard enthalpy ΔH0 and entropy ΔS0, had been calculated to be −19.12 kJ · mol−1 and 20.22 J · mol−1 · K−1, respectively, which meant that the electrostatic interaction was the predominant intermolecular force in stabilizing the SMZ − HIgG complex. Moreover, the conformational changes of HIgG in the presence of SMZ were confirmed by three-dimensional fluorescence spectroscopy, UV–vis absorption spectroscopy and CD spectroscopy. Copyright © 2014 John Wiley & Sons, Ltd." @default.
- W2121454107 created "2016-06-24" @default.
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- W2121454107 date "2014-12-04" @default.
- W2121454107 modified "2023-10-16" @default.
- W2121454107 title "Mechanistic and conformational studies on the interaction of sulfamethazine with human immunoglobulin G by molecular modeling and multi-spectroscopic approach<i>in vitro</i>" @default.
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- W2121454107 doi "https://doi.org/10.1002/bio.2822" @default.
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