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Study on the interaction of paeoniflorin with human serum albumin (HSA) by spectroscopic and molecular docking techniques

机译:光谱和分子对接技术研究pa药苷与人血清白蛋白(HSA)的相互作用

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摘要

The interaction of paeoniflorin with human serum albumin (HSA) was investigated using fluorescence, UV–vis absorption, circular dichroism (CD) spectra and molecular docking techniques under simulative physiological conditions. The results clarified that the fluorescence quenching of HSA by paeoniflorin was a static quenching process and energy transfer as a result of a newly formed complex (1:1). Paeoniflorin spontaneously bound to HSA in site I (subdomain IIA), which was primarily driven by hydrophobic forces and hydrogen bonds (ΔH° = − 9.98 kJ mol−1, ΔS° = 28.18 J mol−1 K−1). The binding constant was calculated to be 1.909 × 103 L mol−1 at 288 K and it decreased with the increase of the temperature. The binding distance was estimated to be 1.74 nm at 288 K, showing the occurrence of fluorescence energy transfer. The results of CD and three-dimensional fluorescence spectra showed that paeoniflorin induced the conformational changes of HSA. Meanwhile, the study of molecular docking also indicated that paeoniflorin could bind to the site I of HSA mainly by hydrophobic and hydrogen bond interactions.
机译:在模拟生理条件下,使用荧光,紫外可见吸收,圆二色性(CD)光谱和分子对接技术研究了eon药苷与人血清白蛋白(HSA)的相互作用。结果表明,pa药苷对HSA的荧光猝灭是静态猝灭过程,并且是新形成的复合物(1:1)导致的能量转移。 eon药苷自发地与位置I(亚结构域IIA)上的HSA结合,这主要由疏水力和氢键(ΔH°= -9.98kJmol -1 ,ΔS°= 28.18Jmol -1 K -1 )。在288 K下的结合常数经计算为1.909×10 3 L mol -1 ,并随温度的升高而降低。在288 K下的结合距离估计为1.74 nm,表明发生了荧光能量转移。 CD和三维荧光光谱的结果表明pa药苷诱导HSA的构象变化。同时,分子对接的研究还表明pa药苷可以主要通过疏水和氢键相互作用与HSA的I位结合。

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