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Biophysical investigation of thymoquinone binding to 'N' and 'B' isoforms of human serum albumin: exploring the interaction mechanism and radical scavenging activity

机译:人血清白蛋白对'N'和'B'同种型的生物物理研究:探索相互作用机制和自由基清除活性

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摘要

Thymoquinone (TQ) is the main constituent of Nigella sativa and is traditionally used as a folk medicine. Our aim was to investigate the binding mechanism of TQ to human serum albumin (HSA) isoforms ('N' form at pH 7.4 and 'B' form at pH 9.0) using biophysical methods such as intrinsic tryptophan fluorescence quenching, isothermal titration calorimetry (ITC), circular dichroism (CD), dynamic light scattering (DLS), Forster resonance energy transfer (FRET) and antioxidant activity in the absence and presence of TQ. We have calculated the binding and thermodynamic parameters from spectroscopic and calorimetric methods. CD and DLS were respectively used to monitor the changes in the secondary structure and hydrodynamic radii of HSA as a result of its interaction with TQ. The esterase and antioxidant or radical scavenging activities of both the isoforms of HSA were investigated in the absence/presence of TQ. The antioxidant activity of TQ was remarkably enhanced upon its interaction with HSA. Therefore, the efficiency of HSA to scavenge the free radical ions was increased in the presence of TQ which is generated in the body by various metabolic processes.
机译:胸腺喹诺酮(TQ)是Nigella Sativa的主要组成部分,传统上用作民间医学。我们的目的是研究TQ对人血清白蛋白(HSA)同种型的结合机制(在pH7.4的pH7.4和pH90的'形式)使用生物物理方法,例如本征色氨酸荧光猝灭,等温滴定热量法(ITC) ),圆形二中间(CD),动态光散射(DLS),福尔斯特共振能量转移(FRET)和抗氧化活性在没有和存在TQ的情况下。我们已经计算了光谱和量热方法的结合和热力学参数。 CD和DLS分别用于监测HSA的二级结构和流体动力半径的变化,因为其与TQ的相互作用。在TQ的缺失/存在下,研究了HSA同种型的酯酶和抗氧化剂或自由基清除活性。在其与HSA的相互作用时显着提高了TQ的抗氧化活性。因此,在通过各种代谢过程中在体内产生的TQ存在下,HSA以清除自由基离子的效率。

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  • 来源
    《RSC Advances》 |2015年第24期|共15页
  • 作者单位

    Aligarh Muslim Univ Interdisciplinary Biotechnol Unit Aligarh 202002 Uttar Pradesh India;

    Aligarh Muslim Univ Interdisciplinary Biotechnol Unit Aligarh 202002 Uttar Pradesh India;

    Jamia Millia Islamia Dept Comp Sci New Delhi 110025 India;

    Aligarh Muslim Univ Interdisciplinary Biotechnol Unit Aligarh 202002 Uttar Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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