Intercalation binding of food antioxidant butylated hydroxyanisole to calf thymus DNA.
Intercalation binding of food antioxidant butylated hydroxyanisole to calf thymus DNA.
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DOI：
10.1016/j.jphotobiol.2014.10.011
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Langhong Wang;Guowen Zhang;Jun-hui Pan;Chunhong Xiong;D. Gong
中科院分区：
文献类型：
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作者：
Langhong Wang;Guowen Zhang;Jun-hui Pan;Chunhong Xiong;D. Gong
研究了食品抗氧化剂丁基羟基茴香醚（BHA）与小牛胸腺DNA（ctDNA）在pH 7.4缓冲液中的结合特性。基于荧光、紫外-可见吸收、圆二色性（CD）、粘度测量和自动对接技术的实验结果证实了BHA与ctDNA之间的嵌入结合。BHA诱导ctDNA的傅里叶变换红外光谱的变化表明BHA更倾向于与ctDNA的富含G-C的区域结合，这一点通过分子对接研究得到了进一步证实。CD谱分析表明，这种结合作用导致了DNA从B样构象向A样构象的转变。BHA与ctDNA的复合主要由氢键和疏水力驱动。在298、304和310 K下，BHA-ctDNA复合物的结合常数分别为2.03 × 104、1.92 × 104和1.59 × 104 L mol− 1。凝胶电泳结果表明，插入BHA分子对质粒DNA没有显着影响。此外，采用多元曲线分辨-交替最小二乘法对扩增的紫外-可见光谱数据矩阵进行解析，得到了体系中三种反应组分（BHA、ctDNA和BHA-ctDNA复合物）的浓度分布和光谱，为估计BHA-ctDNA相互作用的进展提供了定量数据。该研究有望为BHA与ctDNA的相互作用机制提供新的见解。
The binding properties of food antioxidant butylated hydroxyanisole (BHA) associated with calf thymus DNA (ctDNA) in physiological buffer (pH 7.4) were investigated. Experimental results based on fluorescence, UV–vis absorption, circular dichroism (CD), viscosity measurements and autodocking techniques confirmed the intercalation binding between BHA and ctDNA. The changes in Fourier transform infrared spectra of ctDNA induced by BHA suggested that BHA was more prone to bind to G–C rich region of ctDNA, which was further ascertained with the molecular docking studies. Analysis of the CD spectra indicated that this binding interaction led to a transformation from B-like DNA structure toward A-like conformation. The complexation of BHA with ctDNA was driven mainly by hydrogen bonds and hydrophobic forces. The binding constants of the BHA–ctDNA complex were calculated to be 2.03 × 104, 1.92 × 104and 1.59 × 104L mol−1at 298, 304 and 310 K, respectively. Gel electrophoresis results suggested that intercalated BHA molecules did not significantly affect plasmid DNA. Moreover, the concentration profiles and the spectra for the three reaction components (BHA, ctDNA, and BHA–ctDNA complex) of the system by resolving the augmented UV–vis spectral data matrix with the use of multivariate curve resolution-alternating least squares approach provided quantitative data to estimate the progress of BHA–ctDNA interaction. This study is expected to provide new insights into the mechanism of interaction between BHA and ctDNA.