Studies on the interactions of 3,6-diaminoacridine derivatives with human serum albumin by fluorescence spectroscopy
作者:Elmas Gökoğlu、Fulya Kıpçak、Zeynel Seferoğlu
DOI:10.1002/bio.2635
日期:2014.11
This study reports the preparation and investigation of the modes of binding of the two symmetric 3,6-diaminoacridine derivatives obtained from proflavine, which are 3,6-diphenoxycarbonyl aminoacridine and 3,6-diethoxycarbonyl aminoacridine to human serum albumin (HSA). The interaction of HSA with the derivatives was investigated using fluorescence quenching and ultraviolet-visible absorption spectra at pH 7.2 and different temperatures. The results suggest that the derivatives used can interact strongly with HSA and are the formation of HSA-derivative complexes and hydrophobic interactions as the predominant intermolecular forces in stabilizing for each complex. The Stern-Volmer quenching constants, binding constants, binding sites and corresponding thermodynamic parameters ΔH, ΔS and ΔG were calculated at different temperatures. The binding distance (r) ~ 3 nm between the donor (HSA) and acceptors (3,6-diethoxycarbonyl aminoacridine, 3,6-diphenoxycarbonyl aminoacridine and proflavine) was obtained according to Förster's non-radiative energy transfer theory. Moreover, the limit of detection and limit of quantification of derivatives were calculated in the presence of albumin. Copyright © 2014 John Wiley & Sons, Ltd.
本研究报告了从丙黄嘌呤中得到的两种对称的 3,6-二氨基吖啶衍生物(3,6-二苯氧羰基氨基吖啶和 3,6-二乙氧羰基氨基吖啶)的制备过程以及它们与人血清白蛋白(HSA)的结合模式。在 pH 值为 7.2 和不同温度下,利用荧光淬灭和紫外可见吸收光谱研究了 HSA 与这些衍生物的相互作用。结果表明,所使用的衍生物能与 HSA 发生强烈的相互作用,并形成 HSA 衍生物复合物,疏水相互作用是稳定每种复合物的主要分子间作用力。计算了不同温度下的 Stern-Volmer 淬火常数、结合常数、结合位点和相应的热力学参数 ΔH、ΔS 和 ΔG。根据佛斯特非辐射能量转移理论,得到了供体(HSA)与受体(3,6-二乙氧羰基氨基吖啶、3,6-二苯氧羰基氨基吖啶和丙黄嘌呤)之间的结合距离(r)~3 nm。此外,还计算了在白蛋白存在下衍生物的检出限和定量限。Copyright © 2014 John Wiley & Sons, Ltd. All Rights Reserved.