The binding interaction between bovine serum albumin (BSA) and sodium salt of risedronic acid (RSN) was studied by using the FT-IR (Fourier transform infrared), UV-Vis (ultraviolet–visible), fluorescence (emission and synchronous), CD (circular dichroism) spectrometric, and computational (molecular docking) techniques at 289, 297, and 305 K temperatures with physiological buffer of pH 7.40. The conformational and secondary structural changes observed for BSA from CD spectra and by curve fitting procedure were applied to Fourier self-deconvolution in FT-IR spectra. The formation of a BSA-RSN complex was confirmed from UV-Vis spectroscopy. The static type of quenching shown for RSN to BSA was verified from Stern–Volmer and modified Stern–Volmer equations. The binding constant of order 10⁵ was obtained to be confirming that there exists a strong binding interaction between BSA and RSN. Synchronous fluorescence shows that the microenvironment of tryptophan was altered, not tyrosine of BSA; in addition to this, the distance between tryptophan of BSA and RSN was found out from Forster’s theory of nonradiation energy transfer. The interaction between BSA and RSN mainly occurred as a result of hydrogen bonds and van der Waals forces, the process is exothermic and spontaneous, and it was achieved through van ’t Hoff equation. This interaction was affected by the presence of biologically active Fe²⁺, Ni²⁺, Ca²⁺, Mg²⁺, and Cd²⁺ ions and was also studied. The subdomain IIIA of BSA involved with RSN interaction was authenticated from molecular docking analysis.

中文翻译：

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多种光谱学和分子对接技术，用于研究牛血清白蛋白和利塞膦酸钠（一种用于骨骼疾病的双膦酸盐）之间的相互作用的生物物理研究。

使用FT-IR（傅立叶变换红外），UV-Vis（紫外可见），荧光（发射和同步），CD研究了牛血清白蛋白（BSA）和瑞斯膦酸钠盐（RSN）之间的结合相互作用。 （圆二色性）光谱和计算（分子对接）技术在289、297和305 K温度下使用pH 7.40的生理缓冲液。从CD光谱和通过曲线拟合程序观察到的BSA的构象和二级结构变化被应用于FT-IR光谱的傅里叶自解卷积。通过UV-Vis光谱确认了BSA-RSN复合物的形成。从Stern–Volmer和修改后的Stern–Volmer方程验证了从RSN到BSA的静态淬灭类型。结合常数10 ⁵证实了BSA和RSN之间存在强的结合相互作用。同步荧光显示，色氨酸的微环境发生了变化，而牛血清白蛋白没有改变。除此之外，从福斯特的非辐射能量转移理论中发现了BSA色氨酸与RSN之间的距离。BSA和RSN之间的相互作用主要是由于氢键和范德华力的作用，该过程是放热的，是自发的，这是通过van't Hoff方程实现的。这种相互作用受到具有生物活性的Fe 2 ⁺，Ni 2 ⁺，Ca 2 ⁺，Mg ²⁺和Cd ^{2+的影响。}离子也进行了研究。从分子对接分析验证了参与RSN相互作用的BSA的亚域IIIA。