荧光光谱法和分子对接研究拉米夫定、依非韦伦、替诺福韦与牛血清白蛋白的相互作用及机制
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篇名: 荧光光谱法和分子对接研究拉米夫定、依非韦伦、替诺福韦与牛血清白蛋白的相互作用及机制
TITLE:
摘要: 目的:研究拉米夫定、依非韦伦、替诺福韦与牛血清白蛋白(BSA)的相互作用及其机制。方法:通过荧光光谱法研究不同温度下不同浓度的拉米夫定、依非韦伦、替诺福韦与BSA的结合反应,分别测定其荧光强度,根据Stern-Volmer方程等公式计算动态猝灭常数(KSV)、表观猝灭常数(Kq)、结合常数(KA)、结合位点(n)和热力学焓变(ΔH)、自由能变(ΔG)、熵变(ΔS),并运用Sybyl 6.7 Flex X模块建立这3种药物与BSA的分子对接模型。结果:3种药物与BSA相互作用的Kq均大于2.0×1010 L/(mol·s),且随温度的升高而降低,n均接近于1,其热力学函数ΔG<0、ΔS<0、ΔH<0。分子对接模型显示,3种药物主要与BSA的Sudlow部位Ⅰ亚结构域发生结合。结论:3种药物与BSA之间存在相互作用,荧光猝灭方式以静态猝灭为主,结合反应为自发分子作用过程,结合作用力均以氢键和范德华力为主。荧光试验和分子对接研究结果一致,两者可相互补充。
ABSTRACT: OBJECTIVE: To study the interaction between bovine serum albumin (BSA) with lamivudine, efavirenz, tenofovir and its mechanism. METHODS: Fluorescence spectroscopy was used to determine the interaction between BSA with different concentrations of lamivudine, efavirenz, tenofovir under different temperatures. The fluorescence intensity of them were determined respectively; quenching constant (KSV), apparent quenching constant (Kq), binding constant (KA), binding site (n), thermodynamic enthalpy change (ΔH), free energy diversification (ΔG) and entropy change (ΔS) were calculated according to Stern-Volmer equation and so on. Molecular docking model of 3 drugs with BSA was established by using Sybyl 6.7 Flex X model. RESULTS: Kq for the interaction between 3 drugs with BSA were all higher than 2.0×1010 L/(mol·s), and were decreased with the increase of temperature; all n were close to 1, and thermodynamic functions ΔG<0, ΔS<0, ΔH<0. Molecular docking model showed that 3 drugs were mainly bound with BSA at Sudlow Ⅰ subdomain site. CONCLUSIONS: There are the interaction between 3 drugs with BSA; fluorescence quenching mainly manifests as static quenching; binding reaction belongs to spontaneous molecular action process; binding force mainly includes hydrogen bond and Van der Waals’ force. The result of fluorescence experiment is consistent with those of molecular docking, and they complement each other.
期刊: 2017年第28卷第1期
作者: 刘荣
AUTHORS: LIU Rong
关键字: 拉米夫定;依非韦伦;替诺福韦;牛血清白蛋白;荧光光谱法;分子对接
KEYWORDS: Lamivudine; Efavirenz; Tenofovir; Bovine serum albumin; Fluorescence spectroscopy; Molecular docking
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