Investigation of metabolite-protein interactions by transient absorption spectroscopy and in silico methods
作者:Daniel Limones-Herrero、Fabrizio Palumbo、Victoria Vendrell-Criado、Inmaculada Andreu、Emilio Lence、Concepción González-Bello、Miguel A. Miranda、M. Consuelo Jiménez
DOI:10.1016/j.saa.2019.117652
日期:2020.2
ligand exhibited higher ΔAmax values measured after the laser pulse and were also considerably longer-lived than the non-complexed forms. This is in agreement with an enhanced hydrophilicity of the metabolites, due to the replacement of methyl groups with H that led to a lower extent of protein binding. For the three compounds, laser flash photolysis displacement experiments using warfarin or ibuprofen
瞬态吸收光谱结合计算机方法已用于研究人血清白蛋白(HSA)与抗精神病药氯丙嗪(CPZ)及其两种脱甲基代谢产物(MCPZ和DCPZ)之间的相互作用。因此,将含有CPZ,MCPZ或DCPZ和HSA(摩尔配体:蛋白质比例为1:0和1:3)的溶液进行激光闪光光解,对应于三重激发态的λ= 470 nm处的ΔAmax为。被监视。在所有情况下,与蛋白质结合的配体在激光脉冲后均显示出较高的ΔAmax值,并且比非复合形式的寿命更长。这与代谢物的亲水性增强相一致,这是由于用H取代了甲基导致了较低程度的蛋白质结合。对于这三种化合物,使用华法令或布洛芬的激光闪光光解置换实验表明,Sudlow位点I为主要结合位点。对接和分子动力学模拟研究表明,两个脱甲基配体与HSA的结合方式将与CPZ显着不同,特别是对于DCPZ,这似乎是由于它们的末端铵基团与氢负键稳定氢键相互作用的能力不同蛋白质袋(Glu153,Glu292)中