Covalent Protein Modification by Reactive Drug Metabolites Using Online Electrochemistry/Liquid Chromatography/Mass Spectrometry
作者:Wiebke Lohmann、Heiko Hayen、Uwe Karst
DOI:10.1021/ac801699g
日期:2008.12.15
We present a rapid and convenient method to perform and evaluate the covalent protein binding of reactive phase I metabolites. The oxidative metabolism of the drugs paracetamol, amodiaquine, and clozapine is simulated in an electrochemical (EC) flow-through cell, which is coupled online to an LC/MS system. Adduct formation of the reactive metabolites with the proteins β-lactoglobulin A and human serum albumin proceeds in a reaction coil between EC cell and injection system of the HPLC system. The formed drug−protein adducts are characterized with online time-of-flight mass spectrometry, and the modification site is localized using FTICR-mass spectrometry. Due to its simple setup, easy handling, and short analysis times, the method provides an interesting tool for the rapid risk assessment of covalent protein binding as well as for the synthesis of covalent drug−protein adducts in high purity and high yield.
我们提出了一种快速便捷的方法来执行和评估反应性 I 相代谢物的共价蛋白结合。药物扑热息痛、阿莫地喹和氯氮平的氧化代谢在电化学 (EC) 流通池中进行模拟,该池与 LC/MS 系统在线耦合。反应性代谢物与蛋白质β-乳球蛋白A和人血清白蛋白的加合物形成在EC细胞和HPLC系统的注射系统之间的反应线圈中进行。形成的药物-蛋白质加合物通过在线飞行时间质谱进行表征,并使用 FTICR 质谱定位修饰位点。由于其设置简单、操作方便且分析时间短,该方法为共价蛋白结合的快速风险评估以及高纯度和高产率的共价药物-蛋白加合物的合成提供了一种有趣的工具。