Time dependent HPLC analysis of the product ratio of enzymatically reduced prodrug CB1954 by a modified and immobilised nitroreductase
作者:Patrick Ball、Emma Thompson、Simon Anderson、Vanessa Gwenin、Chris Gwenin
DOI:10.1016/j.ejps.2018.11.001
日期:2019.1
to determine the hydroxylamine product ratios formed when reacted with CB1954. Time-dependent HPLC studies were carried out to assess how this ratio changes over time. It was shown that the hydroxylamine ratio formed by the reduction of CB1954 by a nitroreductase changes over time and that this change in ratio relates directly to the kinetics of the reaction. Thus, the hydroxylamine ratio measured using
定向酶前药疗法是一种化学疗法策略,利用前药激活酶在肿瘤部位激活前药,从而降低脱靶效应。与CB1954前药一起使用的最常研究的酶是来自大肠杆菌的NfnB硝基还原酶。文献指出,CB1954在2或4位上以1:1的比例被NfnB还原;在文献中已经观察到与该比率的偏差,但是没有进一步研究。基因修饰酶的动力学参数;评估了NfnB-his,NfnB-cys和AuNP-NfnB-cys,并使用HPLC分析来确定与CB1954反应时形成的羟胺产物比率。进行了与时间有关的HPLC研究,以评估该比率如何随时间变化。结果表明,由硝基还原酶还原CB1954形成的羟胺比率随时间变化,该比率的变化直接与反应动力学有关。因此,在给定的时间点使用HPLC测量的羟胺比率并不是真实地表明催化过程中硝基还原酶的偏好。这些结果质疑如何根据羟胺比率评估硝基还原酶,并且怀疑该现象也可能适用于其他酶/前药组合。