CYP267A1 and CYP267B1 from Sorangium cellulosum So ce56 are Highly Versatile Drug Metabolizers
作者:F. Kern、Y. Khatri、M. Litzenburger、R. Bernhardt
DOI:10.1124/dmd.115.068486
日期:2016.2.26
The guidelines of the Food and Drug Administration and International Conference on Harmonization have highlighted the importance of drug metabolites in clinical trials. As a result, an authentic source for their production is of great interest, both for their potential application as analytical standards and for required toxicological testing. Since we have previously shown promising biotechnological potential of cytochromes P450 from the soil bacterium Sorangium cellulosum So ce56, herein we investigated the CYP267 family and its application for the conversion of commercially available drugs including nonsteroidal anti-inflammatory, antitumor, and antihypotensive drugs. The CYP267 family, especially CYP267B1, revealed the interesting ability to convert a broad range of substrates. We established substrate-dependent extraction protocols and also optimized the reaction conditions for the in vitro experiments and Escherichia coli– based whole-cell bioconversions. We were able to detect activity of CYP267A1 toward seven out of 22 drugs and the ability of CYP267B1 to convert 14 out of 22 drugs. Moderate to high conversions (up to 85% yield) were observed in our established whole-cell system using CYP267B1 and expressing the autologous redox partners, ferredoxin 8 and ferredoxin-NADP+ reductase B. With our existing setup, we present a system capable of producing reasonable quantities of the human drug metabolites 4′-hydroxydiclofenac, 2-hydroxyibuprofen, and omeprazole sulfone. Due to the great potential of converting a broad range of substrates, wild-type CYP267B1 offers a wide scope for the screening of further substrates, which will draw further attention to future biotechnological usage of CYP267B1 from S. cellulosum So ce56.
食品与药物管理局和国际协调会议的指导方针强调了药物代谢物在临床试验中的重要性。因此,无论是作为分析标准的潜在应用,还是所需的毒理学测试,生产代谢物的真实来源都是非常重要的。由于我们之前已经展示了来自土壤细菌 Sorangium cellulosum So ce56 的细胞色素 P450 具有良好的生物技术潜力,因此我们在此研究了 CYP267 家族及其在转化市售药物(包括非甾体抗炎药、抗肿瘤药和抗高血压药)中的应用。CYP267 家族,尤其是 CYP267B1,显示出了转化多种底物的有趣能力。我们建立了依赖底物的提取方案,还优化了体外实验和基于大肠杆菌的全细胞生物转化的反应条件。我们能够检测到 CYP267A1 对 22 种药物中 7 种药物的活性,以及 CYP267B1 对 22 种药物中 14 种药物的转化能力。在我们利用 CYP267B1 和表达自体氧化还原伙伴铁氧还蛋白 8 和铁氧还蛋白-NADP+还原酶 B 建立的全细胞系统中,我们观察到了中等到较高的转化率(产率高达 85%)。由于野生型 CYP267B1 具有转化多种底物的巨大潜力,因此为筛选更多底物提供了广阔的空间,这将引起人们对未来利用 S. cellulosum So ce56 的 CYP267B1 生物技术的进一步关注。