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    • 6. 发明申请
    • LUMINESCENCE-BASED METHODS AND PROBES FOR MEASURING CYTOCHROME P450 ACTIVITY
    • 用于测量细胞色素P450活性的基于发光的方法和探针
    • WO2004027378A2
    • 2004-04-01
    • PCT/US2003/029078
    • 2003-09-16
    • PROMEGA CORPORATIONCALI, James, J.KLAUBERT, DieterDAILY, WilliamHO, Samuel, Kin, SangFRACKMAN, SusanHAWKINS, ErikaWOOD, Keith, V.
    • CALI, James, J.KLAUBERT, DieterDAILY, WilliamHO, Samuel, Kin, SangFRACKMAN, SusanHAWKINS, ErikaWOOD, Keith, V.
    • G01N
    • G01N33/502A61K49/0008C07D417/04C12Q1/66G01N33/5088G01N33/582G01N2333/90245G01N2333/90251G01N2500/10
    • The present invention provides methods, compositions, substrates, and kits useful for analyzing the metabolic activity in cells, tissue, and animals and for screening test compounds for their effect on cytochrome P450 activity. In particular, a one-step and two-step methods using luminogenic molecules, e.g. luciferin or coelenterazines, that are cytochrome P450 substrates and that are also bioluminescent enzyme, e.g., luciferase, pro-substrates are provided. Upon addition of the luciferin derivative or other luminogenic molecule into a P450 reaction, the P450 enzyme metabolizes the molecule into a bioluminescent enzyme substrate, e.g., luciferin and/or luciferin derivative metabolite, in a P450 reaction. The resulting metabolite(s) serves as a substrate of the bioluminescent enzyme, e.g., luciferase, in a second light­generating reaction. Luminescent cytochrome P450 assays with low background signals and high sensitivity are disclosed and isoform selectivity is demonstrated. The present invention also provides an improved method for performing luciferase reactions which employs added pyrophosphatase to remove inorganic pyrophosphate, a luciferase inhibitor which may be present in the reaction mixture as a contaminant or may be generated during the reaction. The present method further provides a method for stabilizing and prolonging the luminescent signal in a luciferase-based assay using luciferase stabilizing agents such as reversible luciferase inhibitors.
    • 本发明提供了用于分析细胞,组织和动物中的代谢活性并筛选测试化合物对细胞色素P450活性的影响的方法,组合物,底物和试剂盒。 特别地,使用发光分子的一步法和两步法,例如, 荧光素或腔肠素,它们是细胞色素P450底物,也是生物发光酶,例如萤光素酶,原底物。 在将荧光素衍生物或其他发光分子加入到P450反应中后,P450酶在P450反应中将该分子代谢成生物发光酶底物,例如荧光素和/或荧光素衍生物代谢物。 产生的代谢物在第二次光照和害羞中作为生物发光酶的底物,例如萤光素酶,产生反应。 公开了具有低背景信号和高灵敏度的发光细胞色素P450测定并证明了同种型选择性。 本发明还提供了用于进行萤光素酶反应的改进方法,其使用添加的焦磷酸酶去除无机焦磷酸盐,荧光素酶抑制剂,其可以作为污染物存在于反应混合物中或可以在反应过程中产生。 本发明方法进一步提供了使用荧光素酶稳定剂如可逆荧光素酶抑制剂在基于萤光素酶的测定中稳定和延长发光信号的方法。