P450-Glo™ Assays provide a luminescent method to measure cytochrome P450 (CYP) activity (1–4). The assays
measure the activities of CYP enzymes from recombinant and native sources and test the effects of drugs and new
chemical entities on CYP activities. All of these assays can be used for cell-free CYP inhibition studies. Many of these
assays also can be used for cell-based CYP induction assays. The P450-Glo™ Substrates are CYP enzyme substrates
that are proluciferins, derivatives of beetle luciferin [(4S)-4,5-dihydro-2-(6´-hydroxy-2´-benzothiazolyl)-4-thiazolecarboxylic acid]. The derivatives are converted by CYP enzymes to luciferin products. d-luciferin is formed and
detected in a second reaction with the Luciferin Detection Reagent (Figure 1 and Table 1). The amount of light
produced in the second reaction is proportional to CYP activity.