Fig. 2: LC-MS/MS chromatograms of CYP reconstitution assays using various sterol substrates.

Recombinant CYP5122A1 and CYP51 were reconstituted with (A) lanosterol, (B) 4,14-DMZ, (C) FF-MAS, (D) T-MAS, (E) zymosterol, and (F) 7-dehydrodesmosterol as the sterol substrates. The peaks of the internal standard cholesterol-d7 (black), substrates (blue), hydroxy metabolites (orange), aldehyde metabolites (cyan), carboxylate/formyloxy metabolites (purple), and 14-demethylated products (red) were indicated in the chromatograms. Peaks with asterisk were detected in both incubations with or without NADPH and hence considered as background signals.