Superimposition between structures. (A) Region comprising G, H, and I helices and loops in between as a result of superimposition of CYP154C1 (1GWI), OxyB (1LFK), and EryF (1OXA) against CYP154A1 (1ODO). The superimposition was performed using SWISS-PDB VIEWER (Guex and Peitsch 1997). Five residues within the HI loop in CYP154A1, E221, G222, D223, G224, and D225 lack electron density and are omitted from the final model of CYP154A1 and absent in the figure. Colors are as follows: gray for CYP154A1, yellow for EryF, green for CYP154C1, and red for OxyB. (B) Region comprising F, G, H, and I helices as a result of superimposition between CYP119 structures in inhibitor free (1IO7), cyan; imidazole bound (1F4U), gold; and 4-phenylimidazole bound (1F4T), blue; viewed along the F helix.