(A) Structure of the P450(Biol)-ACP-tetradecanoic acid complex near the vicinity of the active showing the F, G, and I helices (in pink), the ACP-bound substrate (in green) and catalytically important residues (in magenta). (B) A docking model of the putative Orf6* complex with the F, G, and I helices colored in cyan. This model suggests that Met226 and Gln230, which are conserved only among Orf6* orthologues, may play roles in steering and stabilizing the extended peptide substrate.