Figure 3.

Proposed biosynthetic pathways for deinoxanthin and for its derivative in Deinococcus sp. AJ005^T. The following enzymes are involved in these biosynthetic pathways: CrtE, GGPP synthase; CrtB, phytoene synthase; CrtI, phytoene desaturase; CrtLm, lycopene cyclase; CrtO, β-carotene 4-ketolase; CruF, C-1’,2’ hydratase; CrtD, C-3’,4’ desaturase; 2-β-ionone ring hydroxylase; and 2-β-ionone ring oxygenase (unidentified). The ? mark represents the possibility of oxido-reduction catalyzed by an unknown enzyme.