Figure 1.

Simplified carotenoid biosynthesis pathway in C. tepidum. Enzymes catalyzing known steps are next to arrows, and respective modifications are highlighted in pink. Some enzymes can modify multiple substrates, e.g. OH-γ-carotene glucoside laurate can be formed by sequential modifications to γ-carotene by CrtC, CruC, and CruD, respectively. The enzyme catalyzing the formation of 1′,2′-dihydrochlorobactene is unknown; the modification introduced by this enzyme is highlighted in green.