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. 2012 Jun 20;7(6):e39522. doi: 10.1371/journal.pone.0039522

Figure 1. Carotenoid biosynthetic pathway and the genes involved in the biosynthesis of zeaxanthin in Sphingobium yanoikuyae XLDN2-5.

Figure 1

(A) Genetic organization of the crt genes in strain XLDN2-5 compared to similar gene clusters from other bacteria. (B) The proposed carotenoid biosynthetic pathway in strain XLDN2-5 is inside the red box. CrtE: GGPP synthase (orange); CrtB: Phytoene synthase (green); CrtI: Phytoene dehydrogenase (red); CrtY: Lycopene cyclase (blue); CrtZ: β-Carotene hydroxygenase (magenta); CrtW: β-Carotene ketolase (black); CrtX: Zeaxanthin glucosyltransferase (purple); orfX1 and orfX2: No predicted function (grey). The percent of numbers represents the amino acid (aa) identities of related enzymes.