Figure 1: Proposed overview of the pathway of vitamin B12 biosynthesis by P. denitrificans connects with central metabolism. Abbreviations: ACA, adenosyl cobyric acid; AcCoA, acetyl-CoA; APP, aminopropanol-o-2-phosphate; CIT, citrate; DMBI, dimethyl benzimidazole; F6P, fructose-6-phosphate; Gly, glycine; Glu, glutamate; G3P, glyceraldehyde-3-phosphate; G6P, glucose-6- phosphate; KDG, 2-Keto-3-deoxy-6-phosphogluconate; OAA, oxaloacetate;P5P, pentose-5-phosphate; PGA, 3-phosphate-glycerate; PYR, pyruvate; Ser, serine; SUC-CoA, succinyl-CoA; Thr, threonine; UPR, uroporphyrinogen III; α-KG, α-ketoglutarate;δ-ALA, δ-aminolevulinic acid.