Figure 1.

Pathways for alginate and poly-β-hydroxybutyrate (PHB) biosynthesis and their metabolic relations in Azotobacter vinelandii. Dashed arrows indicate multi-enzyme pathways; the enzyme names and their abreviations are indicated in green and the corresponding genes are in red. PMI, phosphomannose isomerase; GMP, guanosine diphosphomannose pyrophosphorylase; PMM, phosphomannomutase; GMD, GDP-mannose dehydrogenase; MP, mannuronate polymerase; ME, mannuronate epimerase AlgG; MEs, mannuronate epimerases AlgE1 to 7.