2.7.1.162 synthesis an N-acetylhexosamine 1-kinase from Bifidobacterium infantis (NahK_15697), a guanosine 5'-diphosphate (GDP)-mannose pyrophosphorylase from Pyrococcus furiosus (PFManC), and an Escherichia coli inorganic pyrophosphatase (EcPpA) are used efficiently for a one-pot three enzyme synthesis of GDP-mannose, GDP-glucose, their derivatives, and GDP-talose from simple monosaccharides and derivatives in preparative scale 726089 2.7.1.162 synthesis the enzyme is used in the chemoenzymatic synthesis of UDP-GlcNAc and UDP-GlcNTFA attempted by three recombinant enzymes in a fed batch system, overview. The process can be used for the development of an efficient scalable process for the supply of UDP-monosaccharide donors for oligosaccharide synthesis 739523