Eukaryotic UGPase-like includes UDPase and UDPGlcNAc pyrophosphorylase enzymes.
This family includes UDP-Glucose Pyrophosphorylase (UDPase) and UDPGlcNAc pyrophosphorylase enzymes. The two enzymes share significant sequence and structure similarity. UDP-Glucose Pyrophosphorylase catalyzes a reversible production of UDP-Glucose and pyrophosphate (PPi) from Glucose-1-phosphate and UTP. UDP-glucose plays pivotal roles in galactose utilization, in glycogen synthesis, and in the synthesis of the carbohydrate moieties of glycolipids , glycoproteins , and proteoglycans . UDP-N-acetylglucosamine (UDPGlcNAc) pyrophosphorylase (UAP) (also named GlcNAc1P uridyltransferase), catalyzes the reversible conversion of UTP and GlcNAc1P from PPi and UDPGlcNAc, which is a key precursor of N- and O-linked glycosylations and is essential for the synthesis of chitin (a major component of the fungal cell wall) and of the glycosylphosphatidylinositol (GPI) linker anchoring a variety of cell surface proteins to the plasma membrane. In bacteria, UDPGlcNAc represents an essential precursor for both peptidoglycan and lipopolysaccharide biosynthesis.
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