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Uridine diphosphate N-acetylglucosamine

Uridine diphosphate N-acetylglucosamine or UDP-GlcNAc is a nucleotide sugar and a coenzyme in metabolism. It is used by glycosyltransferases to transfer N-acetylglucosamine residues to substrates. UDP-GlcNAc is used for making glycosaminoglycans, proteoglycans, and glycolipids. D-Glucosamine is made naturally in the form of glucosamine-6-phosphate, and is the biochemical precursor of all nitrogen-containing sugars. To be specific, glucosamine-6-phosphate is synthesized from fructose 6-phosphate and glutamine as the first step of the hexosamine biosynthesis pathway. International Union of Biochemistry and Molecular Biology The end-product of this pathway is UDP-GlcNAc. Some enzymes involved in the biosynthesis of UDP-GlcNAc vary between prokaryotic and eukaryotic organisms, serving as potential drug targets for antibiotic development.

Biosignaling

UDP-GlcNAc is extensively involved in intracellular signaling as a substrate for O-linked N-acetylglucosamine transferases (OGTs) to install the O-GlcNAc post-translational modification in a wide range of species. It is also involved in nuclear pore formation and nuclear signalling. OGTs and OG-ases play an important role in the structure of the cytoskeleton. In mammals, there is enrichment of OGT transcripts in the pancreas beta-cells, and UDP-GlcNAc is thought to be part of the glucose sensing mechanism. There is also evidence that it plays a part in insulin sensitivity in other cells. In plants, it is involved in the control of gibberellin production. In eukaryotic stem cells, the presence of UDP-GlcNAc is essential for maintaining pluripotency, which is sustained through O-GlcNAcylation.

Clostridium novyi type A alpha-toxin is an O-linked N-actetylglucosamine transferase acting on Rho proteins and causing the collapse of the cytoskeleton.

There is a possible relationship between the inhibition of oxidative phosphorylation and reduced UDP-GlcNAc levels.

Prokaryotic and eukaryotic biosynthesis

UDP-GlcNAc biosynthesis is not regulated by the same enzymes in prokaryotic and eukaryotic organisms. The lack of the bifunctional GlmU acetyltransferase and pyrophosphorylase in eukaryotes makes it a possible target for blocking UDP-GlcNAc synthesis (an essential precursor for peptidoglycan synthesis) in bacteria without affecting host cells.

References

References

  1. (2006). "Enzymes of UDP-GlcNAc biosynthesis in yeast". Yeast.
  2. (2001). "Reflections on glycobiology". The Journal of Biological Chemistry.
  3. (1960-05-01). "Glucosamine Metabolism". Journal of Biological Chemistry.
  4. (2022). "Biosynthesis of uridine diphosphate N-Acetylglucosamine: An underexploited pathway in the search for novel antibiotics?". IUBMB Life.
  5. (2001). "Glycan-dependent signaling: O-linked N-acetylglucosamine". The FASEB Journal.
  6. (2023-05-01). "Oxidative phosphorylation safeguards pluripotency via UDP-N-acetylglucosamine". Protein & Cell.
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