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O-GlcNAcylation enhances CPS1 catalytic efficiency for ammonia and promotes ureagenesis

  • Leandro R. Soria (Lead / Corresponding author)
  • , Georgios Makris
  • , Alfonso M. D'Alessio
  • , Angela De Angelis
  • , Iolanda Boffa
  • , Veronica M. Pravata
  • , Véronique Rüfenacht
  • , Sergio Attanasio
  • , Edoardo Nusco
  • , Paola Arena
  • , Andrew T. Ferenbach
  • , Debora Paris
  • , Paola Cuomo
  • , Andrea Motta
  • , Matthew Nitzahn
  • , Gerald S. Lipshutz
  • , Ainhoa Martínez-Pizarro
  • , Eva Richard
  • , Lourdes R. Desviat
  • , Johannes Häberle
  • Daan M. F. van Aalten, Nicola Brunetti-Pierri (Lead / Corresponding author)

    Research output: Contribution to journalArticlepeer-review

    205 Downloads (Pure)

    Abstract

    Life-threatening hyperammonemia occurs in both inherited and acquired liver diseases affecting ureagenesis, the main pathway for detoxification of neurotoxic ammonia in mammals. Protein O-GlcNAcylation is a reversible and nutrient-sensitive post-translational modification using as substrate UDP-GlcNAc, the end-product of hexosamine biosynthesis pathway. Here we show that increased liver UDP-GlcNAc during hyperammonemia increases protein O-GlcNAcylation and enhances ureagenesis. Mechanistically, O-GlcNAcylation on specific threonine residues increased the catalytic efficiency for ammonia of carbamoyl phosphate synthetase 1 (CPS1), the rate-limiting enzyme in ureagenesis. Pharmacological inhibition of O-GlcNAcase, the enzyme removing O-GlcNAc from proteins, resulted in clinically relevant reductions of systemic ammonia in both genetic (hypomorphic mouse model of propionic acidemia) and acquired (thioacetamide-induced acute liver failure) mouse models of liver diseases. In conclusion, by fine-tuned control of ammonia entry into ureagenesis, hepatic O-GlcNAcylation of CPS1 increases ammonia detoxification and is a novel target for therapy of hyperammonemia in both genetic and acquired diseases.

    Original languageEnglish
    Article number5212
    Number of pages14
    JournalNature Communications
    Volume13
    DOIs
    Publication statusPublished - 5 Sept 2022

    Keywords

    • Acetylglucosamine
    • Ammonia/metabolism
    • Animals
    • Carbamoyl-Phosphate Synthase (Ammonia)/genetics
    • Disease Models, Animal
    • Hyperammonemia/genetics
    • Mammals/metabolism
    • Mice
    • N-Acetylglucosaminyltransferases/genetics
    • Propionic Acidemia
    • Protein Processing, Post-Translational
    • Urea/metabolism
    • Uridine Diphosphate/metabolism

    ASJC Scopus subject areas

    • General
    • General Physics and Astronomy
    • General Chemistry
    • General Biochemistry,Genetics and Molecular Biology

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