Apart from rhoptries, identification of Toxoplasma gondii's O-GlcNAcylated proteins reinforces the universality of the O-GlcNAcome

Moyira Osny Aquino-Gil, Mattis Kupferschmid, Hosam Shams-Eldin, Jörg Schmidt, Nao Yamakawa, Marlène Mortuaire, Frédéric Krzewinski, Stéphan Hardivillé, Edgar Zenteno, Christian Rolando, Fabrice Bray, Eduardo Pérez Campos, Jean François Dubremetz, Yobana Perez-Cervera, Ralph T. Schwarz, Tony Lefebvre

Research output: Contribution to journalArticlepeer-review

Abstract

O-linked β-N-acetylglucosaminylation or O-GlcNAcylation is a widespread post-translational modification that belongs to the large and heterogeneous group of glycosylations. The functions managed by O-GlcNAcylation are diverse and include regulation of transcription, replication, protein's fate, trafficking, and signaling. More and more evidences tend to show that deregulations in the homeostasis of O-GlcNAcylation are involved in the etiology of metabolic diseases, cancers and neuropathologies. O-GlcNAc transferase or OGT is the enzyme that transfers the N-acetylglucosamine residue onto target proteins confined within the cytosolic and nuclear compartments. A form of OGT was predicted for Toxoplasma and recently we were the first to show evidence of O-GlcNAcylation in the apicomplexans Toxoplasma gondii and Plasmodium falciparum. Numerous studies have explored the O-GlcNAcome in a wide variety of biological models but very few focus on protists. In the present work, we used enrichment on sWGA-beads and immunopurification to identify putative O-GlcNAcylated proteins in Toxoplasma gondii. Many of the proteins found to be O-GlcNAcylated were originally described in higher eukaryotes and participate in cell shape organization, response to stress, protein synthesis and metabolism. In a more original way, our proteomic analyses, confirmed by sWGA-enrichment and click-chemistry, revealed that rhoptries, proteins necessary for invasion, are glycosylated. Together, these data show that regardless of proteins strictly specific to organisms, O-GlcNAcylated proteins are rather similar among living beings.

Original languageEnglish (US)
Article number450
JournalFrontiers in Endocrinology
Volume9
Issue numberAUG
DOIs
StatePublished - Aug 20 2018

Keywords

  • O-GlcNAcome
  • O-GlcNAcylation
  • Proteomics
  • Rhoptries
  • T. gondii
  • Toxoplasmosis

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism

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