Modulation of O-GlcNAc glycosylation during Xenopus oocyte maturation.
Fiche publication
Date publication
novembre 2004
Auteurs
Membres identifiés du Cancéropôle Est :
Pr FLAMENT Stéphane
Tous les auteurs :
Lefebvre T, Baert F, Bodart JF, Flament S, Michalski JC, Vilain JP
Lien Pubmed
Résumé
O-linked N-acetylglucosamine (O-GlcNAc) glycosylation is a post-translational modification, which is believed antagonises phosphorylation. We have studied the O-GlcNAc level during Xenopus oocyte meiotic resumption, taking advantage of the high synchrony of this model which is dependent upon a burst of phosphorylation. Stimulation of immature stage VI oocytes using progesterone was followed by a 4.51 +/- 0.32 fold increase in the GlcNAc content, concomitantly to an increase in phosphorylation, notably on two cytoplasmic proteins of 66 and 97 kDa. The increase of O-GlcNAc for the 97 kDa protein, which we identified as beta-catenin was partly related to its accumulation during maturation, as was demonstrated by the use of the protein synthesis inhibitor--cycloheximide. Microinjection of free GlcNAc, which inhibits O-glycosylated proteins-lectins interactions, delayed the progesterone-induced maturation without affecting the O-GlcNAc content. Our results suggest that O-GlcNAc glycosylation could regulate protein-protein interactions required for the cell cycle kinetic.
Référence
J Cell Biochem. 2004 Nov 15;93(5):999-1010.