NDLI: Identification of O-GlcNAc sites within peptides of the Tau protein and their impact on phosphorylation

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Molecular BioSystems Vol - 7 Issue - 4

Molecular BioSystems Vol - 7 Issue - 3

Molecular BioSystems Vol - 7 Issue - 2

Molecular BioSystems Vol -6

Molecular BioSystems Vol -5

Molecular BioSystems Vol -4

Molecular BioSystems Vol -3

Molecular BioSystems Vol -2

Identification of O-GlcNAc sites within peptides of the Tau protein and their impact on phosphorylation

Content Provider	Royal Society of Chemistry (RSC)
Author	Wieruszeski, Jean-Michel Rolando, Christian Hackenberger, Christian P. R. Broncel, Malgorzata Lippens, Guy Smet-Nocca, Caroline Hanoulle, Xavier Landrieu, Isabelle Tokarski, Caroline Leroy, Arnaud
Copyright Year	2011
Abstract	Phosphorylation of the microtubule-associated Tau protein plays a major role in the regulation of its activity of tubulin polymerization and/or stabilization of microtubule assembly. A dysregulation of the phosphorylation/dephosphorylation balance leading to the hyperphosphorylation of Tau proteins in neurons is thought to favor their aggregation into insoluble filaments. This in turn might underlie neuronal death as encountered in many neurodegenerative disorders, including Alzheimer's disease. Another post-translational modification, the O-linked β-N-acetylglucosaminylation (O-GlcNAcylation), controls the phosphorylation state of Tau, although the precise mechanism is not known. Moreover, analytical difficulties have hampered the precise localization of the O-GlcNAc sites on Tau, except for the S400 site that was very recently identified on the basis of ETD-FT-MS. Here, we identify three O-GlcNAc sites by screening a library of small peptides sampling the proline-rich, the microtubule-associated repeats and the carboxy-terminal domains of Tau as potential substrates for the O-β-N-acetylglucosaminyltransferase (OGT). The in vitro activity of the nucleocytoplasmic OGT was assessed by tandem mass spectrometry and NMR spectroscopy. Using phosphorylated peptides, we establish the relationship between phosphate and O-GlcNAc incorporation at these sites. Phosphorylation of neighboring residues S396 and S404 was found to decrease significantly S400 O-GlcNAcylation. Reciprocally, S400 O-GlcNAcylation reduces S404 phosphorylation by the CDK2/cyclinA3 kinase and interrupts the GSK3β-mediated sequential phosphorylation process.
Starting Page	1420
Ending Page	1429
Page Count	10
File Format	HTM / HTML PDF
ISSN	1742206X
Volume Number	7
Issue Number	5
Journal	Molecular BioSystems
DOI	10.1039/c0mb00337a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Post-translational modification Cyclin-dependent kinase 2 Phosphorylation Tubulin Tau protein Kinase Polymerization Tau Microtubule Library Nuclear magnetic resonance Mass spectrometry
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Biotechnology

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