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Originally published In Press as doi:10.1074/mcp.M200048-MCP200 on September 26, 2002.
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Molecular & Cellular Proteomics 1:791-804, 2002.
© 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

Research

Mapping Sites of O-GlcNAc Modification Using Affinity Tags for Serine and Threonine Post-translational Modifications*

Lance Wells{ddagger},§, Keith Vosseller{ddagger},§, Robert N. Cole{ddagger}, Janet M. Cronshaw, Michael J. Matunis and Gerald W. Hart{ddagger},||

{ddagger} Department of Biological Chemistry, Johns Hopkins University School of Medicine
Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21218

Identifying sites of post-translational modifications on proteins is a major challenge in proteomics. O-Linked ß-N-acetylglucosamine (O-GlcNAc) is a dynamic nucleocytoplasmic modification more analogous to phosphorylation than to classical complex O-glycosylation. We describe a mass spectrometry-based method for the identification of sites modified by O-GlcNAc that relies on mild ß-elimination followed by Michael addition with dithiothreitol (BEMAD). Using synthetic peptides, we also show that biotin pentylamine can replace dithiothreitol as the nucleophile. The modified peptides can be efficiently enriched by affinity chromatography, and the sites can be mapped using tandem mass spectrometry. This same methodology can be applied to mapping sites of serine and threonine phosphorylation, and we provide a strategy that uses modification-specific antibodies and enzymes to discriminate between the two post-translational modifications. The BEMAD methodology was validated by mapping three previously identified O-GlcNAc sites, as well as three novel sites, on Synapsin I purified from rat brain. BEMAD was then used on a purified nuclear pore complex preparation to map novel sites of O-GlcNAc modification on the Lamin B receptor and the nucleoporin Nup155. This method is amenable for performing quantitative mass spectrometry and can also be adapted to quantify cysteine residues. In addition, our studies emphasize the importance of distinguishing between O-phosphate versus O-GlcNAc when mapping sites of serine and threonine post-translational modification using ß-elimination/Michael addition methods.

|| To whom reprint requests should be addressed. E-mail: gwhart{at}jhmi.edu


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