Mapping of O-GlcNAc sites of 20 S proteasome subunits and Hsp90 by a novel biotin-cystamine tag.

Molecular & Cellular Proteomics : MCP
Thorsten OverathKatharina Janek

Abstract

The post-translational modification of proteins with O-GlcNAc is involved in various cellular processes including signal transduction, transcription, translation, and nuclear transport. This transient protein modification enables cells or tissues to adapt to nutrient conditions or stress. O-Glycosylation of the 26 S proteasome ATPase subunit Rpt2 is known to influence the stability of proteins by reducing their proteasome-dependent degradation. In contrast, knowledge of the sites of O-GlcNAcylation on the subunits of the catalytic core of the 26 S proteasome, the 20 S proteasome, and the impact on proteasome activity is very limited. This is predominantly because O-GlcNAc modifications are often substoichiometric and because 20 S proteasomes represent a complex protein mixture of different subtypes. Therefore, identification of O-GlcNAcylation sites on proteasome subunits essentially requires effective enrichment strategies. Here we describe an adapted β-elimination-based derivatization method of O-GlcNAc peptides using a novel biotin-cystamine tag. The specificity of the reaction was increased by differential isotopic labeling with either "light" biotin-cystamine or deuterated "heavy" biotin-cystamine. The enriched peptides we...Continue Reading

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Methods Mentioned

BETA
glycosylation
size exclusion chromatography
immunoprecipitation
affinity purification

Software Mentioned

Mascot
4000er Series Explorer
ClickiT®
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