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Mol Cell Proteomics. 2008 Jul;7(7):1389-96. doi: 10.1074/mcp.M700468-MCP200. Epub 2008 Apr 11.

A multidimensional chromatography technology for in-depth phosphoproteome analysis.

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  • 1Ludwig Institute for Cancer Research, Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA.

Abstract

Protein phosphorylation is a post-translational modification widely used to regulate cellular responses. Recent studies showed that global phosphorylation analysis could be used to study signaling pathways and to identify targets of protein kinases in cells. A key objective of global phosphorylation analysis is to obtain an in-depth mapping of low abundance protein phosphorylation in cells; this necessitates the use of suitable separation techniques because of the complexity of the phosphoproteome. Here we developed a multidimensional chromatography technology, combining IMAC, hydrophilic interaction chromatography, and reverse phase LC, for phosphopeptide purification and fractionation. Its application to the yeast Saccharomyces cerevisiae after DNA damage led to the identification of 8764 unique phosphopeptides from 2278 phosphoproteins using tandem MS. Analysis of two low abundance proteins, Rad9 and Mrc1, revealed that approximately 50% of their phosphorylation was identified via this global phosphorylation analysis. Thus, this technology is suited for in-depth phosphoproteome studies.

PMID:
18407956
[PubMed - indexed for MEDLINE]
PMCID:
PMC2493382
Free PMC Article

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