
doi: 10.1021/pr7006335
pmid: 18257517
Phosphorylation is a key regulator of many events in eukaryotic cells. The acquisition of large-scale phosphorylation data sets from model organisms can pinpoint conserved regulatory inputs and reveal kinase-substrate relationships. Here, we provide the first large-scale phosphorylation analysis of the fission yeast, Schizosaccharomyces pombe. Protein from thiabendazole-treated cells was separated by preparative SDS-PAGE and digested with trypsin. The resulting peptides were subjected to either IMAC or TiO2 phosphopeptide enrichment methods and then analyzed by LC-MS/MS using an LTQ-Orbitrap mass spectrometer. In total, 2887 distinct phosphorylation sites were identified from 1194 proteins with an estimated false-discovery rate of <0.5% at the peptide level. A comparison of the two different enrichment methods is presented, supporting the finding that they are complementary. Finally, phosphorylation sites were examined for phosphorylation-specific motifs and evolutionary conservation. These analyses revealed both motifs and specific phosphorylation events identified in S. pombe were conserved and predicted novel phosphorylation in mammals.
Fungal Proteins, Proteome, Tandem Mass Spectrometry, Schizosaccharomyces, Electrophoresis, Polyacrylamide Gel, Phosphorylation, Phosphoproteins, Chromatography, Liquid
Fungal Proteins, Proteome, Tandem Mass Spectrometry, Schizosaccharomyces, Electrophoresis, Polyacrylamide Gel, Phosphorylation, Phosphoproteins, Chromatography, Liquid
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