Site-Specific GlcNAcylation of Human Erythrocyte Proteins
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O-GlcNAc as potential biomarkers for diabetes. Specific O-GlcNAc sites (underlined Ser) on ankyrin-1 (identified and quantified
by QSTAR) and catalase (identified by LTQ-Orbitrap) were upregulated 2.7- and 3.9-fold, respectively. A: Extracted ion chromatogram (XIC). B: Averaged full-scan spectra during elution time of the ion pairs. C: MS/MS spectra that showed the peptide sequences and mapped DTT attachment sites.