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Analysis of Protein Glycosylation and Phosphorylation Using Liquid Phase Separation, Protein Microarray Technology, and Mass Spectrometry

  • Jia Zhao
  • Tasneem H. Patwa
  • Manoj Pal
  • Weilian Qiu
  • David M. Lubman
Part of the Methods In Molecular Biology book series (MIMB, volume 492)

Summary

Protein glycosylation and phosphorylation are very common posttranslational modifications. The alteration of these modifications in cancer cells is closely related to the onset and progression of cancer and other disease states. In this protocol, strategies for monitoring the changes in protein glycosylation and phosphorylation in serum or tissue cells on a global scale and specifically characterizing these alterations are included. The technique is based on lectin affinity enrichment for glycoproteins, all liquid-phase two-dimensional fractionation, protein microarray, and mass spectrometry technology. Proteins are separated based on pI in the first dimension using chromatofocusing (CF) or liquid isoelectric focusing (IEF) followed by the second-dimension separation using nonporous silica RP-HPLC. Five lectins with different binding specificities to glycan structures are used for screening glycosylation patterns in human serum through a biotin streptavidin system. Fluorescent phosphodyes and phosphospecific antibodies are employed to detect specific phosphorylated proteins in cell lines or human tissues. The purified proteins of interest are identified by peptide sequencing. Their modifications including glycosylation and phosphorylation could be further characterized by mass-spectrometry-based approaches. These strategies can be used in biological samples for large-scale glycoproteome/phosphoproteome screening as well as for individual protein modification analysis.

Key words

Glycosylation Phosphorylation Posttranslational modification Protein microarrays Liquid phase separation Lectin Mass spectrometry 

Notes

Acknowledgments

This work was supported in part by the National Cancer Institute under grant R01CA106402 (D.M.L.), the National Institute of Health under grant R01GM49500 (D.M.L.), and a Michigan Economic Development Grant MEDC03–622 (D.M.S.). Support was also generously provided by Eprogen, Inc. and Beck-man-Coulter. We thank Bio-Rad for the gift of the micro-Rotofor device.

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Copyright information

© Humana Press, a part of Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Jia Zhao
    • 1
  • Tasneem H. Patwa
    • 1
  • Manoj Pal
    • 1
  • Weilian Qiu
    • 1
  • David M. Lubman
    • 2
  1. 1.Department of ChemistryUniversity of Michigan Medical CenterAnn ArborUSA
  2. 2.Department of Chemistry, Comprehensive Cancer CenterDepartment of Surgery, University of Michigan Medical CenterAnn ArborUSA

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