Plant MAP Kinases pp 47-63

Part of the Methods in Molecular Biology book series (MIMB, volume 1171)

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Affinity-Based SDS PAGE Identification of Phosphorylated Arabidopsis MAPKs and Substrates by Acrylamide Pendant Phos-Tag™

  • George Komis
  • Tomáš Takáč
  • Slávka Bekešová
  • Pavol Vadovič
  • Jozef Šamaj

Abstract

Protein phosphorylation is the most abundant and best studied protein posttranslational modification, dedicated to the regulation of protein function and subcellular localization as well as to protein–protein interactions. Identification and quantitation of the dynamic, conditional protein phosphorylation can be achieved by either metabolic labeling of the protein of interest with 32P-labeled ATP followed by autoradiographic analysis, the use of specific monoclonal or polyclonal antibodies against the phosphorylated protein species and finally by phosphoproteome delineation using mass spectrometry.

Hereby we present a fourth alternative which relies on the enforced—affinity-based—electrophoretic separation of phosphorylated from non-phosphorylated protein species by standard SDS-PAGE systems co-polymerized with Phos-Tag™ and Mn2+ or Zn2+ cations. Phosphate groups of phosphorylated Ser, Thr, and Tyr residues form complexes with Mn2+ and Zn2+ cations with polyacrylamide immobilized Phos-Tag™. Following appropriate treatment of the gels, separated proteins can be quantitatively transferred to PVDF or nitrocellulose membranes and probed with common—not phosphorylation state specific—antibodies and delineate the occurrence of a certain phosphoprotein species against its non-phosphorylated counterpart.

Key words

Mitogen-activated protein kinase Lambda phosphatase Phos-Tag™ Sodium dodecyl sulfate–polyacrylamide gel electrophoresis 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • George Komis
    • 1
  • Tomáš Takáč
    • 1
  • Slávka Bekešová
    • 1
  • Pavol Vadovič
    • 1
  • Jozef Šamaj
    • 1
  1. 1.Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of SciencePalacký University OlomoucOlomoucCzech Republic

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