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A tyrosine kinase assay using reverse-phase high-performance liquid chromatography

A D Cann1, I Wolf, R A Kohanski

  • 1Department of Biochemistry, Mount Sinai School of Medicine, New York, New York 10029, USA.

Analytical Biochemistry
|May 1, 1997
PubMed
Summary

Reverse-phase high-performance liquid chromatography (HPLC) offers precise peptide phosphorylation assays without radioisotopes. Optimizing reaction conditions by regular column washing and adjusting reagent concentrations improves peptide recovery and quantitation in protein kinase studies.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Reverse-phase HPLC is a precise method for assaying peptide phosphorylation by protein kinases.
  • Native peptides can be used, avoiding radioisotopes, but assay conditions can hinder recovery and quantitation.

Purpose of the Study:

  • To identify and resolve challenges in reverse-phase HPLC assays for peptide phosphorylation.
  • To optimize conditions for accurate quantitation of phospho- and apo-peptides.

Main Methods:

  • Investigated issues with peptide retention time variation and peak broadening during repeated injections.
  • Examined peptide stability under various reaction conditions, including dithiothreitol and manganese cofactors.
  • Implemented regular column washing and adjusted reagent concentrations (ATP, dithiothreitol) and metal cofactors (manganese vs. magnesium).

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Main Results:

  • Regular washing of the reverse-phase column effectively resolved issues with peptide retention time and peak width.
  • Minimizing dithiothreitol concentration or substituting magnesium for manganese stabilized peptides.
  • Optimized conditions allowed for a broader range of peptide and ATP concentrations.

Conclusions:

  • Reverse-phase HPLC is a viable, accurate method for routine peptide phosphorylation assays.
  • Addressing column contamination and peptide stability issues is crucial for reliable quantitation in protein tyrosine kinase assays.
  • Optimized HPLC methods enhance the utility of peptide phosphorylation assays in biochemical research.