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Related Experiment Videos

Assaying protein kinase activity.

Jan Brábek1, Steven K Hanks

  • 1Department of Cell and Developmental Biology, Vanderbuilt University School of Medicine, Nashville, TN, USA.

Methods in Molecular Biology (Clifton, N.J.)
|June 3, 2004
PubMed
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This study details methods for measuring protein kinase activity, focusing on the oncogenic protein-tyrosine kinase v-Src. Protocols cover expression, purification, and activity assays, crucial for understanding cell signaling pathways.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Protein kinases regulate crucial cellular functions and are encoded by approximately 2% of eukaryotic genes.
  • Assessing protein kinase catalytic activity is vital for elucidating signal-transduction pathways.
  • The oncogenic protein-tyrosine kinase v-Src serves as a model for studying kinase activity.

Purpose of the Study:

  • To present methods for determining the activity of the protein-tyrosine kinase v-Src.
  • To provide protocols for heterologous expression, purification, and kinase assays.
  • To offer guidance on assaying other protein kinases, considering substrate specificity and buffer conditions.

Main Methods:

  • Heterologous expression of v-Src in yeast (Saccharomyces cerevisiae).

Related Experiment Videos

  • Immunoaffinity purification of v-Src from yeast cell lysates.
  • Kinase reactions involving 32P incorporation into peptide substrates and activity quantification.
  • Main Results:

    • Established protocols for the expression and purification of active v-Src in yeast.
    • Demonstrated methods for quantifying protein kinase activity using radiolabeled substrates.
    • Provided a framework for adapting these methods to other protein kinases.

    Conclusions:

    • The presented methods enable robust assessment of protein kinase activity, exemplified by v-Src.
    • Accurate measurement of kinase activity is essential for dissecting complex cell signaling networks.
    • Recommendations are provided for optimizing kinase assays based on enzyme and substrate characteristics.