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Determination of specific protein kinase activities using phosphorus-33
1Department of Hematology, University Hospital Utrecht, Netherlands.
Journal of Biochemical and Biophysical Methods
|January 11, 1996
Summary
This study introduces phosphorus-33 (33P) for protein kinase assays, enabling precise measurement of enzyme activity and amount simultaneously. This improved method enhances the detection of kinase activation by cytokines and growth factors.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- The immune complex kinase assay is standard for assessing protein tyrosine kinase activity.
- Current methods allow enzyme activity determination and normalization but require parallel experiments.
- Variations between samples can affect the precision of kinase activity measurements.
Purpose of the Study:
- To describe a novel application of phosphorus-33 (33P) in protein kinase assays.
- To enable simultaneous measurement of kinase activity and enzyme amount in a single sample.
- To improve the precision and reliability of kinase activity assessments.
Main Methods:
- Utilizing the low-energy isotope 33P for the protein kinase assay.
- Employing 125I-labeled antibodies for simultaneous detection of enzyme amount.
- Analyzing a single sample for both catalytic activity and protein quantity.
Main Results:
- The use of 33P allows for concurrent assessment of kinase activity and enzyme levels.
- This integrated approach minimizes variations inherent in parallel sample processing.
- Specific kinase activities can be calculated with significantly higher precision.
Conclusions:
- The described method offers a more precise way to measure protein kinase activity.
- It is particularly valuable for studying cytokine and growth factor-induced kinase activation.
- The assay effectively distinguishes changes in enzyme activity from alterations in enzyme levels due to relocalization.