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Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase
Published on: February 12, 2019
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Pulse-chase analysis to measure protein degradation
Einav Simon1, Daniel Kornitzer1
1Faculty of Medicine, Technion - I.I.T. and Rappaport Institute for Biomedical Research, Haifa, Israel.
Methods in Enzymology
|January 16, 2014
Summary
Pulse-chase analysis measures protein half-life by tracking labeled proteins. Cells are briefly exposed to radioactive isotopes, then non-radioactive isotopes, to observe protein decay over time.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Protein stability is crucial for cellular function.
- Understanding protein degradation rates informs disease mechanisms.
Purpose of the Study:
- To describe the methodology of pulse-chase analysis for measuring protein half-life.
- To provide a foundational understanding of protein turnover studies.
Main Methods:
- Cells are incubated with radiolabeled precursors (e.g., 35S-methionine, 35S-cysteine) for a short pulse period.
- The labeled compound is removed, and cells are incubated with excess unlabeled (cold) precursor during the chase period.
- The amount of radioactivity in proteins is measured over time to determine the rate of decay.
Main Results:
- The technique allows for the quantification of protein degradation rates.
- Changes in protein half-life can be observed under various experimental conditions.
Conclusions:
- Pulse-chase analysis is a robust method for assessing protein stability and turnover.
- This technique is essential for studying protein dynamics in biological systems.
