Single-Cell Quantification of Protein Degradation Rates by Time-Lapse Fluorescence Microscopy in Adherent Cell Culture

Overview

This protocol describes a method to determine protein half-lives in single living adherent cells, using pulse labeling and fluorescence time-lapse imaging of SNAP-tag fusion proteins. The approach allows for single-cell resolution, providing insights into the heterogeneity of protein half-lives within a cell population.

Key Study Components

Area of Science

• Cell Biology
• Fluorescence Microscopy
• Protein Dynamics

Background

• Cellular proteins undergo continuous synthesis and degradation.
• Protein half-lives are crucial for understanding cellular regulation.
• Traditional methods often provide population averages rather than single-cell data.
• SNAP-tags enable specific labeling of proteins for real-time imaging.

Purpose of Study

• To measure the half-life of proteins in living cells.
• To achieve single-cell resolution in protein turnover studies.
• To assess the variability of protein half-lives in cultured cells.

Methods Used

• Pulse labeling of proteins with SNAP-tags.
• Fluorescence time-lapse microscopy for imaging.
• Analysis of protein degradation rates in single cells.
• Application to various types of adherent cultured cells.

Main Results

• Demonstrated the feasibility of measuring protein half-lives in real-time.
• Provided insights into the heterogeneity of protein turnover.
• Showed that the method can be applied to different proteins and cell types.
• Validated the use of SNAP-tags for tracking protein dynamics.

Conclusions

• The SNAP-tag method is effective for studying protein half-lives in living cells.
• This approach enhances our understanding of protein dynamics at the single-cell level.
• Future studies can leverage this technique for various biological applications.

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