Analysis of protein turnover by quantitative SNAP-based pulse-chase imaging

Area of Science:

• Cellular biology
• Biochemistry
• Molecular imaging

Background:

• Understanding protein dynamics is essential for cell biology.
• The SNAP-tag enzyme offers unique capabilities for live-cell protein analysis.
• Existing methods for protein turnover assessment can be limited.

Purpose of the Study:

• To provide detailed protocols for utilizing the SNAP-tag system in live-cell protein dynamics studies.
• To establish fluorescent pulse-chase and quench-chase-pulse experiments for quantifying protein fate and turnover.
• To evaluate the SNAPf variant and present an automated analysis algorithm.

Main Methods:

• Development and application of SNAP-tag based fluorescent pulse-chase and quench-chase-pulse assays.
• Live-cell imaging and time-slicing experiments to monitor protein dynamics.
• Evaluation of the SNAPf variant for enhanced labeling kinetics.
• Implementation of an automated algorithm for protein spot recognition and quantification.

Main Results:

• Detailed protocols for SNAP-tag based protein dynamics studies are presented.
• Fluorescent pulse-chase and quench-chase-pulse methods effectively quantify protein turnover rates.
• The SNAPf variant shows promise for fast-acting labeling in live cells.
• An automated algorithm facilitates the analysis of protein turnover data.

Conclusions:

• The SNAP-tag system, particularly with the SNAPf variant, provides a robust platform for assessing protein dynamics and turnover in living cells.
• The developed time-slicing methods and automated analysis offer powerful tools for quantitative biological research.
• These protocols advance the ability to study protein fate and function in real-time cellular environments.