Fluorescence-based proteasome activity profiling
Annemieke de Jong1, Karianne G Schuurman, Boris Rodenko
1Division of Cell Biology II, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Abstract:
With the proteasome emerging as a therapeutic target for cancer treatment, accurate tools for monitoring proteasome (inhibitor) activity are in demand. In this chapter, we describe the synthesis and use of a fluorescent proteasome activity probe that allows for accurate profiling of proteasomal activity in cell lysates, intact cells, and murine and human patient-derived material, with high sensitivity using SDS-PAGE. The probe allows for direct scanning of the gel for fluorescent emission of the distinct proteasomal subunits and circumvents the use of Western blot analysis. Due to its suitable biochemical and biophysical properties, the fluorescent probe can also be used for confocal laser scanning microscopy and flow cytometry-based experiments.
Insights
A new fluorescent probe enables sensitive detection of proteasome activity in various biological samples. This tool aids in monitoring proteasome inhibitor efficacy for cancer therapy.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Therapeutics
Background:
- The proteasome is a key therapeutic target in cancer treatment.
- Accurate monitoring of proteasome activity and inhibitor efficacy is crucial.
- Existing methods for proteasome activity profiling can be labor-intensive.
Purpose of the Study:
- To develop and validate a novel fluorescent probe for proteasome activity.
- To enable sensitive and direct profiling of proteasomal activity.
- To provide a versatile tool for various biological sample types and experimental setups.
Main Methods:
- Synthesis of a novel fluorescent proteasome activity probe.
- Application of the probe for activity profiling in cell lysates, intact cells, and patient-derived materials.
- Analysis using SDS-PAGE, confocal laser scanning microscopy, and flow cytometry.
Main Results:
- The fluorescent probe allows for high-sensitivity detection of proteasomal activity.
- Direct scanning of SDS-PAGE gels for fluorescent emission of proteasomal subunits is feasible, bypassing Western blot analysis.
- The probe demonstrates suitability for microscopy and flow cytometry applications.
Conclusions:
- The developed fluorescent probe is a sensitive and versatile tool for monitoring proteasome activity.
- This probe facilitates accurate profiling of proteasome (inhibitor) activity in diverse biological contexts.
- It offers a streamlined alternative to conventional methods for proteasome activity assessment in cancer research.
