Related Experiment Video
Updated: May 29, 2026
Use of Recombinant Fusion Proteins in a Fluorescent Protease Assay Platform and Their In-gel Renaturation
Published on: January 16, 2019
Highly adaptable and sensitive protease assay based on fluorescence resonance energy transfer
Thomas Zauner1, Renate Berger-Hoffmann, Katrin Müller
1Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Center for Biotechnology and Biomedicine, Leipzig University, Deutscher Platz 5, 04103 Leipzig, Germany.
A new protease fluorescence resonance energy transfer (pro-FRET) assay offers sensitive and specific detection of proteolytic enzymes in complex mixtures. This adaptable assay provides a versatile tool for monitoring protease activity in analytical sciences and disease research.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Molecular Biology
Background:
- Proteases are crucial in analytical sciences and disease pathogenesis.
- Sensitive and adaptable assays are needed for detecting proteolytic enzymes.
- Existing methods may lack the required sensitivity or specificity.
Purpose of the Study:
- To develop a simple, sensitive, and adaptable protease fluorescence resonance energy transfer (pro-FRET) assay.
- To demonstrate the assay's utility for detecting proteases in complex biological mixtures.
- To establish a versatile tool for protease activity monitoring.
Main Methods:
- Development of a pro-FRET assay utilizing a FRET peptide substrate.
- Demonstration using trypsin and enteropeptidase in Escherichia coli lysate.
- Application of an enzyme cascade for signal amplification (enteropeptidase).
Main Results:
- The pro-FRET assay showed high sensitivity and speed for trypsin and enteropeptidase.
- Detection limits were as low as 100 amol for trypsin and 10 amol for enteropeptidase.
- The assay demonstrated high specificity, with minimal background signal from other proteases.
Conclusions:
- The pro-FRET assay is a sensitive, specific, and simple method for protease detection.
- The assay is effective in complex biological mixtures.
- It serves as a versatile tool for monitoring protease activity.
