Proteolytic fingerprinting of complex biological samples using combinatorial libraries of fluorogenic probes

Area of Science:

• Biochemistry
• Proteomics
• Molecular Biology

Background:

• Proteases are implicated as biomarkers and therapeutic targets in various human diseases.
• Characterizing disease-relevant proteases in complex biological fluids like serum and plasma presents a significant challenge due to the presence of numerous hydrolases.
• Understanding protease activity is crucial for disease diagnosis and treatment development.

Purpose of the Study:

• To develop and describe a protocol for mapping the global proteolytic substrate specificities within complex biological samples.
• To enable a quantitative and comparative analysis of protease activities between different biological samples.
• To identify disease-specific proteolytic 'fingerprints' for potential diagnostic and therapeutic applications.

Main Methods:

• Utilizing a concise combinatorial library of internally quenched fluorogenic peptide probes (IQFPs).
• Applying a substrate profiling approach to analyze protease specificities.
• Comparing proteolytic activities across diverse biological samples.

Main Results:

• The developed protocol successfully maps global proteolytic substrate specificities.
• The method allows for quantitative comparisons of protease activities between samples.
• Demonstrated potential for identifying disease-specific protease activity patterns.

Conclusions:

• The IQFP-based substrate profiling offers a powerful tool for analyzing protease activity in complex biological systems.
• This approach facilitates the discovery of disease-specific protease signatures.
• The findings support the utility of protease profiling in disease diagnosis and therapeutic strategies.