Activity-based probes for monitoring postproline protease activity

Area of Science:

• Biochemistry and Molecular Biology
• Enzymology
• Protease Research

Background:

• Postproline proteases, a class of serine proteases, play critical roles in cellular signaling.
• These proteases are implicated in diseases such as diabetes and cancer, highlighting their therapeutic potential.
• Understanding the activity of postproline proteases in various physiological states is crucial for identifying new therapeutic targets.

Purpose of the Study:

• To synthesize a novel activity-based probe (ABP) for selective detection of postproline protease activity.
• To evaluate the probe's sensitivity and selectivity for prolyl oligopeptidase (POP).
• To explore the utility of the probe in activity-based protein profiling (ABPP) and protease identification.

Main Methods:

• Synthesis of a dipeptidyl phosphonate-based activity-based probe.
• In-gel activity-based analysis to detect POP activity.
• Mass spectrometry-based analysis to confirm probe selectivity and identify substrates.

Main Results:

• A highly selective dipeptidyl phosphonate probe for prolyl oligopeptidase (POP) was successfully synthesized.
• The probe demonstrated high sensitivity, enabling the detection of endogenous POP activity.
• Mass spectrometry confirmed the probe's specificity, supporting its application in activity-based profiling.

Conclusions:

• The developed dipeptidyl phosphonate probe is a sensitive and selective tool for monitoring POP activity.
• This probe facilitates the study of POP's physiological roles in health and disease.
• The findings open avenues for using dipeptidyl phosphonates in advanced activity-based protein profiling and protease identification strategies.