Universal Access to Protease Chemiluminescent Probes through Solid-Phase Synthesis.

Area of Science:

• Chemical Biology
• Organic Synthesis
• Enzyme Assays

Background:

• Protease chemiluminescent probes offer high sensitivity for detecting proteolytic enzyme activity.
• Current solution-phase synthesis methods are complex, time-consuming, and limit probe diversity.

Purpose of the Study:

• To develop a general solid-phase synthetic approach for preparing chemiluminescent protease probes.
• To overcome the limitations of solution-phase synthesis for rapid probe generation with diverse substrate scopes.

Main Methods:

• Immobilization of a chemiluminescent enol-ether precursor onto a 2-chlorotrityl-chloride resin via an acrylic acid substituent.
• Stepwise peptide elongation using standard Fmoc solid-phase peptide synthesis.
• Cleavage from the resin and subsequent oxidation to yield the final chemiluminescent dioxetane protease probe.

Main Results:

• Successful solid-phase synthesis of chemiluminescent probes for aminopeptidase and cathepsin-B.
• Efficient synthesis of a complex six-amino-acid probe for prostate-specific antigen (PSA) detection.
• Demonstrated applicability of the methodology for creating diverse peptidyl substrates.

Conclusions:

• The developed solid-phase methodology provides a versatile and efficient route for synthesizing chemiluminescent protease probes.
• This approach facilitates the rapid preparation of probes with a wide range of peptidyl substrates.
• The methodology is expected to accelerate research in enzyme activity monitoring and diagnostics.