A Non-Peptidic Fluorescent Probe for In Vitro Detection of Chymotrypsin

Area of Science:

• Biochemistry
• Chemical Biology
• Molecular Probes

Background:

• Traditional peptide-based probes for enzyme detection often face issues with stability and degradation.
• Developing robust and sensitive probes is crucial for accurate enzymatic assays in biological systems.

Purpose of the Study:

• To develop a novel non-peptide fluorescent probe, NQ, for the sensitive and rapid detection of chymotrypsin (Chy).
• To enhance probe stability and minimize background interference in complex biological environments.

Main Methods:

• Design and synthesis of a non-peptide fluorescent probe (NQ) utilizing a hydrocinnamoyl chloride recognition group.
• In vitro evaluation of NQ's response to chymotrypsin, including response time, detection limit, and stability.
• Assessment of probe performance in HepG2 cell models.

Main Results:

• The NQ probe demonstrated a turn-on fluorescence signal upon cleavage by chymotrypsin, releasing NQOH.
• Achieved a rapid initial response within 10 minutes and a low detection limit of 7.64 ng/mL.
• The probe exhibited a large Stokes shift (177nm) and stability in complex biological environments, validated in HepG2 cells.

Conclusions:

• The non-peptide NQ probe offers a stable, sensitive, and rapid method for chymotrypsin detection.
• The probe's design overcomes limitations of peptide-based probes, improving accuracy in biological samples.
• NQ is suitable for biological applications, highlighting the potential of non-peptide designs for enzyme detection.