SensoLyte® SARS-CoV-2 3CL Protease Activity Assay Kit *Fluorimetric*

Check your price
  • Cat.Number : AS-72262
  • Availability :
    In stock
  • Shipping conditions : Ice fees will apply


The SensoLyte® 520 SARS-CoV-2 3CL Protease Activity Assay Kit employs a fluorescence FRET peptide substrate for the detection of enzyme activity. The sequence of this substrate is based on the site-specific cleavage sequence for coronavirus 3CLpro enzymes. When active 3CL Protease cleaves the FRET substrate, it results in an increase of HiLyte Fluor™ 488 green fluorescence monitored at excitation/emission = 490 nm/520 nm. With superior fluorescence quantum yield and longer emission wavelength, the HiLyte™ Fluor 488/QXL® 520 based FRET peptide has less interference from the autofluorescence of test compounds and cellular components and provides better assay sensitivity. This assay can detect as low as 15.6 ng/mL active 3CL protease in the sample. This kit can be used to detect enzyme activity in purified enzyme preparations, biological samples and can also be applied for the compound screening.

SARS-CoV-2 3-chymotrypsin-like protease (3CL protease, also called the main protease) is essential for processing the polyproteins that are translated from the viral RNA. It is involved in the transcription and replication during the viral infection. 3CL protease cleaves the replicase 1ab at least 11 cleavage sites producing proteins that are assembled into the virion. The advantage of choosing 3CL protease as the SARS-CoV-2 virus drug target is that the protein structure is well conserved across the Coronaviridae family.


Kits components
  • Component A: Hilyte™ Fluor-488/QXL® 520 3CL Protease substrate, Ex/Em=490 nm/520 nm upon cleavage; 1mM, 50µL Component B: Hilyte™ Fluor-488 fluorescence reference standard, Ex/Em=490 nm/520 nm; 1mM, 10µL Component C: Recombinant SARS-CoV-2 3CL Protease; 0.1mg/mL, 50µL Component D: 2X Assay Buffer, 20mL Component E: Inhibitor (GC 376); 10µM, 10µL
Absorbance (nm)
  • 490
Emission (nm)
  • 520
Conjugation type
  • Double dyes
Modification Name
Storage & stability
Storage Conditions
  • Store component C at -80°C. Store all other components at -20°C. Protect components A and B from light and moisture.
Biomarker Target
Detection Method
Detection Limit
  • 15.6 ng/ml
Research Area
  • Research use

You may also be interested in the following product(s)