| Assay Method Information | |
| | FRET-Based PLpro Enzymatic Assay |
| Description: | The SARS-CoV-2 PLpro enzymnatic assays were carried out as follows: The assay was assembled in 96-well plates with 100 μl of 200 nM PLpro protein in PLpro reaction buffer [50 mM Hepes (pH 7.5), 0.01% Triton X-100, and 5 mM DTT], Then, 1 μL of testing compound at various concentrations was added to each well and incubated a 30° C. for 30 minutes. The enzymatic reaction was initiated by adding 1 μl of 1 mM FRET substrate (the final substrate concentration is 10 μM). The reaction was monitored in a Cytation 5 image reader with filters for excitation at 360/40 nm and emission at 460/40 nm at 30° C. for 1 hour. The initial velocity of the enzymatic reaction with and without testing compounds was calculated by linear regression for the first 15 minutes of the kinetic progress curve. The IC50 values were calculated by plotting the initial velocity against various concentrations of testing compounds with a dose-response function in Prism 8 software (Table 2). |
| Affinity data for this assay | |
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