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. 2019 Nov 18;13(11):e0007894. doi: 10.1371/journal.pntd.0007894

Table 1. Inhibition of the RdRp activity by RK-0404678 for the full-length DENV1-4 NS5 proteins (determined as IC50) and inhibition of the viral replication of DENV1-4 by RK-0404678 (determined as EC50).

DENV1 DENV2 DENV3 DENV4
IC50 (μM)
Polymerase assay
46.2 ± 2.8 201 ± 4.9 287 ± 11 445 ± 23
EC50 (μM)
Cell-based assay
29.5 ± 4.2 6.0 ± 0.30 29.4 ± 1.8 31.9 ± 2.8

The results shown are the mean and standard deviation of quadruplicate measurements for IC50 values in a single experiment and triplicate measurements for EC50 values. For EC50 values, one representative result of three independent experiments is shown. The IC50 and EC50 values were compared by Extra Sum-of-Squares F test in PRISM version 6 (GraphPad Software, Inc.). The p-values for differences in IC50 values were p < 0.0001 for all combinations of the four serotypes. The p-values for differences in EC50 values are as follows: p < 0.0001 for DENV1–DENV2, DENV2–DENV3, and DENV2–DENV4; p = 0.135 for DENV1–DENV3; p = 0.131 for DENV1–DENV4; p = 0.294 for DENV3–DENV4.