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. 2021 Oct 15;49:315–354. doi: 10.1016/bs.enz.2021.07.002

Fig. 11.

Fig. 11

Mechanism of inhibition of the influenza RdRp by favipiravir. (A) Base pairing of the keto and enol forms of favipiravir with CMP and UMP. (B) Two consecutive incorporations of favipiravir leads to chain termination, preventing successful polymerase activity. X, G or A nucleotides; N, any nucleotide; F, favipiravir.

Panel (A): Adapted from N.R. Jena, Role of different tautomers in the base-pairing abilities of some of the vital antiviral drugs used against COVID-19, Phys. Chem. Chem. Phys. 22 (48) (2020) 28115–28122. Panel (B): Mechanism adapted from Z. Jin, et al., The ambiguous base-pairing and high substrate efficiency of T-705 (favipiravir) ribofuranosyl 5'-triphosphate towards influenza A virus polymerase, PLoS One 8 (7) (2013) e68347.