Fig 2. Polymerase activity of polymerase gene segments carrying PB1 E177G, A652T and NP I119M and in vitro replication kinetics of viruses with these PB1 and NP substituations.
Activity of polymerase complexes carrying PB1 and NP substitutions in HEK-293T, A549, and SH-SY5Y cells (A). Polymerase activity is presented relative to that of H5N1-WT. Dotted lines indicate polymerase activity at H5N1-WT level and 2-fold increased activity. Mutant PB1 or NP genes that have significantly different polymerase or replicative (B) activity from that of H5N1-WT. Signifancies are indicated by asterisks, identified using a one-way (A) analysis of variance (ANOVA) with Bonferroni’s multiple-comparison tests or a two-way (B) analysis of variance (ANOVA) with Dunnett’s multiple-comparison tests. *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001; ****, P ≤ 0.0001. Data are presented as means ±SEMs for panels A and ±SDs for panels B from at least three independent experiments.