MHV-68 and KSHV ORF54 diminish IFN-α induced activation of ISRE in a non-dUTPase related manner.

HEK 293T cells were transiently transfected with ISRE_firefly-luciferase, PGK_renilla-luciferase as an internal control, and with expression plasmids for each ORF, control plasmid, or murine cellular dUTPase, then were treated with 3×10⁴ U/mL of human IFN-α. Firefly luciferase values were normalized to renilla luciferase. Percentage of activation is calculated in comparison to control, an unrelated MHV-68 ORF or vector control. Error bars depict one standard error based on four independent trials.