Plays a role in the inhibition of host innate immunity by inhibiting the interaction between host IKBKE and MAVS. In turn, this inhibition prevents the production of host interferon beta. Additionally, inhibits host NF-kappa-B by interacting with host KPNA4 and thereby preventing the translocation of the NF-kappa-B complex into the nucleus by this importin (PubMed:29370303). Interacts with host KPNA4; this interaction inhibits the nuclear import of NF-kappa-B complex. Mainly localized in the host nucleus.