Genome polyprotein

UniProtKB accession:  P03305

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UniProtKB description:  Autocatalytically cleaves itself from the polyprotein at the L/VP0 junction. Also cleaves the host translation initiation factors EIF4G1 and EIF4G3, in order to shut off the capped cellular mRNA transcription. Plays a role in counteracting host innate antiviral response using diverse mechanisms. Possesses a deubiquitinase activity acting on both 'Lys-48' and 'Lys-63'-linked polyubiquitin chains. In turn, inhibits the ubiquitination and subsequent activation of key signaling molecules of type I IFN response such as host RIGI, TBK1, TRAF3 and TRAF6. Inhibits host NF-kappa-B activity by inducing a decrease in RELA mRNA levels. Cleaves a peptide bond in the C-terminus of host ISG15, resulting in the damaging of this modifier that can no longer be attached to target proteins (PubMed:29463763). Also cleaves host G3BP1 and G3BP2 in order to inhibit cytoplasmic stress granules assembly.