| Protein description |
ORF1 encodes six non-structural (NS) proteins involved in viral replication, which are: N-Term (NS1/2), NTPase (NS3), 3C-like (NS4), VPg (NS5), Protease (NS6), and RNA-dependent RNA polymerase (RdRp; NS7). Protein p48 may play a role in viral replication by interacting with host VAPA, a vesicle-associated membrane protein that plays a role in SNARE-mediated vesicle fusion. This interaction may target replication complex to intracellular membranes. NTPase presumably plays a role in replication. Despite having similarities with helicases, does not seem to display any helicase activity. Protein P22 may play a role in targeting replication complex to intracellular membranes. Viral genome-linked protein is covalently linked to the 5'-end of the positive-strand, negative-strand genomic RNAs and subgenomic RNA. Acts as a genome-linked replication primer. May recruit ribosome to viral RNA thereby promoting viral proteins translation. 3C-like protease processes the polyprotein: 3CLpro-RdRp is first released by autocleavage, then all other proteins are cleaved. May cleave host polyadenylate-binding protein thereby inhibiting cellular translation.
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