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Papain-like auto-proteinase The replicase polyproteins of the Nidoviruses such as, porcine arterivirus PRRSV, equine arterivirus EAV, human coronavirus 229E, and severe acute respiratory syndrome coronavirus (SARS-CoV), are predicted to be cleaved into 14 non-structural proteins (nsps) by the nsp4 main proteinase pfam05579 and three accessory proteinases residing in nsp1-alpha, nsp1-beta and nsp2. This family is the two nsp1 proteins that together act in a papain-like way to separate off the rest of the various functional domains of the polyprotein. Once inside the host cell, this nsp1 interferes with the regulation of interferon, thereby enabling the virus to replicate. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",