pfam14901: Jiv90 (This model is not part of the current CDD release)
Cleavage inducing molecular chaperone
Jiv90 is a fragment of the DnaJ protein in eukaryotes and in J-domain protein interacting with viral protein (Jiv) located in the N terminal region of the pestivirus viral polypeptide. The viral protein interacts stably with non structural (NS) protein NS2, causing a conformational change in NS2-NS3 and stimulates NS2-NS3 cleavage in trans. Cleavage of NS2-NS3 increases cytopathogenicity and consequently aids viral replication. Jiv therefore acts as a regulating cofactor for NS2 auto-protease. The efficient release of NS3 from the viral polypeptide by Jiv is considered crucial to the pestivirus cytopathogenicity. In eukaryotes, it usually lies 40 residues downstream of DnaJ family pfam00226. However, the function in eukaryotes is still unknown.
Jiyao W et al.(2023). "The conserved domain database in 2023.",