UniProtKB/Swiss-Prot entry Q89277

• FUNCTION: Protein C packages viral RNA to form a viral nucleocapsid, and promotes virion budding (By similarity).
• FUNCTION: prM acts as a chaperone for envelope protein E during intracellular virion assembly by masking and inactivating envelope protein E fusion peptide. prM is matured in the last step of virion assembly, presumably to avoid catastrophic activation of the viral fusion peptide induced by the acidic pH of the trans-Golgi network. After cleavage by host furin, the pr peptide is released in the extracellular medium and small envelope protein M and envelope protein E heterodimers are dissociated (By similarity).
• FUNCTION: Envelope protein E binds cell surface receptor and is involved in membrane fusion between virion and target cell. Synthesized as an homodimer with prM which acts as a chaperone for envelope protein E. After cleavage of prM, envelope protein E dissociate from small envelope protein M and homodimerizes (By similarity).
• FUNCTION: Non-structural protein 1 is slowly secreted from mammalian cells, but not from mosquito cells. The secreted form elicits protective immune response and plays an essential role in RNA replication (By similarity).
• FUNCTION: Non-structural protein 2B is a required cofactor for the serine protease function of NS3 (By similarity).
• FUNCTION: Serine protease NS3 displays three enzymatic activities: serine protease, NTPase and RNA helicase. NS3 serine protease, in association with NS2B, cleaves the polyprotein at dibasic sites in the cytoplasm: C-prM, NS2A-NS2B, NS2B-NS3, NS3-NS4A, NS4A-2K and NS4B-NS5. NS3 RNA helicase binds RNA and unwinds dsRNA in the 3' to 5' direction (By similarity).
• FUNCTION: Non-structural protein 4A plays a role in RNA replication (By similarity).
• FUNCTION: Non-structural protein 4B plays a role in RNA replication (By similarity).
• FUNCTION: RNA-directed RNA polymerase NS5 replicates the viral (+) and (-) genome, and assure the capping of genomes in the cytoplasm. May be involved in methylation of 5'RNA cap structure (By similarity).
• CATALYTIC ACTIVITY: Selective hydrolysis of -Xaa-Xaa-|-Yaa- bonds in which each of the Xaa can be either Arg or Lys and Yaa can be either Ser or Ala.
• CATALYTIC ACTIVITY: Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1).
• CATALYTIC ACTIVITY: S-adenosyl-L-methionine + G(5')pppR-RNA = S-adenosyl-L-homocysteine + m₇G(5')pppR-RNA.
• SUBUNIT: prM and envelope protein E form heterodimers in the endoplasmic reticulum and Golgi. Envelope protein E forms homodimers. NS1 forms homodimers as well as homohexamers when secreted. NS1 may interact with NS4A. NS3 and NS2B form an heterodimer. NS3 interacts with unphosphorylated NS5 (By similarity).
• SUBCELLULAR LOCATION: Protein C: Virion (By similarity).
• SUBCELLULAR LOCATION: Peptide pr: Secreted (By similarity).
• SUBCELLULAR LOCATION: Small envelope protein M: Virion membrane; Single-pass type I membrane protein (By similarity).
• SUBCELLULAR LOCATION: Envelope protein E: Virion membrane; Single-pass type I membrane protein (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 1: Secreted. Endoplasmic reticulum membrane; Peripheral membrane protein; Lumenal side (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 2A-alpha: Endoplasmic reticulum membrane (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 2A: Endoplasmic reticulum membrane (By similarity).
• SUBCELLULAR LOCATION: Serine protease subunit NS2B: Endoplasmic reticulum membrane; Peripheral membrane protein; Cytoplasmic side (By similarity).
• SUBCELLULAR LOCATION: Serine protease subunit NS3: Endoplasmic reticulum membrane; Peripheral membrane protein; Cytoplasmic side (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 4A: Endoplasmic reticulum membrane; Peripheral membrane protein; Cytoplasmic side (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 4B: Endoplasmic reticulum membrane; Multi-pass membrane protein (By similarity). Note=The C-terminal transmembrane domain of non-structural protein 4B is presumably reoriented after cleavage on the lumenal side (By similarity).
• SUBCELLULAR LOCATION: RNA-directed RNA polymerase NS5: Endoplasmic reticulum membrane; Peripheral membrane protein; Cytoplasmic side. Nucleus (By similarity).
• DOMAIN: Transmembrane domains of the small envelope protein M and envelope protein E contains an endoplasmic reticulum retention signals (By similarity).
• PTM: Specific enzymatic cleavages in vivo yield mature proteins. The nascent protein C contains a C-terminal hydrophobic domain that act as a signal sequence for translocation of prM into the lumen of the ER. Mature protein C is cleaved at a site upstream of this hydrophobic domain by NS3. prM is cleaved in post-Golgi vesicles by a host furin, releasing the mature small envelope protein M, and peptide pr. Non-structural protein 2A-alpha, a C-terminally truncated form of non-structural protein 2A, results from partial cleavage by NS3 (By similarity).
• PTM: RNA-directed RNA polymerase NS5 is phosphorylated on serines residues. This phosphorylation may trigger NS5 nuclear localization (By similarity).
• PTM: Envelope protein E and non-structural protein 1 are N-glycosylated (By similarity).
• MISCELLANEOUS: The virion is assembled in the endoplasmic reticulum lumen, transported by vesicles to the Golgi, then transported again to the cell membrane where it is released outside the cell.
• SIMILARITY: Contains 1 helicase ATP-binding domain.
• SIMILARITY: Contains 1 helicase C-terminal domain.
• SIMILARITY: Contains 1 peptidase S7 domain [view classification].
• SIMILARITY: Contains 1 RdRp catalytic domain.