Gene Accession

P27914

Gene Alias

Genome polyprotein [Cleaved into: Envelope protein E; Non-structural protein 1 (NS1); Non-structural protein 2A (NS2A); Serine protease NS3 (EC 3.4.21.91) (EC 3.6.1.15) (EC 3.6.4.13) (Non-structural protein 3)]

Background

FUNCTION: [Envelope protein E]: Binds to host cell surface receptor and mediates fusion between viral and cellular membranes. Envelope protein is synthesized in the endoplasmic reticulum in the form of heterodimer with protein prM. They play a role in virion budding in the ER, and the newly formed immature particle is covered with 60 spikes composed of heterodimer between precursor prM and envelope protein E. The virion is transported to the Golgi apparatus where the low pH causes dissociation of PrM-E heterodimers and formation of E homodimers. prM-E cleavage is inefficient, and many virions are only partially matured. These uncleaved prM would play a role in immune evasion. {ECO:0000250|UniProtKB:P17763}.; FUNCTION: [Non-structural protein 1]: Involved in immune evasion, pathogenesis and viral replication. Once cleaved off the polyprotein, is targeted to three destinations: the viral replication cycle, the plasma membrane and the extracellular compartment. Essential for viral replication. Required for formation of the replication complex and recruitment of other non-structural proteins to the ER-derived membrane structures. Excreted as a hexameric lipoparticle that plays a role against host immune response. Antagonizing the complement function. Binds to the host macrophages and dendritic cells. Inhibits signal transduction originating from Toll-like receptor 3 (TLR3). {ECO:0000250|UniProtKB:Q9Q6P4}.; FUNCTION: [Non-structural protein 1]: Disrupts the host endothelial glycocalyx layer of host pulmonary microvascular endothelial cells, inducing degradation of sialic acid and shedding of heparan sulfate proteoglycans. NS1 induces expression of sialidases, heparanase, and activates cathepsin L, which activates heparanase via enzymatic cleavage. These effects are probably linked to the endothelial hyperpermeability observed in severe dengue disease. {ECO:0000250|UniProtKB:P17763}.; FUNCTION: [Non-structural protein 2A]: Component of the viral RNA replication complex that functions in virion assembly and antagonizes the host immune response. {ECO:0000250|UniProtKB:P17763}.; FUNCTION: Serine protease subunit NS2B: Required cofactor for the serine protease function of NS3. May have membrane-destabilizing activity and form viroporins (By similarity). {ECO:0000250|UniProtKB:P17763, ECO:0000255|PROSITE-ProRule:PRU00859}.; FUNCTION: [Serine protease NS3]: Displays three enzymatic activities: serine protease, NTPase and RNA helicase. NS3 serine protease, in association with NS2B, performs its autocleavage and 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. {ECO:0000255|PROSITE-ProRule:PRU00860}.