Dengue virus NS2B-NS3 serine protease (NS2B/NS3 protease)

The **Dengue virus NS2B-NS3 serine protease** is a two-component viral enzyme essential for dengue virus replication, composed of the NS3 protease domain and its cofactor, the membrane-associated NS2B region[1][5][7]. This protease is responsible for cleaving the viral polyprotein at several nonstructural sites, enabling the production of functional viral proteins necessary for genome replication and assembly[5][6][7]. The enzyme is anchored to the endoplasmic reticulum via transmembrane helices of NS2B and requires the active participation of both NS2B and NS3 regions for catalytic activity[1][7]. Because of its central role in the viral lifecycle and absence in human cells, it is a primary therapeutic target in dengue drug development efforts, with both active-site and allosteric inhibitors being explored as potential antiviral agents[4][6][8].

Other names

Dengue virus proteaseDENV NS2B/NS3 proteaseNS2B-NS3 proteaseFlaviviral NS2B/NS3 protease

Active-site inhibition (orthosteric): competitive inhibition by small molecules or peptides binding at the active site, blocking substrate access[1][6] Allosteric inhibition: small molecules (e.g., curcumin) bind to secondary sites, altering the enzyme conformation and preventing activation[4][8]