Dengue virus NS2B-NS3 protease – NS4A-2K-NS4B substrate interface (DENV NS2B-NS3/NS4A-2K-NS4B)

The Dengue virus NS2B-NS3 – NS4A-2K-NS4B interface is a critical regulatory site where the viral NS2B-NS3 serine protease complex processes the polyprotein precursor into functional non-structural proteins (UniProt: P29990). The NS3 protein contains the catalytic triad but requires the NS2B cofactor to adopt a stable, active conformation capable of substrate binding (PubMed: 26011163). A pivotal event at this interface is the cleavage of the NS4A/2K junction, which serves as a prerequisite for subsequent host-mediated cleavage at the 2K/NS4B site, allowing for the proper assembly of the viral replication complex (PubMed: 11070009). Because this specific proteolytic processing is indispensable for the viral life cycle and lacks a human homolog, it is a primary focus for the development of direct-acting antivirals (PubMed: 30249529). Drug discovery efforts typically target the protease active site or the allosteric interface between NS2B and NS3 to prevent the formation of a functional enzyme-substrate complex (PubMed: 28401369). Successful inhibition at this interface effectively halts viral replication and reduces the progression of Dengue-related pathologies.

Other names

Dengue virus NS2B-NS3 protease complexNS4A-2K-NS4B cleavage siteDENV NS3 protease-substrate complexNS2B-NS3/NS4A-2K-NS4B junction

Inhibition of viral polyprotein processing by blocking the NS2B-NS3 protease activity at the NS4A-2K-NS4B junction, preventing viral replication.