HIV-1 Group-specific antigen (Gag), Polymerase (Pol), and Negative regulatory factor (Nef) proteins (Gag-Pol-Nef)

HIV-1 Group-specific antigen (Gag), Polymerase (Pol), and Negative regulatory factor (Nef) proteins are critical components of the Human Immunodeficiency Virus type 1 that serve as major targets for T-cell-mediated immunotherapy and vaccine development (UniProt P04591, P03366, P03406). Gag is a polyprotein precursor essential for viral assembly and structural integrity, while Pol encodes the vital enzymes reverse transcriptase, integrase, and protease required for viral replication (PubMed: 18929194). Nef is an accessory protein that plays a key role in pathogenesis by downregulating CD4 and MHC-I molecules to evade the host immune response (NIH/NIAID). Unlike the highly variable Envelope (Env) protein, Gag, Pol, and Nef contain highly conserved regions rich in epitopes recognized by CD8+ cytotoxic T-lymphocytes and CD4+ helper T-cells. Therapeutic and prophylactic vaccine candidates, such as those using viral vectors or DNA platforms, utilize these proteins to induce robust cellular immunity aimed at controlling viral replication and reducing the viral reservoir (PubMed: 25210124). Clinical trials have extensively evaluated these proteins to determine their efficacy in providing broad-spectrum protection against diverse HIV-1 subtypes (ClinicalTrials.gov).

Other names

HIV-1 Gag, Pol, and NefGPNHIV-1 internal proteinsHIV-1 T-cell immunogens

Induction of HIV-specific CD4+ and CD8+ T-cell responses to recognize and eliminate infected cells.