Human immunodeficiency virus 1 Gag-membrane interface (Gag-membrane interface) (Gag-membrane interface)

The HIV-1 Gag-membrane interface is a specialized site of interaction between the viral Gag polyprotein and the host cell's plasma membrane, essential for the assembly and budding of new virions (Ono, 2010). This interaction is primarily mediated by the N-terminal Matrix (MA) domain of Gag, which specifically recognizes and binds to the host phospholipid phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] (Saad et al., 2006). Binding to this lipid, along with the insertion of a myristoyl group into the membrane (the myristoyl switch), anchors Gag to the assembly site and facilitates the recruitment of other viral components (Dick & Vogt, 2014). As a critical bottleneck in the viral replication cycle, this interface is a target for novel antiretroviral strategies aimed at preventing the formation of infectious particles. Disrupting this protein-lipid interaction offers a mechanism distinct from current protease or integrase inhibitors, potentially overcoming existing drug resistance (Alfadhli et al., 2009). Experimental inhibitors such as the L-W peptide and small molecules like NSC 260594 have demonstrated the feasibility of targeting this site in preclinical models (Vlach & Saad, 2015). However, the challenge remains to develop inhibitors that are highly selective for the viral protein to avoid disrupting essential host cellular processes that rely on PI(4,5)P2 signaling.

Other names

Matrix-membrane interfaceMA-PI(4,5)P2 interfaceGag-plasma membrane interaction siteHIV-1 MA-lipid interfaceGag-phosphoinositide interface

Inhibition of Gag polyprotein recruitment to the plasma membrane by disrupting the specific interaction between the Matrix (MA) domain and host phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) (Alfadhli et al., 2009).