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The PM-specific localization of HIV-1 Gag is a crucial early step in infectious progeny production. The interaction between the MA highly basic region (MA-HBR) of Gag and the PM-specific lipid PI(4,5)P2 is critical for Gag localization to the PM. Additionally,in vitro evidence has indicated that MA-RNA binding prevents nonspecific binding of Gag to non-PI(4,5)P2-containing membranes. However, cell-based evidence supporting a role for HIV-1 MA-RNA binding in PM-specific subcellular localization has been scarce; thus, it remained possible that in cells, just the high basic charge or the PI(4,5)P2 binding ability is sufficient for MA to direct Gag specifically to the PM. The present study reveals for the first time an excellent correlation between RNA binding of the MA-HBR and inhibition of promiscuous Gag localization, both within the cells, and thereby provides cell-based evidence supporting a mechanism in which HIV-1 MA binding to RNA ensures the specific localization of Gag to the PM.

Relationships between MA-RNA Binding in Cells and Suppression of HIV-1 Gag Mislocalization to Intracellular Membranes