Second site reversion of HIV-1 envelope protein baseplate mutations maps to the matrix protein.

ABSTRACT: The HIV-1 Envelope (Env) protein cytoplasmic tail (CT) recently has been shown to assemble an unusual trimeric baseplate structure that locates beneath Env ectodomain trimers. Mutations at linchpin residues that help organize the baseplate impair virus replication in restrictive T cell lines but not in permissive cell lines. We have identified and characterized a second site suppressor of these baseplate mutations, located at residue 34 in the viral matrix (MA) protein, that rescues viral replication in restrictive cells. The suppressor mutation was dependent on the CT to exert its activity and did not appear to affect Env protein traffic or fusion functions in restrictive cells. Instead, the suppressor mutation increased Env incorporation into virions 3-fold and virus infectivity in singl

SUBMITTER: Alfadhli A 

PROVIDER: S-EPMC10878238 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature