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The immature Gag lattice is a critical structural feature of assembling HIV-1 particles, which is primarily important for virion formation and release. While Gag forms a hexameric lattice, driven primarily by the capsid domain, the MA domain additionally trimerizes where three Gag hexamers meet. MA mutants that are defective for trimerization are deficient for Env incorporation and replication, suggesting a requirement for trimerization of the MA domain of Gag in Env incorporation. This study used a gain-of-function, forced viral evolution approach to rescue HIV-1 mutants that are defective for MA trimerization. Compensatory mutations that rescue virus replication do so by restoring Env incorporation and MA trimer formation. This study supports the importance of MA domain trimerization in HIV-1 replication and the potential of the trimer interface as a therapeutic target.

HIV-1 Matrix Trimerization-Impaired Mutants Are Rescued by Matrix Substitutions That Enhance Envelope Glycoprotein Incorporation