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During virus assembly, HIV-1 Gag-Pol is packaged into virions via interaction with Pr55gag. Studies suggest that Gag-Pol by itself is incapable of virus particle assembly or cell release, perhaps due to the lack of a budding domain in the form of p6gag, which is truncated within Gag-Pol because of a ribosomal frameshift during Gag translation. Additionally (or alternatively), large molecular size may not support Gag-Pol assembly into virus-like particles (VLPs) or release from cells. To test these hypotheses, we constructed Gag-Pol expression vectors retaining and lacking p6gag, and then reduced Gag-Pol molecular size by removing various lengths of the Pol sequence. Results indicate that Gag-Pol constructs retaining p6gag were capable of forming VLPs with a WT HIV-1 particle density. Gag-Pol molecular size reduction via partial removal of the Pol sequence mitigated the Gag-Pol assembly defect to a moderate degree. Our results suggest that the Gag-Pol assembly and budding defects are largely due to a lack of p6gag, but also in part due to size limitation.

p6gag domain confers cis HIV-1 Gag-Pol assembly and release capability