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J Virol. 1997 Jun;71(6):4472-8.

Incorporation of Pr160(gag-pol) into virus particles requires the presence of both the major homology region and adjacent C-terminal capsid sequences within the Gag-Pol polyprotein.

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  • 1Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.


The determinants critical for the incorporation of Pr160(gag-pol) into human immunodeficiency virus type 1 (HIV-1) particles were examined by cotransfecting cells with (i) a plasmid expressing wild-type Gag protein and (ii) a series of chimeric Gag-Pol expression plasmids in which individual murine leukemia virus (MLV) Gag regions and subdomains precisely replaced their HIV-1 counterparts. The presence of the MLV MA and NC Gag regions in the chimeric Gag-Pol precursor had no detectable effect on the incorporation of Gag-Pol into progeny virions. In contrast, the entire HIV-1 CA region was required to achieve wild-type levels of Gag-Pol assembly into particles; both the CA major homology region and the adjacent C-terminal CA sequences play dominant roles in this process yet, when assayed in the context of a chimeric Gag-Pol polyprotein, restored the defect affecting Gag-Pol incorporation to approximately half of the wild-type level.

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