Abstract
The matrix domain of the human immunodeficiency virus type 1 (HIV-1) Gag protein contains a highly basic region near its amino terminus. It has been proposed that this basic domain, in conjunction with the HIV-1 accessory protein Vpr, is responsible for the localization of the HIV-1 preintegration complex to the nucleus in nondividing cells. It has also been postulated that the matrix basic domain assists in the targeting of the HIV-1 Gag precursor Pr55Gag to the plasma membrane during virus assembly. To evaluate the role of this highly basic sequence during infection of primary human monocyte-derived macrophages, single- and double-amino-acid-substitution mutations were introduced, and the effects on virus particle production, Gag protein processing, envelope glycoprotein incorporation into virus particles, and virus infectivity in the CEM(12D-7) T-cell line, peripheral blood mononuclear cells, and primary human monocyte-derived macrophages were analyzed. Although modest effects on virus particle production were observed with some of the mutants, none abolished infectivity in primary human monocyte-derived macrophages. In contrast with previously reported studies involving some of the same matrix basic domain mutants, infectivity in monocyte-derived macrophages was retained even when combined with a vpr mutation.
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