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J. Virol., May 1995, 3216-3219, Vol 69, No. 5
G Englund, TS Theodore, EO Freed, A Engleman and MA Martin
Certain human immunodeficiency virus type 1 (HIV-1) isolates are able to
productively infect nondividing cells of the monocyte/macrophage lineage.
We have used a molecular genetic approach to construct two different HIV-1
integrase mutants that were studied in the context of an infectious,
macrophage-tropic HIV-1 molecular clone. One mutant, HIV- 1 delta D(35)E,
containing a 37-residue deletion within the central, catalytic domain of
integrase, was noninfectious in both peripheral blood mononuclear cells and
monocyte-derived macrophages. The HIV-1 delta D(35)E mutant, however,
exhibited defects in the assembly and/or release of progeny virions in
transient transfection assays, as well as defects in entry and/or viral DNA
synthesis during the early stages of monocyte-derived macrophage infection.
The second mutant, HIV-1D116N/8, containing a single Asp-to-Asn
substitution at the invariant Asp-116 residue of integrase, was also
noninfectious in both peripheral blood mononuclear cells and
monocyte-derived macrophages but, in contrast to HIV-1 delta D(35)E, was
indistinguishable from wild-type virus in reverse transcriptase production.
PCR analysis indicated that HIV- 1D116N/8 entered monocyte-derived
macrophages efficiently and reverse transcribed its RNA but was unable to
complete its replication cycle because of a presumed block to integration.
These data are consistent with the hypothesis that integration is an
obligate step in productive HIV-1 infection of activated peripheral blood
mononuclear cells and primary human macrophage cultures.
Copyright © 1995, American Society for Microbiology
Integration is required for productive infection of monocyte-derived macrophages by human immunodeficiency virus type 1
Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.
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