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J. Virol., Apr 1996, 2146-2153, Vol 70, No. 4
Copyright © 1996, American Society for Microbiology

Effects of zidovudine-selected human immunodeficiency virus type 1 reverse transcriptase amino acid substitutions on processive DNA synthesis and viral replication

AM Caliendo, A Savara, D An, K DeVore, JC Kaplan and RT D'Aquila
Infectious Disease Unit, Massachusetts General Hospital, Charlestown, MA 02129, USA.

Certain amino acid substitutions in the reverse transcriptase (RT), including D67N, K70R, T215Y, and K219Q, cause high-level resistance of human immunodeficiency virus type 1 (HIV-1) to zidovudine (3'- azidothymidine; AZT) and appear to approximate the template strand of the enzyme-template-primer complex in structural models. We studied whether this set of mutations altered RT-template-primer interaction as well as their effect on virus replication in the absence of inhibitor. When in vitro polymerization was limited to a single association of an RT with an oligodeoxynucleotide-primed heteropolymeric RNA template (a single processive cycle), recombinant-expressed mutant 67/70/215/219 RT synthesized 5- to 10-fold more high-molecular-weight DNA products (>200 nucleotides in length) than wild-type RT. This advantage was maintained as deoxynucleoside triphosphate (dNTP) concentrations were decreased to limiting levels. In contrast, no difference was seen between wild-type and mutant RTs under conditions allowing repeated associations of enzyme with template-primer. Because intracellular dNTP concentrations are low prior to mitogenic stimulation, we compared replication of mutant 67/70/215/219 virus and wild-type virus in peripheral blood mononuclear cells (PBMC) stimulated before and after infection. In the absence of inhibitor, mutant 67/70/215/219 virus had a replication advantage in PBMC stimulated with phytohemagglutinin and interleukin-2 after infection, but virus replication was similar in PBMC stimulated before infection in vitro. The results confirm that RT mutations D67N, K70R, T215Y, and K219Q affect an enzyme-template-primer interaction in vitro and suggest that such substitutions may affect HIV-1 pathogenesis during therapy by increasing viral replication capacity in cells stimulated after infection.


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