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Journal of Virology, April 2000, p. 3579-3585, Vol. 74, No. 8
McGill University AIDS Centre, Lady Davis
Institute-Jewish General Hospital,1 and
Department of Microbiology and Immunology, McGill
University,2 Montréal, Québec,
Canada
Received 29 September 1999/Accepted 25 January 2000
Nucleoside analog chain terminators such as
3'-azido-3'-deoxythymidine (AZT) and 2',3'-dideoxy-3'-thiacytidine
(3TC) represent an important class of drugs that are used in the clinic
to inhibit the reverse transcriptase (RT) of human immunodeficiency
virus type 1. Recent data have suggested that mutant enzymes associated with AZT resistance are capable of removing the chain-terminating residue with much greater efficiency than wild-type RT and this may, in
turn, facilitate rescue of DNA synthesis; these experiments were
performed using physiological concentrations of pyrophosphate or
nucleoside triphosphates, respectively. The present study demonstrates that the M184V mutation, which confers high-level resistance to 3TC,
can severely compromise the removal of chain-terminating nucleotides.
Pyrophosphorolysis on 3TC-terminated primer strands was not detectable
with M184V-containing, as opposed to wild-type, RT, and rescue of
AZT-terminated DNA synthesis was significantly decreased with the
former enzyme. Thus, mutated RTs associated with resistance to AZT and
3TC possess opposing, and therefore incompatible, phenotypes in this
regard. These results are consistent with tissue culture and clinical
data showing sustained antiviral effects of AZT in the context of
viruses that contain the M184V mutation in the RT-encoding gene.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
The M184V Mutation in the Reverse Transcriptase of
Human Immunodeficiency Virus Type 1 Impairs Rescue of
Chain-Terminated DNA Synthesis
*
Corresponding author. Mailing address: McGill AIDS
Centre, Lady Davis Institute-Jewish General Hospital, 3755 Chemin
Côte-Ste-Catherine, Montréal, Québec, Canada H3T 1E2.
Phone: (514) 340-7536. Fax: (514) 340-7537. E-mail:
mdwa{at}musica.mcgill.ca.
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