The impact of multidideoxynucleoside resistance-conferring mutations in human immunodeficiency virus type 1 reverse transcriptase on polymerase fidelity and error specificity

Lisa F. Rezende, Kenneth Curr, Takamasa Ueno, Hiroaki Mitsuya, Vinayaka R. Prasad

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Variants of human immunodeficiency virus type 1 (HIV-1) that are highly resistant to a number of nucleoside analog drugs have been shown to develop in some patients receiving 2',3'-dideoxy-3'-azidothymidine therapy in combination with 2',3'-dideoxycytidine or 2',3'-dideoxyinosine. The appearance, in the reverse transcriprase (RT), of the Q151M mutation in such variants precedes the sequential appearance of three or four additional mutations, resulting in a highly resistant virus. Three of the affected residues are proposed to lie in the vicinity of the template-primer in the three-dimensional structure of the HIV-1 RT-double-stranded DNA complex. The amino acid residue Q151 is thought to be very near the templating base. The nucleoside analog resistance mutations in the β9-β10 (M184V) and the β5a (E89G) strands of HIV-1 RT were previously shown to increase the fidelity of deoxynucleoside triphosphate insertion. Therefore, we have examined wild- type HIV-1(BH10) RT and two nucleoside analog-resistant variants, the Q151M and A62V/V751/F77L/F116Y/Q151M (VILYM) RTs, for their overall forward mutation rates in an M13 gapped-duplex assay that utilizes lacZα as a reporter. The overall error rates for the wild-type, the Q151M, and the VILYM RTs were 4.5 x 10-5, 4.0 x 10-5, and 2.3 x 10-5 per nucleotide, respectively. Although the mutant RTs displayed minimal decreases in the overall error rates compared to wild-type RT, the error specificities of both mutant RTs were altered. The Q151M RT mutant generated new hot spots, which were not observed for wild-type HIV-1 RT previously. The VILYM RT showed a marked reduction in error rate at two of the predominant mutational hot spots that have been observed for wild-type HIV-1 RT.

Original languageEnglish (US)
Pages (from-to)2890-2895
Number of pages6
JournalJournal of virology
Volume72
Issue number4
Publication statusPublished - Apr 1 1998

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ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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