Differential tolerance to DNA polymerization by HIV-1 reverse transcriptase on N6 adenine C10R and C10S benzo[a]pyrene-7,8-dihydrodiol 9,10-epoxide-adducted templates

Parvathi Chary, Constance M. Harris, Thomas M. Harris, R. Stephen Lloyd

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

To determine the effect of various stereoisomers of benzo[a]pyrene-7,8- dihydrodiol 9,10-epoxide (BPDE) on translesion bypass by human immunodeficiency virus-1 reverse transcriptase and its α-helix H mutants, six 33-mer templates were constructed bearing site- and stereospecific adducts. This in vitro model system was chosen to understand the structure- function relationships between the polymerase and damaged DNA during replication. Comparison of the replication pattern between wild type human immunodeficieney virus-1 reverse transcriptase and its mutants, using primers which were 3' to the lesion, revealed essentially similar patterns. While these primers terminated with all three of the C10R and two of the C10S BPDE-adducted templates 1 base 5' and 1 base 3' to the damaged site respectively, (+)-anti-trans-(C10S) BPDE-adducted DNA alone permitted the formation of full-length products. Utilization of a primer with its 3'- hydroxyl 1 base beyond the lesion resulted in full-length products with all the C10S BPDE-adducted templates and the (-)-syn-trans-(C10R)-BPDE- adducted template, following replication with either the wild type or mutant enzymes. However, the other two C10R BPDE-adducted templates failed to allow any primer extension, even with the wild type enzyme. Although T·P depletion studies further confirmed the differential primer extension abilities using the C10R and C10S adducted templates, their binding affinities were similar, yet distinct from the unadducted template.

Original languageEnglish (US)
Pages (from-to)5805-5813
Number of pages9
JournalJournal of Biological Chemistry
Volume272
Issue number9
DOIs
StatePublished - Feb 28 1997

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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