Use of chimeric human immunodeficiency virus types 1 and 2 reverse transcriptases for structure-function analysis and for mapping susceptibility to nonnucleoside inhibitors

Guozhe Yang, Qingbin Song, MacArthur Charles, William C. Drosopoulos, Edward Arnold, Vinayaka R. Prasad

Research output: Contribution to journalArticle

19 Scopus citations


The human immunodeficiency virus type 1 and type 2 (HIV-1 and HIV-2) reverse transcriptases (RTs) are evolutionary related. To study the effect of homologous sequence replacements on polymerase function and to map the determinants of the lack of susceptibility of HIV-2 RT to nonnucleoside drugs, a series of chimeric HIV-1/HIV-2 RTs were constructed. Analysis of the chimeric RTs showed that wild-type levels of RNA-dependent DNA polymerase activity were retained when both finger and palm subdomains were exchanged as a unit between the two parental RTs. Analysis of enzymatically active chimeras for inhibition by the thiobenzimidazolone derivative TIBO R82150 showed that a segment of HIV-2 RT at 212-250, when placed in the HIV-1 RT context, conferred a 40-fold decrease in susceptibility to TIBO R82150. Site- directed mutagenesis of this segment found Tyr227 to be a key residue in this segment for the natural resistance of HIV-2 RT to TIBO R82150.

Original languageEnglish (US)
Pages (from-to)326-333
Number of pages8
JournalJournal of Acquired Immune Deficiency Syndromes and Human Retrovirology
Issue number4
Publication statusPublished - Jan 1 1996



  • Chimeric reverse transcriptases
  • Nonnucleoside reverse transcriptase inhibitor resistance
  • Structure-function

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Virology

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