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. 1993 Dec;37(12):2612–2617. doi: 10.1128/aac.37.12.2612

Viral resistance to the thiazolo-iso-indolinones, a new class of nonnucleoside inhibitors of human immunodeficiency virus type 1 reverse transcriptase.

G Maass 1, U Immendoerfer 1, B Koenig 1, U Leser 1, B Mueller 1, R Goody 1, E Pfaff 1
PMCID: PMC192754  PMID: 7509144

Abstract

Thiazolo-iso-indolinone derivatives with high specificity toward the reverse transcriptase (RT) of human immunodeficiency virus type 1 (HIV-1) were identified. The most potent compound, BM +51.0836, inhibited HIV-1 RT at a 50% inhibitory concentration of 90 nM in vitro. In cell culture assays, similar 50% inhibitory concentrations were obtained with high specificity for HIV-1. These substances were equally active against a zidovudine-resistant isolate. No antiviral effect was observed with an HIV-2 isolate. HIV-1 isolates resistant to the thiazolo-iso-indolinones were generated in cell culture, and the nucleotide sequences of the respective RT genes were analyzed subsequently. Comparison of the deduced amino acid sequences with the wild-type sequence showed an amino acid change at position 181 (Tyr to Cys). Substitutions of amino acid Lys-101 and Lys-103 as well as Tyr-181 and/or Tyr-188 by site-directed mutagenesis led to resistance against the thiazolo-iso-indolinones. A chimeric HIV-2 RT, substituted with amino acids at positions 179 to 190 from HIV-1, acquired only partial susceptibility to BM +51.0836.

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Selected References

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