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. 1993 Oct;37(10):2231–2234. doi: 10.1128/aac.37.10.2231

High-level resistance to (-) enantiomeric 2'-deoxy-3'-thiacytidine in vitro is due to one amino acid substitution in the catalytic site of human immunodeficiency virus type 1 reverse transcriptase.

C A Boucher 1, N Cammack 1, P Schipper 1, R Schuurman 1, P Rouse 1, M A Wainberg 1, J M Cameron 1
PMCID: PMC192256  PMID: 7504909

Abstract

Passage of human immunodeficiency virus type 1 in the presence of increasing 2'-deoxy-3'-thiacytidine (3TC) concentrations results in high-level (> 100-fold) 3TC-resistant viruses. All 3TC-resistant viruses possess a substitution at the second codon (from a methionine into an isoleucine) at position 184 within the highly conserved motif (YMDD) of human immunodeficiency virus type 1 reverse transcriptase. 3TC-resistant viruses were cross-resistant to the (-) enantiomer of the fluorinated derivative of BCH-189 but remained susceptible to 2',3'-dideoxyinosine and 2',3'-dideoxycytidine. The susceptibilities of the 3TC-resistant viruses to the (+) enantiomers of BCH-189 and the fluorinated derivative of BCH-189 demonstrate an enantiomeric specificity for viruses selected under these conditions. Introduction of an isoleucine substitution at codon 184 into a background of two known 3'-azido-3'-deoxythymidine resistance mutations (amino acids 41 and 215) restored the susceptibility of this virus to 3'-azido-3'-deoxythymidine.

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Selected References

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