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9-R-2-Phosphonomethoxypropyl adenine (PMPA) is an acyclic nucleoside phosphonate analog that has demonstrated efficacy against human immunodeficiency virus (HIV). We recently described the synthesis, metabolism, and biological activities of bis(isopropyloxymethylcarbonyl)PMPA [bis(poc)PMPA] as an orally bioavailable prodrug for PMPA. Among a large panel of drug-resistant HIV type 1 variants, only the K65R virus was resistant to PMPA. K65R virus also showed reduced susceptibility to bis(poc)PMPA, although the prodrug could still inhibit these viruses at submicromolar, nontoxic concentrations. Among a panel of seven primary clinical isolates from patients with diverse treatment histories, only one isolate showed reduced susceptibility to PMPA and was found to carry three mutations (M41L, T69N, R73K) in its reverse transcriptase catalytic domain.

antimicrobial agents and chemotherapy

Antiviral Activities of 9- <i>R</i> -2-Phosphonomethoxypropyl Adenine (PMPA) and Bis(isopropyloxymethylcarbonyl)PMPA against Various Drug-Resistant Human Immunodeficiency Virus Strains

Antiviral Activities of 9- R -2-Phosphonomethoxypropyl Adenine (PMPA) and Bis(isopropyloxymethylcarbonyl)PMPA against Various Drug-Resistant Human Immunodeficiency Virus Strains