Reverse transcriptases from human immunodeficiency virus type 1 (HIV-1), HIV-2, and simian immunodeficiency virus (SIVMAC) are susceptible to inhibition by foscarnet and 3'-azido-3'-deoxythymidine triphosphate.

Reverse transcriptases from human immunodeficiency virus type 1 (HIV-1), HIV-2, and simian immunodeficiency virus (SIV) were investigated with respect to susceptibilities to the reverse transcriptase inhibitors foscarnet and 3'-azido-3'-deoxythymidine triphosphate (AZTTP). The different reverse transcriptases had the same sensitivity to foscarnet (50% inhibition at 0.10 to 0.16 microM). The Ki values for AZTTP were 0.01 to 0.02 microM for HIV-1 reverse transcriptase and 0.02 to 0.03 microM for HIV-2 and SIVMAC reverse transcriptases.