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ABSTRACT:: The efficacy of regimens that include both zidovudine and nevirapine can be explained by the synergistic interactions between these drugs. N348I in HIV-1 reverse transcriptase (RT) confers decreased susceptibility to zidovudine and nevirapine. Here we demonstrate that N348I reverses the synergistic inhibition of HIV-1 by zidovudine and nevirapine. Also, the efficiency of zidovudine-monophosphate excision in the presence of nevirapine is greater for N348I HIV-1 RT compared to the wild-type enzyme. These data help explain the frequent selection of N348I in regimens that contain zidovudine and nevirapine, and suggest that the selection of N348I should be monitored in resource-limited settings where these drugs are routinely used.
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