Tenofovir diphosphate is an inhibitor of HIV reverse transcriptase (Kis = 0.022 and 1.55 µM for RNA and DNA, respectively) and hepatitis B virus (HBV) polymerase (Ki = 0.18 µM). It is selective for these enzymes over DNA polymerase alpha and beta, as well as mitochondrial DNA polymerase gamma (Kis = 5.2, 81.7, and 59.5 µM, respectively). Tenofovir diphosphate is formed intracellularly through phosphorylation of the prodrugs tenofovir and tenofovir disoproxil by nucleotide kinases. Increased levels of tenofovir diphosphate in isolated peripheral blood mononuclear cells (PBMCs) correlate with a decrease in the risk of simian HIV (SHIV) acquisition in a macaque model of rectal SHIV transmission.
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