Abstract
Foscarnet is a pyrophosphate analogue with activity against herpesviruses, human immunodeficiency virus (HIV), and other RNA and DNA viruses. Foscarnet and its analogues achieve their antiviral effects via inhibition of viral polymerases, with such inhibition not being dependent on activation or phosphorylation of the compounds by viral or cellular proteins. Current evidence indicates that foscarnet interferes with exchange of pyrophosphate from deoxynucleoside triphosphate during viral replication by binding to a site on the herpesvirus DNA polymerase or HIV reverse transcriptase. Reviewed herein are basic findings regarding the mechanism of action and antiviral activity of foscarnet and the related compound phosphonoacetic acid (PAA), as well as findings regarding potential mechanisms of viral resistance and interactions with other antiviral agents.
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