Viral enzyme (None (plural, so no common abbreviation for the class; individual enzymes sometimes have abbreviations, e.g., HIV-1 PR for HIV-1 protease))

Viral enzymes are proteins encoded by viral genomes that catalyze essential biochemical reactions for viral replication, gene expression, assembly, and release. Unlike host enzymes, many viral enzymes have unique structural and mechanistic features, making them attractive targets for antiviral drug development. Common types include proteases (cleave viral polyproteins for maturation), polymerases (copy viral genetic material), helicases (unwind nucleic acids), integrases (insert viral DNA into host genome), and reverse transcriptases (convert RNA to DNA). Inhibitors targeting these enzymes have transformed therapy for diseases like HIV, hepatitis C, and COVID-19. However, because viruses rapidly evolve, resistance can develop, and drug toxicity or off-target effects may arise. "Viral enzymes" as a class includes many distinct molecular entities; for therapeutic, diagnostic, or research purposes, precise identification of the specific viral enzyme and associated virus is essential.

Other names

Viral enzyme (singular and plural)Virus-encoded enzymeExamples (not full class): HIV protease, reverse transcriptase, NS3 protease, RNA-dependent RNA polymerase

Inhibition of enzymatic activity required for viral replication or maturation (e.g., blocking active site binding, allosteric modulation) Prevention of viral attachment/entry (if targeting enzymes involved in entry/fusion) Disruption of viral DNA/RNA synthesis Interference with integration into host genome