Thymidine kinase


  • Accession: Q9QNF7
  • Swissprot: KITH_HHV1
  • Organism: Human herpesvirus 1
  • Gene: TK
  • Target class: Kinase

Drug Relations:

Acyclovir is a synthetic purine nucleoside analogue with in vitro and in vivo inhibitory activity against herpes simplex virus types 1 (HSV-1), 2 (HSV-2), and varicella-zoster virus (VZV). The inhibitory activity of acyclovir is highly selective due to its affinity for the enzyme thymidine kinase (TK) encoded by HSV and VZV. This viral enzyme converts acyclovir into acyclovir monophosphate, a nucleotide analogue. The monophosphate is further converted into diphosphate by cellular guanylate kinase and into triphosphate by a number of cellular enzymes. In vitro, acyclovir triphosphate stops replication of herpes viral DNA. Bioactivity details MOA
anti-herpes agent; (Z)-isomer much less active against herpes simplex virus type 1 & somewhat less active against herpes simplex virus type 2 than is the (E)-isomer; both isomers show similar activity against vaccinia virus; RN given refers to (E)-trans-isomer; structure Bioactivity details MOA
An ACYCLOVIR analog that is a potent inhibitor of the Herpesvirus family including cytomegalovirus. Ganciclovir is used to treat complications from AIDS-associated cytomegalovirus infections. Bioactivity details MOA
The antiviral compound penciclovir has inhibitory activity against herpes simplex virus types 1 (HSV-1) and 2 (HSV-2). In cells infected with HSV-1 or HSV-2, the viral thymidine kinase phosphorylates penciclovir to a monophosphate form that, in turn, is converted by cellular kinases to the active form penciclovir triphosphate. Biochemical studies demonstrate that penciclovir triphosphate inhibits HSV polymerase competitively with deoxyguanosine triphosphate. Consequently, herpes viral DNA synthesis and, therefore, replication are selectively inhibited. Bioactivity details MOA
Bioactivity details MOA