Induction of thymidine kinase and DNase in varicella-zoster virus-infected cells and kinetic properties of the virus-induced thymidine kinase.
J Virol, 1979/7;31(1):172-7.
Cheng YC, Tsou TY, Hackstadt T, Mallavia LP
PMID: 228052
Impact factor: 6.549
Abstract
Thymidine kinase (TK), DNA polymerase, and DNase activities were induced in human foreskin fibroblasts after varicella-zoster virus infection. The induced TK and DNase activities have electrophoretic mobilities different from the corresponding host enzymes. Varicella-zoster virus-induced TK was purified and separated from the host enzyme by affinity column chromatography. This enzyme has been shown to have a broader substrate specificity with respect to either the phosphate donor or acceptor as compared with human cytoplasmic and mitochondrial TKs. The best phosphate donor is ATP, with a Km of 16 microM. The Km values of thymidine, deoxycytidine, and 5-propyl deoxyuridine were estimated to be 0.4, 180, and 0.8 microM, respectively. The Ki values for several analogs of thymidine such as 5-iododeoxyuridine, arabinofuranosylthymine, 5-ethyl deoxyuridine, and 5-cyanodeoxyuridine were also examined. TTP acted as a noncompetitive inhibitor with respect to thymidine with a Ki of 5 microM. The kinetic behavior of varicella-zoster virus-induced TK is different from human cytoplasmic, human mitochondrial, and herpes simplex virus type 1- and 2-induced TKs.
MeSH terms
Cell Line; DNA-Directed DNA Polymerase; Deoxyribonucleases; Enzyme Induction; Fibroblasts; Herpesvirus 3, Human; Humans; Kinetics; Nucleotides; Skin; Substrate Specificity; Thymidine Kinase
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