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Partial Purification and Characterization of the Ribonucleotide Reductase Induced by Herpes Simplex Virus Infection of Mammalian Cells

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Journal J Virol
Date 1981 Feb 1
PMID 6261008
Citations 24
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Abstract

In this report we confirm and further characterize the induction of a novel ribonucleotide reductase after herpes simplex virus infection of mammalian cells. Induction of the enzyme was observed at a multiplicity of infection of 1 PFU/cell or greater and was found to be maximal (three- to sixfold the activity in mock-infected controls at 6 to 8 h postinfection at a multiplicity of infection of 10 PFU/cell. Partial purification and subsequent characterization of the reductase activity from infected cells demonstrated the existence of two enzymes which could be separated by precipitation with ammonium sulfate. One of the activities precipitated at between 35 and 55% salt saturation, as did the enzyme from control cells, whereas the novel activity precipitated at 0 to 35% saturation. This latter enzyme was similar to the herpes simplex virus-induced reductase described by others in its lack of requirement for Mg2 and its resistance to inhibition by dTTP and dATP; in addition, we found that it was inhibited by ATP, whereas the enzyme from control cells displayed an absolute requirement for the nucleotide. Both enzymes were equally inhibited by pyridoxal phosphate and showed similar cold and heat stability. The enzyme induced by herpes simplex virus infection, however, was much more labile than the control enzyme upon purification.

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