title: Ribonucleotide reductase of herpes simplex virus type 2 resembles that of herpes simplex virus type 1.
abstract: The ribonucleotide reductase (ribonucleoside-diphosphate reductase; EC 1.17.4.1) induced by herpes simplex virus type 2 infection of serum-starved BHK-21 cells was purified to provide a preparation practically free of both eucaryotic ribonucleotide reductase and contaminating enzymes that could significantly deplete the substrates. Certain key properties of the herpes simplex virus type 2 ribonucleotide reductase were examined to define the extent to which it resembled the herpes simplex virus type 1 ribonucleotide reductase. The herpes simplex virus type 2 ribonucleotide reductase was inhibited by ATP and MgCl2 but only weakly inhibited by the ATP X Mg complex. Deoxynucleoside triphosphates were at best only weak inhibitors of this enzyme. ADP was a competitive inhibitor (K'i, 11 microM) of CDP reduction (K'm, 0.5 microM), and CDP was a competitive inhibitor (K'i, 0.4 microM) of ADP reduction (K'm, 8 microM). These key properties closely resemble those observed for similarly purified herpes simplex virus type 1 ribonucleotide reductase and serve to distinguish these virally induced enzymes from other ribonucleotide reductases.
mesh_terms: D000255:Adenosine Triphosphate / Q000494:pharmacology; D003565:Cytidine Diphosphate / Q000378:metabolism; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology; D012264:Ribonucleotide Reductases / Q000037:antagonists & inhibitors / Q000302:isolation & purification*; D018139:Simplexvirus / Q000201:enzymology*
chemical_list: D003565:Cytidine Diphosphate; D000255:Adenosine Triphosphate; D012264:Ribonucleotide Reductases; D008274:Magnesium