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dCMP deaminase was partially purified from BHK-21/C13 cells grown in culture. The molecular weight of the enzyme was estimated by gel filtration and gradient centrifugation to be 130000 and 115000 respectively. The enzyme had a pH optimum of 8.4. Its activity versus substrate concentration curve was sigmoid, the substrate concentration at half-maximal velocity being 4.4mm. dCTP activated the deaminase maximally at 40mum, gave a hyperbolic curve for activity versus dCMP concentration and a K(m) value for dCMP of 0.91mm. dCTP activation required the presence of Mg(2+) or Mn(2+) ions. dTTP inhibited the deaminase maximally at 15mum; the inhibition required the presence of Mg(2+) or Mn(2+) ions. The enzyme was very heat-labile but could be markedly stabilized by dCTP at 0.125mm and ethylene glycol at 20% (v/v).

Deoxycytidylate deaminase. Properties of the enzyme from cultured kidney cells of baby hamster