FIG. 4.
Effect of asymmetrical dinucleoside tetraphosphatase on Ap4A (left panel) or Ap5A (right panel) obtained from ATP or p4A, catalyzed by acyl-CoA synthetase. Reaction mixtures containing 50 mM Tris-HCl (pH 7.5), 1 mM MgCl2, and purified (see Materials and Methods) Ap4A or Ap5A (33 μM) were treated with asymmetrical dinucleoside tetraphosphatase (0.4 or 0.7 mU/ml, respectively). At the times indicated, aliquots were taken and analyzed by HPLC.