3.6.1.28 NO3- stimulation by anions with the following decreasing order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme. The effect of NO3- is maximal at pH 7-8, it is negligible at pH 6.5 210006 3.6.1.28 SCN- stimulation by anions with the following decreasing order of effectiveness: SCN-, I-, NO3-, Br-, Cl-, membrane-associated enzyme 210006 3.6.1.28 Zn2+ 0.01-0.05 mM at pH 8.0 activates GST-tagged thiamine triphosphatase by about 30% in the presence of Mg2+ 667797 3.6.1.28 Zn2+ 30% of the activation with Mg2+ 210020 3.6.1.28 Zn2+ in the presence of Mg2+ at pH 8 667797 3.6.1.28 Zn2+ inhibits at micromolar concentrations at pH 8.0, activates at pH 6.0 655738