2.7.1.33 ATP - 660631, 660712, 660726, 661331, 662406, 662408, 662455, 662687, 671053, 671347, 671767, 672234, 674291, 674852, 675942, 676548, 676884, 677154 2.7.1.33 ATP absolutely specific for 662369 2.7.1.33 ATP can partially be substituted by CTP or GTP 662369 2.7.1.33 ATP three-dimensional binding site structure, Arg243 is involved 662251 2.7.1.33 CTP less active than ATP 662369 2.7.1.33 GTP less active than ATP 662369