4.1.1.33 ATP - 681448, 688660, 690629, 693443, 714403, 715621 4.1.1.33 ATP 1 mM ATP4- above that complexed at the substrate. MgATP2- decreases the Km from 0.45 mM to 0.15 mM 4377 4.1.1.33 ATP activates 4378