So we need the divilus metal atom to basically give the ATP substrate molecule the appropriate shape so that it can actually interim bind to the active side of that nucleocide monophosphate kinase. So before the NTP substrate, in this particular case, ATP can bind onto the active side of that kinase, the NTP must bind to a dive of metal atom such as magnesium or manganese. So what happens is two oxygens on this triphosphate interact with our magnesium atom so we have the alpha oxygens, we have the beta oxygens, these two, and then we have these are the gamma oxygens because this is the alpha phosphorus atom, the beta phosphorus atom and the gamma phosphorus atom. And so the magnesium can either interact with the alpha and beta oxygens or with the alpha and gamma oxygens or as in this particular case, the beta and gamma oxygens. And each time the magnesium interacts with two different oxygens that creates its own unique conformation. And so different enzymes require a different interaction because different enzymes require a different shape.