in the absence of solvent , the interaction of magnesium with the calcium-deprived atpase was also characterized from the point of view of phosphoenzyme formation from atp or pi at ph 7 in the absence of potassium : we found that calcium-independent phosphorylation was slower when phosphate was added to sr vesicles preincubated with magnesium that when magnesium was added to vesicles preincubated with phosphate , suggesting that preincubation with magnesium had depleted the phosphate-reactive conformation of the atpase .
C0001476
calcium
C0001473
atpase