in the absence of k+ , the hydrolysis of low-energy phosphoenzyme ( e2p ) of ( na , k ) -atpase , but not ca-atpase of sarcoplasmic reticulum , was inhibited by na+ or by amine compounds , such as tris , imidazole , arginine , or lysine , with half-maximum inhibition concentrations of millimolar order at ph 7.4 and 0 degrees c .
C0020291
hydrolysis
C0001473
atpase