the interactions of monovalent cations and of the k+-specific ionophore , valinomycin , with the ca2+-atpase of skeletal muscle of sarcoplasmic reticulum have been studied in the absence of cation gradients by their effects on enzyme turnover and on the atp plus ca2+-dependent enhanced fluorescence of the atp analogue , 2',3'-o- ( 2,4,6-trinitrocyclohexyldienylidine ) -adenosine 5'-triphosphate ( tnp-atp ) ( watanabe , t. , and inesi , g. ( 1982 ) j. biol . chem . 257 , 11510-11516 ) .
C0007449
monovalent cations
C0007447
cation