Binding of adenine nucleotides induces conformational transformations of sarcoplasmic reticulum Ca-ATPase attended by changes of cation binding properties of the enzyme: I.M.Timonin, S.N.Dvoryantsev, M.I.Kaykov, V.V. Petrov, D.O.Levitsky, E.K.Ruuge. Institute of Experimental Cardiology, USSR Cardiology Research Center, Moscow, USSR