Kinetic parameters of αCaMKII activity stimulated by wild type and mutant CaMs, with respect to [ATP]. Steady-state activity measurements were carried out as described under ”Materials and Methods.“ Syntide 2 concentration was 50 μm, free [Ca2+] concentration was 1.58 μm, and CaM or mutants were used at 6 μm, except for CaM34, which was present at 60 μm concentration and for which [Ca2+] of 100 μm was used. αCaMKII concentration was 50 nm. The panels show CaM1 (●) and CaM2 (■) (A); CaM3 (▾) and CaM4 (♦) (B); CaM12 (*), CaM34 (), and wild type CaM (▴) (C). The error bars represent the S.D. from three sets of data.