The probable binding between cations and stimulatory protein kinase modulator and subsequent stimulation on cerebellar modulator-dependent protein kinases.

The formation of complexes between cations and stimulatory protein kinase modulator (PKMs) were performed by preincubation and gel filtration. The stimulatory effects of Fe3+, Fe2+, Mg2+, and Co2+ complexes on cerebellar modulator-dependent protein kinases (M-PK) were similar to those without preformation of complexes by preincubation and gel filtration. Antagonism by Ca2+ on the stimulatory effect of Mg2+ was noted in spite of the ineffectiveness of Ca2+ when present alone.