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Inhibitory effect of bovine brain calmodulin on calmodulin-dependent stimulation of plasma membrane-bound guanylate cyclase in Tetrahymena pyriformis.

Bovine brain calmodulin (B-CaM) was shown to inhibit the native Tetrahymena calmodulin (T-CaM)-dependent activation of guanylate cyclase in Tetrahymena at the concentrations that failed to affect the basal enzyme activity. The enzyme inhibition was completely reversed by high concentration of T-CaM, but not by Ca2+. The antagonistic interaction between T-CaM and B-CaM was not observed in the calmodulin-dependent cyclic nucleotide phosphodiesterase from bovine brain. Two calmodulins migrated independently on 15% polyacrylamide gel system. These results suggest that B-CaM exerts its inhibitory effect on the guanylate cyclase activation by interacting with the calmodulin-binding site of this enzyme.