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A calmodulin-binding protein is present in extracts of the macrophage-like mouse cell line J774 and in extracts of thioglycollate-stimulated mouse peritoneal macrophages; it is deficient in variants of J774 resistant to trifluoperazine and in resident peritoneal macrophages. The calmodulin-binding protein [CaMBP (J7)0.5] was purified from J774 and resolved from endogenous cyclic nucleotide phosphodiesterase and protein kinase activities. The protein has an apparent native Mr of 125,000-150,000 and binds calmodulin in a calcium-dependent manner with a Kd of 20 nM. It inhibits the ability of calmodulin to activate phosphodiesterase. Its sedimentation constant in glycerol gradients containing calmodulin was dependent upon the relative concentrations of calmodulin and the calmodulin-binding protein.
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