ATPase, especially the Ca2$-dependent enzyme, in the chromatin fraction isolated from nuclei of pea seedlings was activated by bovine brain calmodulin and by protein that was judged to be calmodulin from its Ca2$-dependent activation of NAD kinase. This calmodulin-dependent ATPase activity was blocked by calmodulin-specific inhibitors.
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Matsumoto et al. (1984) studied this question.