Abstract
Calmodulin-dependent NAD kinase has been purified more than 70fold from a crude plant (zucchini squash) homogenate by calmodulin-Sepharose affinity chromatography to a specific activity of 80 munits/mg protein. The enzyme could be activated about 8fold by calmodulin. Half-maximal activation was obtained with 6 ng of purified calmodulin from bovine brain. Together with NAD kinase other soluble plant proteins were retained specifically on the column. NaDodSo4 polyacrylamide gel electrophoresis of the proteins which were retained by the calmodulin-Sepharose column revealed at least 7 to 8 bands. Most of the intensively stained bands on the gels obtained from the crude homogenate had disappeared.
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