Abstract
An activator protein of NAD kinase from the pea, Pisum satavum L., has been shown to be Ca 2+-dependent. This plant activator protein also stimulates the activity of modulator protein dependent-cyclic nucleotide phosphodiesterase from porcine brain. This stimulation is similar to that observed with modulator protein isolated from animal sources. Furthermore, Ca 2+-dependent modulator proteins isolated from porcine brain, bovine brain, and the coelenterate, Renilla , will regulate the NAD kinase activity of peas. Other common properties of the plant activator protein and animal modulator proteins are their acidic nature, heat stabilities, similar Stokes' radii, and their interactions with troponin I.
Published Version
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