Abstract
Stimulation of adrenal chromaffin cells results in a rise in the concentration of intracellular free calcium1–3 which initiates catecholamine secretion by exocytosis4,5. An understanding of the molecular basis of exocytosis will require knowledge of the sites of action of calcium. A role for calmodulin has been implicated in secretion from chromaffin cells6,7, and isolated granule membranes bind both calmodulin8 and a series of cytosolic proteins9–12 in a calcium-dependent fashion. Here, we demonstrate that one of the cytosolic granule-binding proteins with a relative molecular mass (Mr) of 70,000 (70K) is a form of the calmodulin-regulated actin-binding protein caldesmon, first isolated from smooth muscle13. Cytoplasmic gels assembled from an adrenal medullary extract in the absence of Ca2+ contained actin and the 70K protein. The association of both of these proteins with the cytoplasmic gel was inhibited by a micromolar concentration of Ca2+. In addition, we have demonstrated that the 70K protein is localized at the periphery of chromaffin cells. These results are consistent with the notion that 70K protein (caldesmon) has a role in regulating the organization of actin filaments of the cell periphery during the secretory process.
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Burgoyne, R., Cheek, T. & Norman, KM. Identification of a secretory granule-binding protein as caldesmon. Nature 319, 68–70 (1986). https://doi.org/10.1038/319068a0
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DOI: https://doi.org/10.1038/319068a0
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