Abstract
Receptor-mediated activation of both adenylate cyclase and phosphatidylinositide hydrolysis systems occurs through guanine nucleotide regulatory proteins and ultimately leads to specific activation of either cyclic AMP-dependent protein kinase A or Ca2+/phospholipid-dependent protein kinase C1,2. Given the remarkable diversity of agents that influence cellular metabolism through these pathways and the similarities of their components, interactions between the two signalling systems could occur. In fact, stimulation of cells with 12-O-tetradecanoyl phorbol-13-acetate (TPA), a phorbol ester that activates protein kinase C3,4, influences hormone-sensitive adenylate cyclase. In some cells TPA induces desensitization of receptor-mediated stimulation of adenylate cyclase5,6, whereas in others, such as frog erythrocytes, phorbol ester treatment results in increased agonist-stimulated as well as basal, guanine nucleotide- and fluoride ion-stimulated adenylate cyclase activities7,8. We show here that TPA produces phosphorylation of the catalytic unit of adenylate cyclase in frog erythrocytes. Moreover, purified protein kinase C can directly phosphorylate in vitro the catalytic unit of adenylate cyclase purified from bovine brain. These results suggest that phosphorylation of the catalytic unit of adenylate cyclase by protein kinase C may be involved in the phorbol ester-induced enhancement of adenylate cyclase activity. In addition to providing the first direct demonstration of a covalent modification of the catalytic unit of adenylate cyclase, these results provide a potential biochemical mechanism for a regulatory link between the two major transmembrane signalling systems.
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Yoshimasa, T., Sibley, D., Bouvier, M. et al. Cross-talk between cellular signalling pathways suggested by phorbol-ester-induced adenylate cyclase phosphorylation. Nature 327, 67–70 (1987). https://doi.org/10.1038/327067a0
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DOI: https://doi.org/10.1038/327067a0
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