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Protein kinase C catalyzes phosphorylation of purified rat brain guanylate cyclase. The phosphorylation is marked by concomitant increase in guanylate cyclase activity. TPA further enhances both phosphorylation and activity of guanylate cyclase. Data seem to provide clues to the molecular mechanism of one of the transformation-like responses mimicked by 12-O-tetradecanoylphorbol-13-acetate, i.e. the elevation of cyclic GMP. It is envisaged that protein kinase C may have a central role in the understanding of molecular events triggering carcinogenesis.
Zwiller et al. (Fri,) studied this question.