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Abstract The endogenous phosphorylation of protein in various membranous subcellular fractions from rat cerebrum has been studied in vitro. The endogenous phosphorylation of one minor protein component of synaptic membrane fractions showed a marked dependence upon the presence of added adenosine 3',5'-monophosphate (cyclic AMP). The apparent molecular weight of this phosphoprotein was approximately 100,000. Under the experimental conditions used, the selective stimulation of phosphorylation of a membrane protein by cyclic AMP was observed only in those subcellular fractions enriched in synaptic membranes. The results support other evidence suggesting that certain types of synaptic transmission may involve cyclic AMP-dependent phosphorylation of a specific protein constituent of synaptic membranes.
Johnson et al. (Fri,) studied this question.
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