Abstract
Endogenous protein phosphorylation in plasma membranes isolated from SV 40-transformed mouse fibroblasts was studied in the presence and absence of cyclic nucleotides. Using low concentrations of membrane protein the kinetics of ATP-dependent 32P-incorporation showed a rapid phosphorylation reaction up to 2 sec of incubation which was stimulated by cAMP and inhibited by cGMP. This short-time phosphorylation reaction was followed by a rapid dephosphorylation and a slower rephosphorylation. This phenomenon was dependent on protein concentration.
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More From: Biochemical and Biophysical Research Communications
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