Abstract:We have examined the phosphorylation of the cyclic adenosine 3':5' monophosphate (cAMP) cell surface chemotactic receptor and a 36 kDa membrane-associated protein (p36) in Dictyostelium discoideum. The activity of CAR-kinase, the enzyme responsible for the phosphorylation of the cAMP receptor, was studied in plasma membrane preparations. It was found that, as in intact cells, the receptor was rapidly phosphorylated in membranes incubated with [gamma 32P] adenosine triphosphate (ATP) but only in the presence of… Show more
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