Abstract
Evidence is presented that phosphopeptides produced by tryptic digestion of phosphorylated pyruvate dehydrogenase are effective substrates for pyruvate dehydrogenase phosphatase and that the dephosphopeptides can serve as substrates for pyruvate dehydrogenase kinase. These findings indicate that the phosphatase and the kinase do not require an intact tertiary structure in pyruvate dehydrogenase, but apparently recognize components of the local primary sequence around the phosphorylation sites.
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