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Phosphorylation of tyrosine aminotransferase in vivo.

Abstract Incorporation of 32Pi into hepatic tyrosine aminotransferase (l-tyrosine:2-oxoglutarate aminotransferase; EC 2.6.1.5) was observed when the isotope was either administered into rats or added to the medium of cultured Reuber H-35 hepatoma cells. O-[32P]Phosphoserine was identified in aminotransferase subunits isolated by sodium dodecyl sulfate polyacrylamide gel electrophoresis of immunoprecipitates. Treatment of partially purified 32P-labeled aminotransferase with alkaline phosphatase had no effect on aminotransferase activity assayed in the presence of excess pyridoxal phosphate, but did greatly reduce the amount of phosphate present in the aminotransferase.