title: Epidermal growth factor and epidermal growth factor receptor-dependent phosphorylation of a Mr = 34,000 protein substrate for pp60src.
abstract: A Mr = 34,000 protein present in the 100,000 X g supernatant fraction from A431 human epidermoid carcinoma cells is the major radiolabeled phosphate acceptor from [gamma-32P]ATP in a cell-free system requiring epidermal growth factor (EGF) and EGF receptor kinase. This protein is immunoprecipitated by IgG directed against avian Mr = 34,000 cellular substrate for pp60src. Phosphoamino acid analysis of the Mr = 34,000 protein labeled with 32Pi from [gamma-32P]ATP in a cell-free system requiring EGF and EGF receptor kinase yielded radiolabeled phosphotyrosine with no detectable radioactivity in phosphoserine or phosphothreonine.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D004815:Epidermal Growth Factor / Q000378:metabolism*; D066246:ErbB Receptors; D006801:Humans; D008970:Molecular Weight; D009363:Neoplasm Proteins / Q000302:isolation & purification / Q000378:metabolism*; D015688:Oncogene Protein pp60(v-src); D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000378:metabolism*; D014764:Viral Proteins / Q000378:metabolism
chemical_list: D009363:Neoplasm Proteins; D011956:Receptors, Cell Surface; D014764:Viral Proteins; D004815:Epidermal Growth Factor; D011494:Protein Kinases; D066246:ErbB Receptors; D015688:Oncogene Protein pp60(v-src)