title: Nonfunctional epidermal growth factor receptor in cells transformed by Kirsten sarcoma virus.
abstract: The cell membrane receptor for epidermal growth factor (EGF) appears to be a glycoprotein of Mr 170,000 and mediates the mitogenic and metabolic responses of cells with EGF receptors (EGF-R). Normal rat kidney (NRK) have about 3 X 10(5) EGF-R per cell. Upon transformation of NRK cells by Kirsten sarcoma virus, the transformed derivative (KNRK) loses the ability to bind 125I-EGF. Membranes from NRK and KNRK cells were included in EGF-dependent phosphorylation reactions to search for evidence of the EGF-R. A phosphorylated protein of Mr 170,000 was detected in both NRK and KNRK membranes. The Mr 170,000 protein was identified to be EGF-R by immunoprecipitation with monoclonal antibody to the receptor. Furthermore, two-dimensional peptide mapping using trypsin and chymotrypsin digestions of the iodinated receptors from both NRK and KNRK cells showed essentially identical patterns. These data indicate that the EGF-R is present in KNRK cells with apparently the same protein structure as the NRK counterpart.
mesh_terms: D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D002471:Cell Transformation, Neoplastic; D004815:Epidermal Growth Factor / Q000378:metabolism*; D066246:ErbB Receptors; D007668:Kidney; D007700:Kinetics; D007708:Kirsten murine sarcoma virus / Q000235:genetics*; D008970:Molecular Weight; D009955:Ornithine Decarboxylase / Q000378:metabolism; D010446:Peptide Fragments / Q000032:analysis; D051381:Rats; D011956:Receptors, Cell Surface / Q000302:isolation & purification / Q000378:metabolism*; D009053:Sarcoma Viruses, Murine / Q000235:genetics*
chemical_list: D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D009955:Ornithine Decarboxylase