title: Characterization of the interaction of 5'-p-fluorosulfonylbenzoyl adenosine with the epidermal growth factor receptor/protein kinase in A431 cell membranes.
abstract: Treatment of membrane vesicles from A431 cells, a human epidermoid carcinoma line, with the affinity label 5'-p-fluorosulfonylbenzoyl [8-14C]adenosine (5'-p-FSO2Bz[14C]Ado) results in an inhibition of the epidermal growth factor (EGF)-stimulable protein kinase and in the modification of proteins having the same molecular weight (Mr = 170,000 and 150,000) as the receptor for EGF (Buhrow, S. A., Cohen, S., and Staros, J. V. (1982) J. Biol. Chem. 257, 4019-4022). Modification of the vesicles with 5'-p-FSO2BzAdo inhibits not only the EGF-stimulated phosphorylation of endogenous membrane proteins but also the EGF-stimulated phosphorylation of an exogenous synthetic tyrosine-containing peptide substrate. This indicates that the EGF-stimulable protein kinase is modified by 5'-p-FSO2BzAdo at a site affecting catalytic activity. Membrane vesicles were treated with 5'-p-FSO2Bz-[14C]Ado to affinity label the kinase, then the EGF receptor was purified by affinity chromatography on immobilized EGF. The EGF receptor thus purified contains the 5'-p-SO2Bz[14C]Ado moiety. These data strongly support our hypothesis that the EGF receptor and EGF-stimulable kinase are two parts of the same polypeptide chain.
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000345:Affinity Labels / Q000494:pharmacology*; D000818:Animals; D002294:Carcinoma, Squamous Cell; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D004815:Epidermal Growth Factor / Q000378:metabolism*; D066246:ErbB Receptors; D008970:Molecular Weight; D011494:Protein Kinases / Q000378:metabolism*; D051381:Rats; D011956:Receptors, Cell Surface / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D000345:Affinity Labels; D011956:Receptors, Cell Surface; D004815:Epidermal Growth Factor; C010959:5'-(4-fluorosulfonylbenzoyl)adenosine; D011494:Protein Kinases; D066246:ErbB Receptors; D000241:Adenosine