title: Kinetic evidence that 1,2-diolein inhibits phorbol ester binding to protein kinase C via a competitive mechanism.
abstract: Diacylglycerols inhibit binding of [20-3H]phorbol 12,13-dibutyrate ([3H]PDBu) to protein kinase C (the phorbol ester receptor). This inhibition could reflect competitive binding by the diglyceride. Alternatively, it might simply represent perturbation of the lipid environment required for binding activity. As predicted for a competitive mechanism, we report here that inhibitory concentrations of the diglyceride 1,2-diolein do not affect the off-rate of [3H]PDBu from its receptor. This behavior contrasts with that of arachidonic acid, which appears to interact via a mixed mechanism.
mesh_terms: D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000494:pharmacology; D001667:Binding, Competitive; D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins; D004075:Diglycerides / Q000494:pharmacology*; D005989:Glycerides / Q000494:pharmacology*; D007700:Kinetics; D015240:Phorbol 12,13-Dibutyrate; D010703:Phorbol Esters / Q000378:metabolism*; D011493:Protein Kinase C / Q000378:metabolism*; D011955:Receptors, Drug; D011971:Receptors, Immunologic / Q000187:drug effects*
chemical_list: D001095:Arachidonic Acids; D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins; D004075:Diglycerides; D005989:Glycerides; D010703:Phorbol Esters; D011955:Receptors, Drug; D011971:Receptors, Immunologic; C083141:phorbol ester binding protein; C027776:phorbol ester receptor; D016718:Arachidonic Acid; D015240:Phorbol 12,13-Dibutyrate; D011493:Protein Kinase C; C013965:diolein