title: Vasopressin-stimulated phosphorylation of rat liver phospholipid methyltransferase in isolated hepatocytes.
abstract: Addition of vasopressin (1 microM) to isolated rat hepatocytes prelabeled with [32P]phosphate was accompanied by a 250% increase in the phosphorylation of phospholipid methyltransferase. Vasopressin-stimulated phospholipid methyltransferase phosphorylation was time- and dose-dependent. 32P-labeled phospholipid methyltransferase was recovered by immunoprecipitation and SDS-polyacrylamide gel electrophoresis. After electrophoresis, phospholipid methyltransferase was electroeluted from the polyacrylamide gel and subjected to tryptic digestion or HCl hydrolysis. Analysis of 32P-labeled peptides reveals only one site of phosphorylation and the analysis of [32P]phosphoamino acids indicates that phosphoserine is the only labeled amino acid.
mesh_terms: D000818:Animals; D004789:Enzyme Activation / Q000187:drug effects; D066298:In Vitro Techniques; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008780:Methyltransferases / Q000378:metabolism*; D050941:Phosphatidyl-N-Methylethanolamine N-Methyltransferase; D050918:Phosphatidylethanolamine N-Methyltransferase; D010766:Phosphorylation; D010768:Phosphoserine / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D014667:Vasopressins / Q000494:pharmacology*
chemical_list: D014667:Vasopressins; D010768:Phosphoserine; D008780:Methyltransferases; D050918:Phosphatidylethanolamine N-Methyltransferase; D050941:Phosphatidyl-N-Methylethanolamine N-Methyltransferase