Multiple phosphorylation of acetyl-CoA carboxylase in chick liver cells. A cyclic AMP-independent process.
When chick liver cells in monolayer culture were incubated with 32Pi in the presence of insulin, acetyl-CoA carboxylase became extensively labeled with 32Pi reaching a stoichiometry of 9 to 10 mol of phosphoryl group per mol of 240,000-dalton enzyme subunit. The covalently bound phosphate was found to be metabolically labile, turning over with a t1/2 of approximately 2 h (enzyme t1/2 approximately equal to 24 h). Addition of Bt2cAMP altered neither the rate nor extent of phosphorylation. Contrary to other reports, the fully phosphorylated acetyl-CoA carboxylase appears to be catalytically active.
D000103:Acetyl-CoA Carboxylase / Q000378:metabolism*; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology*; D002478:Cells, Cultured; D002645:Chickens; D003513:Cycloheximide / Q000494:pharmacology; D007700:Kinetics; D008025:Ligases / Q000378:metabolism*; D008099:Liver / Q000201:enzymology*; D008970:Molecular Weight; D011494:Protein Kinases / Q000378:metabolism*
D003994:Bucladesine; D003513:Cycloheximide; D011494:Protein Kinases; D008025:Ligases; D000103:Acetyl-CoA Carboxylase