The isolation of acetyl-CoA carboxylase from lactating rat mammary glands is described. A procedure was used which differs significantly from those employed by others who have isolated this enzyme from animal tissues. The purified enzyme catalyzes the carboxylation of 5.5 pmoles of acetylCoA per min per mg of protein under optimum assay conditions. Apparent K, values were determined for acetyl-...

ATP:citrate lyase (ACL) catalyzes the conversion of citrate to acetyl-coenzyme A (CoA) and oxaloacetate and is a key enzyme for lipid accumulation in mammals and oleaginous yeasts and fungi. To investigate whether heterologous ACL genes can be targeted and imported into the plastids of plants, a gene encoding a fusion protein of the rat liver ACL with the transit peptide for the small subunit o...

The protomeric form of purified acetyl coenzyme A carboxylase is inactivated by the binding of avidin to the biotinyl prosthetic group; the catalytically active filamentous form of the enzyme is resistant to avidin. This differential sensitivity to avidin was used to examine the influence of nutritional state on the proportion of polymeric and protomeric carboxylase occurring in avian liver. He...

Abbreviations: acetyl-CoA carboxylase (ACC); acetyl-CoA synthetase (AceCS); carnitine palmitoyltransferase I (CPT-I); chenodeoxycholic acid (CDCA); cholesterol 7 hydroxylase (CYP7A1); cholic acid (CA); farnesoid X receptor (FXR); fatty acid synthase (FAS); LDL receptor (LDL-R); INT-747, 6ethyl-CDCA; liver X receptor (LXR; long-chain acyl-CoA dehydrogenase (LCAD); malic enzyme (ME); medium-chain...

In comparing the specific activity of enzymes pertaining to the biosynthesis of fatty acids in crude extracts of cultivated M. lepraemurium and M. smegmatis, it was found that: 1. The activity of acetyl CoA carboxylase of the former organism was undetectable and that of de novo fatty acid synthetase was too weak to measure exactly, under the condition used, whereas both activities of the latter...

The single polypeptide chain of Bacillus thermodenitrificans pyruvate carboxylase (PC) is composed of the biotin carboxylase (BC), carboxyl transferase (CT) and biotin carboxyl carrier protein (BCCP) domains from the amino terminus. This polypeptide chain was divided into two between the CT and BCCP domains. The resulting proteins, PC-(BC + CT) and PC-(BCCP), were expressed in Escherichia coli ...

The time-dependent loss of enzymic activity and tetrameric structure of chicken liver pyruvate carboxylase (EC 6.4.1.1) after dilution below 2 units/ml was apparently monophasic and first-order. When examined over a range of initial enzyme concentrations, both activity and tetrameric structure decayed to equilibrium levels which were dependent on the initial concentration. The observed rate con...

The effect of the three cyclohexane-1,3-dione derivatives cycloxydim, sethoxydim and clethodim on the incorpora­ tion of l4C-labelled acetate, malonate, acetyl-CoA or malonyl-CoA into fatty acids was studied in an enzyme preparation isolated from barley chloroplasts (H ordeum vulgare L. var. “A lexis”). The herbicides cycloxydim, clethodim and sethoxydim block the de novo fatty acid biosynthesi...

Chemical genetic studies on acetyl-CoA carboxylases (ACCs), rate-limiting enzymes in long chain fatty acid biosynthesis, have greatly advanced the understanding of their biochemistry and molecular biology and promoted the use of ACCs as targets for herbicides in agriculture and for development of drugs for diabetes, obesity and cancers. In mammals, ACCs have both biotin carboxylase (BC) and car...