Luminometric Assay: The reaction mixture contained 50 mM tris acetate (Merck, #1.08382.1000), pH 7.5, 250 μM acetyl coenzyme A (Sigma, #A2181),16 mM NaHCO3 (Merck, #1.06329.0500), 0.9 mg/ml bovine serum albumin (Sigma, #A8806), 25 μM ATP (Sigma, #A7699), 1.1 μM β-mercaptoethanol (Roth, #4227,1), 4.3 mM magnesium acetate ((Merck, #1.05819.0250), 10 mM sodium citrate (Merck, #1.06448.0500) and 200-400 ng of the ACC preparations. The mixture also contained a test compound. The test compounds were each dissolved in 10 mM DMSO and were assayed at final concentrations of 0 μM, 0.01 μM, 0.03 μM, 0.1 μM, 0.3 μM, 1 μM, 3 μM, 10 μM, 30 μM and 100 μM. The final concentration of the DMSO in the assay was 0.1% (v/v). The reaction was started by adding ACC and was carried out at 37° C. for 90 min. The reaction was then stopped by adding 150 μl of 0.5 M tris acetate. 10 μl of the mixture were removed and mixed with 90 μl of ATP monitoring reagent (Cambrex, #LT27-002). After incubation for 10 min, the luminescence was measured in a luminometer (Tecan Genios Pro).
Spectrophotometric 384 Well Assay: Malonyl CoA formation by acetyl CoA carboxylases is stoichometrically linked to the consumption of ATP. ACC2 activity is measured in a NADH-linked kinetic method measuring ADP generated during the ACC reaction using a coupled lactate dehydrogenase/pyruvate kinase reaction. For biological testing, a human ACC2 construct which lacks the 128 amino acids at the N-terminus for increased solubility (nt 385-6966 in Genbank entry AJ575592) is cloned. The protein is then expressed in insect cells using a baculoviral expression system. Protein purification is performed by anion exchange.
Spectrophotometric 384 Well Assay: Malonyl CoA formation by acetyl CoA carboxylases is stoichometrically linked to the consumption of ATP. ACC2 activity is measured in a NADH-linked kinetic method measuring ADP generated during the ACC reaction using a coupled lactate dehydrogenase/pyruvate kinase reaction.For biological testing, a human ACC2 construct which lacks the 128 amino acids at the N-terminus for increased solubility (nt 385-6966 in Genbank entry AJ575592) is cloned. The protein is then expressed in insect cells using a baculoviral expression system. Protein purification is performed by anion exchange.All compounds are dissolved in dimethyl sulfoxide (DMSO) to a concentration of 10 mM.Assay reactions are then carried out in 384-well plates, with hACC2 in an appropriate dilution and at final assay concentrations (f.c.) of 100 mM Tris (pH 7.5), 10 mM trisodium citrate, 25 mM KHCO3, 10 mM MgCl2, 0.5 mg/ml BSA, 3.75 mM reduced L-glutathione, 15 U/ml lactate dehydrogenase, 0.5 mM phosphoenolpyruvate.
Spectrophotometric 384 Well Assay: Malonyl CoA formation by acetyl CoA carboxylases is stoichometrically linked to the consumption of ATP. ACC2 activity is measured in a NADH-linked kinetic method measuring ADP generated during the ACC reaction using a coupled lactate dehydrogenase/pyruvate kinase reaction.For biological testing, a human ACC2 construct which lacks the 128 amino acids at the N-terminus for increased solubility (nt 385-6966 in Genbank entry AJ575592) is cloned. The protein is then expressed in insect cells using a baculoviral expression system. Protein purification is performed by anion exchange.All compounds are dissolved in dimethyl sulfoxide (DMSO) to a concentration of 10 mM.Assay reactions are then carried out in 384-well plates, with hACC2 in an appropriate dilution and at final assay concentrations (f.c.) of 100 mM Tris (pH 7.5), 10 mM trisodium citrate, 25 mM KHCO3, 10 mM MgCl2, 0.5 mg/ml BSA, 3.75 mM reduced L-glutathione, 15 U/ml lactate dehydrogenase, 0.5 mM phosphoenolpyruvate.
Inhibition Assay: Preparation of rhACC2. Human ACC2 inhibition was measured using purified recombinant human ACC2 (hrACC2). Briefly, a full length Cytomax clone of ACC2 was purchased from Cambridge Bioscience Limited and was sequenced and subcloned into PCDNA5 FRT TO-TOPO (Invitrogen, Carlsbad, Calif.). The ACC2 was expressed in CHO cells by tetracycline induction and harvested in 5 liters of DMEM/F12 with glutamine, biotin, hygromycin and blasticidin with 1 ug/mL tetracycline (Invitrogen, Carlsbad, Calif.). The conditioned medium containing ACC2 was then applied to a Softlink Soft Release Avidin column (Promega, Madison, Wis.) and eluted with 5 mM biotin. 4 mgs of ACC2 were eluted at a concentration of 0.05 mg/mL (determined by A280) with an estimated purity of 95% (determined by A280). The purified ACC2 was dialyzed in 50 mM Tris, 200 mM NaCl, 4 mM DTT, 2 mM EDTA, and 5% glycerol. The pooled protein was frozen and stored at -80 C., with no loss of activity upon thawing.
Spectrophotometric 384 Well Assay: Malonyl CoA formation by acetyl CoA carboxylases is stoichometrically linked to the consumption of ATP. ACC2 activity is measured in a NADH-linked kinetic method measuring ADP generated during the ACC reaction using a coupled lactate dehydrogenase/pyruvate kinase reaction.For biological testing, a human ACC2 construct which lacks the 128 amino acids at the N-terminus for increased solubility (nt 385-6966 in Genbank entry AJ575592) is cloned. The protein is then expressed in insect cells using a baculoviral expression system. Protein purification is performed by anion exchange.All compounds are dissolved in dimethyl sulfoxide (DMSO) to a concentration of 10 mM.Assay reactions are then carried out in 384-well plates, with hACC2 in an appropriate dilution and at final assay concentrations (f.c.) of 100 mM Tris (pH 7.5), 10 mM trisodium citrate, 25 mM KHCO3, 10 mM MgCl2, 0.5 mg/mL BSA, 3.75 mM reduced L-glutathione, 15 U/mL lactate dehydrogenase, 0.5 mM phosphoenolpyruvate.
Inhibition of human recombinant his-tagged ACC2 expressed in baculovirus/Sf9 cell assessed as inorganic phosphate formation preincubated for 15 mins measured after 1.5 hrs by Malachite green reagent method