Inhibition of human ACC2 using acetyl-CoA as substrate assessed as [14C]malonyl-CoA synthesis preincubated for 10 mins prior to substrate addition measured after 20 mins by liquid scintillation counting analysis in presence of NaH[14C]O3
Inhibition of human ACC1 using acetyl-CoA as substrate assessed as [14C]malonyl-CoA synthesis preincubated for 10 mins prior to substrate addition measured after 20 mins by liquid scintillation counting analysis in presence of NaH[14C]O3
Inhibition Assay: Preparation of rhACC1. Two liters of SF9 cells, infected with recombinant baculovirus containing full length human ACC1 cDNA, were suspended in ice-cold lysis buffer (25 mM Tris, pH 7.5; 150 mM NaCl; 10% glycerol; 5 mM imidazole (EMD Bioscience; Gibbstown, N.J.); 2 mM TCEP (BioVectra; Charlottetown, Canada); Benzonase nuclease (10000 U/100 g cell paste; Novagen; Madison, Wis.); EDTA-free protease inhibitor cocktail (1 tab/50 mL; Roche Diagnostics; Mannheim, Germany). Cells were lysed by 3 cycles of freeze-thaw and centrifuged at 40,000xg for 40 minutes (4 C.). Supernatant was directly loaded onto a HisTrap FF crude column (GE Healthcare; Piscataway, N.J.) and eluted with an imidazole gradient up to 0.5 M over 20 column volumes (CV). ACC1-containing fractions were pooled and diluted 1:5 with 25 mM Tris, pH 7.5, 2 mM TCEP, 10% glycerol and direct loaded onto a CaptoQ (GE Healthcare) column and eluted with an NaCl gradient up to 1 M over 20 CV's.
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.