| Assay Method Information | |
| | Enzyme Inhibition Assay |
| Description: | Quantitation of BPL catalysed 3H-biotin incorporation into the biotin domain substrate was performed as previously described by Polyak et al, J. Biol. Chem (1999) 274(46) 32847-54. Briefly, the reaction mixture contained: 50 mM Tris HCl pH 8.0, 3 mM ATP, 4.5 uM biotin, 0.5 uM 3H-biotin, 5.5 mM MgCl2, 100 mM KCl, 0.1 mg/mL BSA and 10 uM biotin domain of S. aureus pyruvate carboxylase. The reaction was initiated by the addition of BPL to a final concentration of 4 nM. After 20 minutes at 37 C., 4 uL aliquots of the reaction were spotted onto Whatman paper pre-treated with biotin and trichloroacetic acid. The filters were washed twice with 10% v/v ice-cold trichloroacetic acid and once with ethanol before air-drying. Quantitation of protein-bound radiolabelled biotin was performed by liquid scintillation. One unit of enzyme activity was defined by the amount of BPL required to incorporate 1 nmol of biotin per minute. The IC50 value of each compound was determined. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |