Assay Report Card

ID: ALA3706109

Type: Binding

Description: Fluorescence Polarisation Assay: In a black, 384-well polystyrene assay plate, 30 microliters/well of 5 nM Escherichia coli DNA gyrase A/B tetramer and 130 micrograms/ml of topologically relaxed plasmid containing the triplex-forming sequence TTCTTCTTCTTCTTCTTCTTCTTCTTC in an assay buffer consisting of 35 mM Tris-HCl (pH 7.5), 24 mM KCl, 4 mM MgCl2, 2 mM dithiothreitol, 1.8 mM spermidine, 5% (v/v) glycerol, 200 nM bovine serum albumin, 0.8% dimethylsulfoxide, and 0.3 mM ATP may be incubated at ambient temperature for (typically 30 minutes) in the absence or presence of 5-10 different concentrations of test compound. The supercoiling reactions may be quenched by the addition of 10 microliters/well of 40 nM oligodeoxynucleotide probe in 3x triplex-forming buffer consisting of 150 mM NaCl, and 150 mM sodium acetate at pH 3.5. The oligodeoxynucleotide probe may be 5x-BODIPY-FL-labeled TTCTTCTTC. After 60 minutes, the fluorescence anisotropy of the BODIPY-FL may be measured in a Tecan Ultra plate reader, using 485 nM.

Organism: Escherichia coli