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DNA topoisomerase IV, the ParC-ParE complex, can relax DNA, turning supercoiled DNA into its relaxed form.
Kit Components
| Component | T4RA-100KP |
|---|---|
| 10 x Buffer | 480 µl |
| 10 x Supercoiled plasmid DNA | 405 µl |
| 100 x P. aeruginosa topoisomerase IV | 45 µl |
| 10 mM ATP | 420 µl |
| 1500 x Fluorescence dye H19 | 20 µl |
Final reaction conditions: 20 mM Tris-HCl pH 8, 35 mM NH4OAc, 4.6% glycerol, 1 mM DTT, 0.005% Brij35, 8 mM MgCl2, 25 µg/ml supercoiled plasmid DNA, 1 mM ATP and 100 nM topoisomerase IV.
Assay Principle
In the presence of magnesium, relaxed DNA quenches the fluorescence of DNA dye H19 much more than supercoiled DNA does. As topoisomerase IV relaxes the supercoiled plasmid, the fluorescent signal (Ex 485 nm / Em 535 nm) decreases.
Specifications
| Assay Target | P. aeruginosa Topo IV DNA relaxation |
|---|---|
| Target Type | Topoisomerase |
| Organism | P. aeruginosa |
| Assay Type | Enzyme Activity Assay |
| Detection Method | Fluorescence |
| Detection Wavelength | Ex 485 nm / Em 535 nm |
| Plate Format | 96-well plate |
| Instrument Required | Fluorescence microplate reader |
| Assay Time | About 65 min (60 min reaction + 5 min detection) |
| Size | 100 assays |
| Storage | Please contact us to confirm storage conditions. |
| Shipping | Shipped frozen. |
Protocol
The manufacturer's protocol describes the procedure and reaction volumes.
- Topo IV DNA Relaxation Assays (PDF, see Documents): Covers catalog # T4RA-100KP.
Safety & Handling
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