| Assay Method Information | |
| | In Vitro OGG1 Activity Assay |
| Description: | OGG1 activity is assayed by measuring the increase in fluorescence from a duplex oligonucleotide containing an OGG1 substrate and a fluorophore in close proximity that are quenched by a quencher on the complementary strand. One single-stranded DNA oligonucleotide with the sequence 5′-FAM-TCTG CCA 8CA CTG CGT CGA CCT G-3′ (SEQ ID NO 1) is annealed to a 25% surplus of 5′-CAG GTC GAC GCA GTG CTG GCA GT-Dab-3′ (SEQ ID NO 2), where 8 signifies 8-oxo-2′deoxyadenosine and FAM and Dab signify fluorescein and dabcyl, respectively. OGG1 activity releases the substrate base from DNA by cleaving the N-glycosidic bond between base and deoxyribose. The resulting apurinic site is cleaved by an excessive amount APEX1 activity which cause the duplex to melt, which in turn cause the fluorophore to become unquenched. Compounds to be tested are dissolved in DMSO and nano-dispensed directly into black 384-well plates, followed by transfer of enzyme and substrate solutions. Enzyme and DNA substrate solutions are added so that the assay mixture contains final concentrations of 25 mM Tris-HCl pH 8.0, 15 mM NaCl, 2 mM MgCl2, 0.5 mM DTT and 0.0025% Tween-20, 800 pM OGG1 enzyme, 2 nM human APEX1 and 10 nM 8-oxoA:C substrate. The fluorescent signal is recorded in a plate reader equipped with suitable filters to register fluorescein fluorescence. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |