| Assay Method Information | |
| | SOS1 Catalyzed Nucleotide Exchange Assay |
| Description: | HIS-KRAS (G12C, aa 2-185, Sino biological) was diluted to 5 μM in EDTA buffer (20 mM HEPES, pH 7.4, 50 mM NaCl, 10 mM EDTA, 0.01% (v/v) Tween-20) and incubated for 30 min at 25° C. The EDTA pretreated HIS-KRAS (G12C) was diluted to 12 nM in assay buffer (25 mM HEPES, pH 7.4, 120 mM NaCl, 5 mM MgCl2, 1 mM DTT, 0.01% (v/v) Tween 20, 0.1% (w/v) BSA) containing 120 nM GDP (Sigma) and MAb Anti 6HIS-Tb cryptate Gold (Cisbio) and incubated for 1 hour at 25° C. to prepare GDP-loaded HIS-KRAS (G12C). The GDP-loaded HIS-KRAS (G12C) was pre-incubation with diluted compounds in a 384-well plate (Greiner) for 1 hour, then purified SOS1 ExD (Flag tag, aa 564-1049) and BODIPY™ FL GTP (Invitrogen) were added to the assay wells (Final concentration: 3 nM HIS-KRAS (G12C), 2 μM SOS1 ExD, 80 nM BODIPY™ FL GTP, 21 ng/mL MAb Anti 6HIS-Tb cryptate Gold) and incubated for 4 hours at 25° C. TR-FRET signals were then read on Tecan Spark multimode microplate reader. The parameters were F486: Excitation 340 nm, Emission 486 nm, Lag time 100 μs, Integration time 200 μs; F515: Excitation 340 nm, Emission 515 nm, Lag time 100 μs, Integration time 200 μs. TR-FRET ratios for each individual wells were calculated by equation: TR-FRET ratio=(Signal F515/Signal F486)*10000. Then the data were analyzed using a 4-parameter logistic model to calculate IC50 values. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |