Figure 4. Inhibition of Gαi1/RGS4 interaction by the cysteine-reactive compound CCG-4986.
A previously identified compound, CCG-4986, (Roman et al., 2007) covalently modifies surface cysteines on RGS4, preventing association with Gαi1 (Kimple et al., 2007). The FRET method allows determination of an IC50 for RGS protein inhibition.