Figure 8.
Models of the Camui sensor for both individual subunits and an assembled holoenzyme. (A) FRET is expected to occur between the fluorophore pair of an inactive subunit. The conformational shift associated with CaMKII activation (ex. via CaM binding) should largely abolish fluorescence transfer. (B) The geometry of the holoenzyme suggests the possibility that intersubunit FRET may occur between fluorophores from adjacent subunits.