Figure 3. Structure of the CaMBD–Ca²⁺–CaM complex.

A, ribbon diagram of the CaMBD–Ca²⁺–CaM dimeric complex. CaMBD subunits are in blue and yellow, CaM molecules are in green and the Ca²⁺ ions are in red. Secondary structural elements, the CaM linker and the first and last observed residues in the CaMBD are labelled. B, the view is rotated 90°, showing the orientation of the complex relative to the membrane. Arrow indicates the positions of the first observed residue of each of the CaMBD monomers that are linked to the S6 pore helices. (Reproduced with permission from: Schumacher et al. 2001.)