Figure 1.

EncFtn subcomplex architecture. A, annular decamer structure of EncFtn shown in a side-on and top-down view, with a simplified representation of topology. The decamer structure has 10 iron ions bound (orange spheres). B, an EncFtn monomer with a simplified cartoon. C, the FOC dimer in cartoon with two coordinated iron ions (shown as orange spheres), and a simplified FOC cartoon is shown with two iron ions as orange circles. D, the nonFOC dimer with cartoon secondary structure and a simplified representation.