Figure 1.

(A) Ribbon drawing of R. rubrum CODH monomer. The N-terminal helical domain is in red and the α/β Rossmann domains are in green and blue. The C-, B-, and D-clusters are in space-filling representations with Fe atoms in white, S in yellow, and the M_b site in orange (see Scheme S1). It should be noted that although the entire bridging D-cluster is shown, only half of the cluster is coordinated by each monomer. All figures were made by using RIBBONS (34). (B) Topology diagram of CODH with same domain coloring as shown in A. The positions of the metalloclusters are shown as yellow circles.