Figure 8

Fig. 8: The three-dimensional structure of the Wolinella succinogenes fumarate reductase dimer. The polypeptide backbones of the two A subunits are drawn in blue and brown, those of the two B subunits in red and pink and those of the C subunits in green and light blue. The prosthetic groups are displayed as atomic models with C in yellow, N in blue, O in red, P in light green, S in green and Fe in red-brown. The prosthetic groups of one monomer are labelled as heme groups b_B and b_P, and as iron-sulphur centres Fe₃S₄, Fe₄S₄, and Fe₂S₂. Also labelled are the FAD group and the bound substrate fumarate as well as the indicated distances in Å units.