FIGURE 7.

X-ray structure of MpTsdBA and heme arrangement. A, overall fold with TsdB N-terminal domain (residues 1–193) depicted in blue and TsdA C-terminal domain (residues 240–516) in red; the two shades in each domain represent the respective sub-domains (1–90 and 91–193 for TsdB and 240–377 and 378–516 for TsdA). The heme prosthetic groups are colored by atom type (orange or yellow for carbon, blue for nitrogen, red for oxygen, and dark red for iron). B, Fe-to-Fe distances; C, closest edge-to-edge distances.