Figure 5 - full size

Figure 5.
Fig. 5. Heme-packing motifs. Superposition of the heme groups of nitrite reductase (gray) and hydroxylamine oxidoreductase (black) numbered according to their attachment to the protein chain. With the exception of the active site heme (1 in NiR, 4 in hydroxylamine oxidoreductase), all heme groups form di-heme elbow motifs ( circles), which are connected via a parallel stacking arrangement similar to the one observed in split-Soret cytochrome c (ovals). Images were produced using Molscript (32).