Figure 3: Secondary structure and sequence alignment of NOS ... Six independent views of the NOS heme group are reported here. All six models of the heme have a similar curved shape.

Binding of CO to the heme groups of CooA leads to the transcription of genes involved in CO oxidation in Rhodospirillum rubrum. The 2.6 Å structure of reduced (Fe 2+) CooA reveals that His 77 in ...