Nitric oxide reductase

A functional heme/nonheme nitric oxide reductase (NOR) model is presented. The fully reduced diiron compound reacts with two equivalents of NO leading to the formation of one equivalent of N2O and the bis-ferric product. NO binds to both heme Fe and nonheme Fe complexes forming individual ferrous nitrosyl species. The mixed-valence species with an oxidized heme and a reduced nonheme FeB does not show NO reduction activity. These results are consistent with a so-called “trans” mechanism for the reduction of NO by bacterial NOR.


  • *To whom correspondence should be addressed. E-mail: jpc{at}
  • Author contributions: J.P.C. and Y.Y. designed research; Y.Y., A.D., R.A.D., S.G., and T.O. performed research; Y.Y. contributed new reagents/analytic tools; Y.Y., A.D., R.A.D., S.G., T.O., and E.I.S. analyzed data; and Y.Y. and A.D. wrote the paper.
  • The authors declare no conflict of interest.
  • † The reaction of LFeIII with NO led to the formation of LFeIII-NO, which is characterized by UV-vis, IR, and resonance Raman; no reduction of ferric heme to form heme Fe(II)-NO was observed.

  • © 2008 by The National Academy of Sciences of the USA
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