Spectroscopic Characterization of Hemerythrin

Earlier EPR studies were also extended to the nitrosyl adducts of deoxyhe-merythrin since the NO adduct is believed to be a reasonable mimic of the superoxide intermediate expected to be formed upon reaction of hemerythrin wifli O2 [92,93,95,526] The spin-Hamiltonian parameters for the Fe - FeNO unit of NO-deoxyhmerythrin are consistent with antiferromagnetic coupling between the two iron centers, and the coordination of NO to the five-coordinate Fe2, as expected for dioxygen binding. 

EPR spectroscopy has played an important part in the characterization of the iron active site of hemerythrin, and in combination with various other spectro- 

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