The complex of sulfide and methemerythrin has been characterized by resonance Raman spectroscopy. At pH 8.0 the complex contains two irons and one S2- at the active site. The resonance Raman spectrum of the sulfidomethemerythrin complex contains only one vibration, at 444 cm-1. This vibration is assigned to an iron-sulfide stretch. The possibility that sulfidomethemerythrin contains a μ-sulfido bridge, FeIII-S2-FeIII, analogous to the proposed μ-oxo bridge in azidomethemerythrin is discussed.
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