Ferritin, nitrosyl complexes

Metal storage proteins also form a variety of nitrosyl complexes. Metallothi-onein has been shown to form a low-spin complex with Fe and NO (Kennedy et al., 1993). Ferritin contains multiple iron binding sites capable of forming spectroscopically distinguishable nitrosyl complexes (Lee et al., 1994 LeBrun et al., 1993). 

Lee M, Arosio P et al (1994) Identification of the EPR-active iron-nitrosyl complexes in mammalian ferritins. Biochmiistry 33 3679-3687... 

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