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The nature and role of nonheme iron proteins which participate in a variety of biological oxidations has recently come under intensive scrutiny. Such study received considerable impetus from the discovery and characterization of ferredoxins. 1-3 During the isolation of ferredoxin a red protein has been observed in extracts of Clostridium pasteurianum.4' 5 We have now isolated this protein in crystalline form and tentatively named it rubredoxin.6 It is a small nonheme iron protein which can substitute for ferredoxin as an electron carrier in several reactions mediated by extracts of C. pasteurianum. Rubredoxin differs from the ferredoxins spectrally and chemically. The properties of purified rubredoxin are the subject of this communication.

Rubredoxin: a new electron transfer protein from Clostridium pasteurianum.