Abstract
Publisher Summary One of the characteristic features in the central metabolic pathways of both anaerobic and aerobic archaea is the involvement in electron transport of ferredoxins. Ferredoxins are simple iron-sulfur proteins with prosthetic groups composed of iron and sulfur atoms and function as intracellular electron carders. The physiological significance of bacterial-type ferredoxins in several aerobic and thermoacidophilic archaea, such as Sulfolobus and Thermoplasma, was first recognized by Kerscher et al ., when it was demonstrated that ferredoxins are an effective electron acceptor of a coenzyme A-acylating 2-oxoacid:ferredoxin oxidoreductase. The most unusual feature of these ferredoxins is the presence of an isolated zinc center, and hence they are called the “zinc-containing ferredoxins.” This chapter focuses on purification and some structural and functional properties of archaeal zinc-containing ferredoxins and several related metalloproteins: 2-oxoacid: ferredoxin oxidoreductase, red iron-sulfur flavoprotein, and sulredoxin.
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