Site-directed mutations of the 4Fe-ferredoxin from the hyperthermophilic archaeon Pyrococcus furiosus: role of the cluster-coordinating aspartate in physiological electron transfer reactions.

Abstract excerpt

Ferredoxin from the hyperthermophilic archaeon Pyrococcus furiosus is a monomeric protein (7.5 kDa) that contains a single [4Fe-4S]1+, 2+ cluster. The protein is unusual in that its cluster is coordinated by three Cys and one Asp residue, rather than by the typical four Cys residues. Site-directed mutagenesis has been used to obtain mutant forms in which the cluster-coordinating Asp was replaced by Cys (D14C) and...

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