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  • Title: Iron-sulphur cluster composition and redox properties of two ferredoxins from Desulfovibrio desulfuricans Norway strain.
    Author: Guerlesquin F, Moura JJ, Cammack R.
    Journal: Biochim Biophys Acta; 1982 Mar 16; 679(3):422-7. PubMed ID: 6279148.
    Abstract:
    Two ferredoxins from Desulfovibrio desulfuricans, Norway Strain, were investigated by EPR spectroscopy. Ferredoxin I appears to be a conventional [4Fe-4S]2+;1+ ferredoxin, with a midpoint reduction potential of -374 mV at pH 8. Ferredoxin II when reduced, at first showed a more complex spectrum, indicating an interaction between two [4Fe-4S] clusters, and probably, has two clusters per protein subunit. Upon reductive titration ferredoxin II changed to give a spectrum in which no intercluster interaction was seen. The midpoint potentials of the native and modified ferredoxin at pH 8 were estimated to be -500 and -440 mV, respectively.
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