Evidence for a three-iron center in a ferredoxin from Desulfovibrio gigas. Mossbauer and EPR studies
- Citation:
- Evidence for a three-iron center in a ferredoxin from Desulfovibrio gigas. Mossbauer and EPR studies, Huynh, B. H., Moura J. J., Moura I., Kent T. A., Legall J., Xavier A. V., and Munck E. , J Biol Chem, Apr 25, Volume 255, Number 8, p.3242-4, (1980)
Abstract:
The tetrameric form of a Desulfovibrio gigas ferredoxin, named Fd II, mediates electron transfer between cytochrome c3 and sulfite reductase. We have studied two stable oxidation states of this protein with Mossbauer spectroscopy and electron paramagnetic resonance. We found 3 iron atoms/monomer and a spin concentration of 0.9 spins/monomer for the oxidized protein. Taken together, the EPR and Mossbauer data demonstrate conclusively the presence of a spin-coupled structure containing 3 iron atoms and labile sulfur. The Mossbauer data show also that this metal center is structurally similar, if not identical, with the low potential center of a ferredoxin from Azotobacter vinelandii, a novel cluster described recently (Emptage, M.H., Kent, T.A., Huynh, B.H., Rawlings, J., Orme-Johnson, W.H., and Munck, E. (1980) J. Biol. Chem. 255, 1793-1796).
Notes:
0021-9258 (Print)0021-9258 (Linking)Journal ArticleResearch Support, U.S. Gov't, Non-P.H.S.Research Support, U.S. Gov't, P.H.S.
