| Literature DB >> 6245073 |
B H Huynh, J J Moura, I Moura, T A Kent, J LeGall, A V Xavier, E Münck.
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 Mössbauer 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 Mössbauer data demonstrate conclusively the presence of a spin-coupled structure containing 3 iron atoms and labile sulfur. The Mössbauer 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 Münck, E. (1980) J. Biol. Chem. 255, 1793-1796).Entities:
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Year: 1980 PMID： 6245073
Source DB: PubMed Journal: J Biol Chem ISSN： 0021-9258 Impact factor: 5.157