Four-Iron (Sulfide) Ferredoxin from Bacillus polymyxa

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Four-iron (sulfide) ferredoxin from Bacillus polymyxa.

Ferredoxin from Bacillus polymyxa contains (per mole) four non-heme iron residues, four acid-labile sulfide residues, and four cysteine residues. Its molecular weight is approximately 8,800, and it has an oxidation-reduction potential (E(m)) of -390 mv. It is active as an electron carrier in several ferredoxin-linked enzyme systems.

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Proton magnetic resonance and magnetic susceptibility characterization of ferredoxin I from Bacillus polymyxa.

Magnetic susceptibility and proton magnetic resonance spectra are reported for the oxidized and reduced forms of the iron-sulfur protein Bacillus polymyxa ferredoxin I. The magnetic susceptibility of the oxidized form indicates antiferromagnetic exchange coupling between component iron atoms that is quantitatively similar to that observed for the clostridial ferredoxins and for the [(C(2)H(5))(...

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Ferredoxins from Bacillus polymyxa. Low potential iron-sulfur proteins which appear to contain single four iron, four sulfur centers accepting a single electron on reduction.

Two iron-sulfur proteins from Bacillus polymyxa (ferredoxins I and II) have been shown to transfer 1 electron per 4 iron atoms at a potential of -380 and -420 mv, respectively, at pH 7. The proteins contain 4 iron and 4 labile sulfur atoms and 4 cysteine residues in molecules of about 9,000 daltons; electron paramagnetic resonance and optical properties suggest that each contains an iron-sulfur...

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Ammonia Assimilation in Bacillus polymyxa

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ژورنال

عنوان ژورنال: Journal of Bacteriology

سال: 1972

ISSN: 0021-9193,1098-5530

DOI: 10.1128/jb.110.3.1211-1213.1972