Proton magnetic resonance study of ferredoxin from Clostridium pasteurianum.
Proc Natl Acad Sci U S A 1970;
65:797-804. [PMID:
5266908 PMCID:
PMC282985 DOI:
10.1073/pnas.65.4.797]
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Abstract
Magnetic susceptibilities of both reduced and oxidized ferredoxin from Clostridium pasteurianum were obtained in solution. Whereas the reduced form exhibits a Curie law behavior, the magnetic susceptibility of oxidized ferredoxin in fact increases with temperature and suggests extensive antiferromagnetic exchange coupling between the component iron atoms. Contact-shifted resonances are observed for both forms of ferredoxin that are attributed to the beta-CH(2) protons of the eight cysteine residues. A model based on these results is presented.
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