Proton magnetic resonance study of ferredoxin from Clostridium pasteurianum
- PMID: 5266908
- PMCID: PMC282985
- DOI: 10.1073/pnas.65.4.797
Proton magnetic resonance study of ferredoxin from Clostridium pasteurianum
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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