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The recently assigned 1 H NMR hyperfine signals of Clostridium pasteurianum ferredoxin were investigated over the pH range 8-12 to monitor possible pH-dependent conformational changes of the protein. For very high pH values minor perturbations were detected in the chemical shifts of three signals assigned to β-CH 2 , cysteine protons of cluster II, while cluster I was not affected...
Treatment of Clostridium pasteurianum ferredoxin (CpFd) with stoichiometric amounts of potassium ferricyanide results in the specific conversion of cluster I into a Fe 3 S 4+ species while leaving cluster II unaltered. Ferricyanide-treated CpFd derivative has been purified and characterized through biochemical and spectroscopical techniques. The cluster conversion process is reversible...
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