Iron-sulfur proteins for which crystal structures are known all contain several NH .. S hydrogen bonds between backbone amide groups and sulfur atoms in the iron-sulfur cluster.Moreover, there is an approximate correlation between the number of such NH ... S hydrogen bonds in the environment of a given (Cys- S)4Fe4S4* cluster and its oxidation-reduction potential (Carter, C. W.
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Sheridan et al. (1981) studied this question.
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