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Divalent metal ion binding to the bacterial iron-storage protein, bacterioferritin (BFR), which contains a dinuclear metal binding site within each of its 24 subunits, was investigated by potentiometric and spectrophotometric methods. Cobalt(II) and zinc(II) were found to bind at both high- and low-affinity sites. Cobalt(II) binding at the high-affinity site was observed at a level of two per subunit...
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