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Quantifying metal-binding by force: A quantitative single-molecule force-spectroscopy-based assay is developed to measure the binding affinity of metal ions to proteins. The method uses the unfolding force of a protein as a direct probe to distinguish the apo and metal-ion-bound forms of that protein and quantify the partitioning between the two forms (see figure).
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Cao et al. (2009) studied this question.
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