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- W2062620729 abstract "Few studies measuring thermodynamic metal ion selectivity of metalloproteins have been performed, and the major determinants of metal ion selectivity in proteins are not yet well understood. Several features of metal ion binding sites and metal coordination have been hypothesized to alter the transition metal selectivity of chelators, including (1) the polarizability of the coordinating atom, (2) the relative sizes of the binding site and the metal ion, and (3) the metal ion binding site geometry. To test these hypotheses, we have measured the metal ion affinity and selectivity of a prototypical zinc enzyme, human carbonic anhydrase II (CAII), and a number of active site variants where one of the coordinating ligands is substituted by another side chain capable of coordinating metal. CAII and almost all of the variants follow the inherent metal ion affinity trend suggested by the Irving−Williams series, demonstrating that this trend operates within proteins as well as within small molecule chelators and may be a dominant factor in metal ion selectivity in biology. Neither the polarizability of the liganding side chains nor the size of the metal ion binding site correlates strongly with metal ion specificity; instead, changes in metal ion specificity in the variants correlate with the preferred coordination number and geometry of the metal ion. This correlation suggests that a primary feature driving deviations from the inherent ligand affinity trend is the positioning of active site groups such that a given metal ion can adopt a preferred coordination number/geometry." @default.
- W2062620729 created "2016-06-24" @default.
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- W2062620729 date "2004-03-06" @default.
- W2062620729 modified "2023-09-23" @default.
- W2062620729 title "Probing Determinants of the Metal Ion Selectivity in Carbonic Anhydrase Using Mutagenesis" @default.
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- W2062620729 doi "https://doi.org/10.1021/bi0498914" @default.
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