Abstract
The interaction of different species variants of cytochrome c and myoglobin, as well as hen egg white lysozyme, with the hard Lewis metal ions Al3+, Ca2+, Fe3+, and Yb3+ and the borderline metal ion Cu2+, immobilized to iminodiacetic acid (IDA)-Sepharose CL-4B, has been investigated over the range pH 5.5-8.0. With appropriately chosen buffer and metal ion conditions, these proteins can be bound to the immobilized Mn+-IDA adsorbents via negatively charged amino acid residues accessible on the protein surface. For example, tuna heart cytochrome c, which lacks surface-accessible histidine residues, readily bound to the Fe3+-IDA adsorbent, while the other proteins also showed affinity toward immobilized Fe3+-IDA adsorbents when buffers containing 30 mM of imidazole were used. These studies document that protein selectivity can be achieved with hard-metal-ion immobilized metal ion affinity chromatography (IMAC) systems through the interaction of surface-exposed aspartic and glutamic acid residues on the protein with the immobilized Mn+-IDA complex. These investigations have also documented that the so-called soft or borderline immobilized metal ions such as the Cu2+-IDA adsorbent can also interact with surface-accessible aspartic an...Continue Reading
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