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• W1528728345 abstract "The DNA binding stringency of restriction endonucleases is crucial for their proper function. The X‐ray structures of the specific and non‐cognate complexes of the restriction nuclease Eco RV are considerably different suggesting significant differences in the hydration and binding free energies. Nonetheless, the majority of studies performed at pH 7.5, optimal for enzymatic activity, have found a < 10‐fold difference between Eco RV binding constants to the specific and nonspecific sequences in the absence of divalent ions. We used a recently developed self‐cleavage assay to measure Eco RV–DNA competitive binding and to evaluate the influence of water activity, pH and salt concentration on the binding stringency of the enzyme in the absence of divalent ions. We find the enzyme can readily distinguish specific and nonspecific sequences. The relative specific–nonspecific binding constant increases strongly with increasing neutral solute concentration and with decreasing pH. The difference in number of associated waters between specific and nonspecific DNA– Eco RV complexes is consistent with the differences in the crystal structures. Despite the large pH dependence of the sequence specificity, the osmotic pressure dependence indicates little change in structure with pH. The large osmotic pressure dependence means that measurement of protein–DNA specificity in dilute solution cannot be directly applied to binding in the crowded environment of the cell. In addition to divalent ions, water activity and pH are key parameters that strongly modulate binding specificity of Eco RV." @default.
• W1528728345 created "2016-06-24" @default.
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• W1528728345 date "2011-06-22" @default.
• W1528728345 modified "2023-10-18" @default.
• W1528728345 title "Solution parameters modulating DNA binding specificity of the restriction endonuclease EcoRV" @default.
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• W1528728345 doi "https://doi.org/10.1111/j.1742-4658.2011.08198.x" @default.
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