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Abstract. pKa values of amino acid side chains of ribonuclease T1 have been determined from the pH dependence of 13C and 15N resonances. It was possible to derive pKa values of single protonation or deprotonation sites of carboxylate and imidazole groups. Deviations from pKa values of free amino acids could be interpreted with electrostatic interactions of corresponding side chains with the protein...
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