![Effect of cysteine-25 on the ionization of histidine-159 in papain as determined by proton nuclear magnetic resonance spectroscopy. Evidence for a histidine-159-cysteine-25 ion pair and its possible role in catalysis]()
Effect of cysteine-25 on the ionization of histidine-159 in papain as determined by proton nuclear magnetic resonance spectroscopy. Evidence for a histidine-159-cysteine-25 ion pair and its possible role in catalysisLewis, Sidney D.; Johnson, Frederick Allen; Shafer, Jules A. · Biochemistry · 1981