Titration curves of all the H-2 and H-4 resonances of the eleven titrating histidine residues in ferrous carbon monoxide sperm whale myoglobin are given; the H-4 resonance of the distal histidine has been observed at ca. 2·2 p.p.m. upfield of its normal position and on titration, the distal histidine resonances give a pK′ of 5·2 at 40 °C.
J. H. Bradbury, S. L. M. Deacon and M. D. Ridgway, J. Chem. Soc., Chem. Commun., 1979, 997 DOI: 10.1039/C39790000997
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