1H-NMR analysis of turkey egg-white lysozyme and comparison with hen egg-white lysozyme

The complete main chain and approximately 75% of the side chain 1H-NMR assignments of the 129-residue protein, turkey egg-white lysozyme, are presented. NOE data, hydrogen-exchange rates, chemical shifts and coupling constants are reported and are indicative of a structure in solution that is essentially identical to that of the homologous hen egg-white lysozyme. The NH-alpha CH coupling constants of turkey lysozyme are compared to torsion-angle data from three crystal structures of the protein and the results are interpreted in terms of crystal-structure resolution and refinement.