[Partial sequence of the amino acids of myoglobin in swine]

Comparison of the amino acid sequence of pig heart myoglobin with other ungulate myoglobins

The primary structure of pig heart myoglobin has been established by study of the tryptic peptides of whole globin and by analysis of the fragments obtained by CNBr cleavage. Thermolysin and chymotrypsin digestion were used to determine the sequence of the M fragment (56-131). Automatic Edman degradation of whole globin and of the M fragment completed the sequence of pig myoglobin. Comparison with other ungulates shows that pig myoglobin is far from other artiodactyls previously studied (ox and sheep) and close to the eutherian ancestral chain.

The covalent structure of dog myoglobin

The primary structure of the myoglobin of the domestic dog (German shepherd) was studied. Tryptic and thermolytic peptides were compared with the sequence of other known myoglobins; the stepwise automatic Edman's degradation of the whole globin and also the chymotryptic digestion of the median fragment obtained by CNBr cleavage completed this sequence. Comparison of the established dog myoglobin structure with those from other carnivora shows 16 differences versus badger, 20 versus harbour seal and 15 versus California sea lion.