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Journal of Dairy Science Vol. 54 No. 8 1103-1110
© 1971 by American Dairy Science Association ®
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Amino Acid Composition of {alpha}s3-, {alpha}s4-, and {alpha}s5-Caseins

P. D. Hoagland, M. P. Thompson and E. B. Kalan

Eastern Utilization Research and Development Division, ARS, USDA, Philadelphia, Pennsylvania 19118

ABSTRACT

Isolated {alpha}s5-casein (zone 0.86) is converted by treatment with 2-mercaptoethanol into two components with electrophoretic mobilities identical to those of {alpha}s3-casein (zone 1.04) and of {alpha}s4-casein (zone 1.00). The molar ratios of amino acids of {alpha}s3-, {alpha}s4-, and {alpha}s5-caseins are similar. The data suggest that {alpha}s5-casein is a molecule of {alpha}s3-casein united to a molecule of {alpha}s4-casein by at least one intermolecular disulfide bond. Moreover, a close relationship between {alpha}s3-casein and {alpha}s4-casein is revealed by the similarity of their amino acid molar ratios.






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Copyright © 1971 by the American Dairy Science Association ®.