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Journal of Dairy Science Vol. 48 No. 8 1010-1013
© 1965 by American Dairy Science Association ®
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Genetic Polymorphism in Caseins of Cow's Milk. VI. Amino Acid Composition of {alpha}s1-Caseins A, B, and C

W. G. Gordon, J. J. Basch and M. P. Thompson

Eastern Regional Research Laboratory,1 USDA, Philadelphia, Pennsylvania

ABSTRACT

The amino acid composition of highly purified preparations of the genetically controlled variants of {alpha}s1-casein, A, B, and C has been determined. B and C are virtually identical in composition, the only significant difference being that C contains one more glycine residue per mole than B. The data suggest that in B the missing glycine might be replaced by glutamic acid. The differences between A and the other variants are numerous and more substantial and, at present, cannot be accounted for in terms of single amino acid substitutions.

FOOTNOTES

1 Eastern Utilization Research and Development Division, Agricultural Research Service, United States Department of Agriculture.






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Copyright © 1965 by the American Dairy Science Association ®.