Bovine alphaso Casein; a Phosphorylated Homologue of alphas1 Casein

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Abstract
After consideration of its electrophoretic behavior, amino acid composition and phosphate content, bovine .alpha.s0 casein was shown to differ from .alpha.s1 casein only in respect of its phosphate content. The presence in .alpha.s0 casein of 1 phosphate residue more than occurs in .alpha.s1 casein was confirmed by comparative degradative studies performed on both proteins. From these it was concluded that .alpha.s0 casein may be considered as being .alpha.s1 casein which was modified by phosphorylation of the seryl residue located at position 41.