The A-2 milk - a product for baby nutrition

More than 10 allele variants of the cow milk β-casein have been detected. The alleles A1 and A2 are met more often. The A1 variant differs from the A2 variant by a single aminoacid: β-casein A1 contains hystidine in the position 67 and A2 contains praline. Because of the primary protein structure cow milks A1 and A2 decompose in the human intestine forming different substances. When praline is replaced with hystidine the breaking up of the chain occurs in the 67th aminoacid and as a result the peptide is formed consisting of the seven aminoacids residues (from the 60th to the 66th) that is called bovine kazomorphine or BKM-7. When cow milk is applied in the baby foods different digestion of caseins is observed and concentration of kazomorphines in the blood serum.

casein, amino acids residue, kazomorphine