title: The formation and structure of some proteose-peptone components.
abstract: Two constituents of the proteose-peptone fraction of bovine milk have been isolated and characterized. Component 5 (PP5) has been shown to represent residues 1-105 and 1-107 of the beta-casein amino acid sequence, while component 8-fast (PP8F) corresponds to residues 1-28 of beta-casein. Thus, these proteose-peptones represent the N-terminal portions of the beta-casein molecule, produced by proteolytic cleavages which form the gamma 1, gamma 2 and gamma 3-caseins from the C-terminal part. The continuing formation of the total proteose-peptone fraction, PP5, PP8F and the gamma-caseins during storage of raw milk at 18 or 37 degrees C has been also been demonstrated.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002364:Caseins / Q000032:analysis*; D002417:Cattle; D005260:Female; D006358:Hot Temperature; D008892:Milk / Q000032:analysis*; D008894:Milk Proteins / Q000032:analysis*; D010446:Peptide Fragments / Q000032:analysis; D011489:Protein Denaturation
chemical_list: D000596:Amino Acids; D002364:Caseins; D008894:Milk Proteins; D010446:Peptide Fragments