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    Eur J Biochem. 1992 Jul 1;207(1):215-22.

    The multimeric structure and disulfide-bonding pattern of bovine kappa-casein.

    Source

    MD Foods Research and Development Center, Brabrand, Denmark.

    Abstract

    Bovine kappa-casein was analyzed by SDS/PAGE, MS and amino acid sequence analysis in order to determine its multimeric composition and disulfide-bonding pattern. SDS/PAGE revealed that kappa-casein in the native state can range in size from a monomer to a multimeric structure larger than a decamer. Three types of interchain disulfide linkage, Cys11-Cys11, Cys11-Cys88 and Cys88-Cys88, were all assigned in multimers purified from [14C]carboxymethylated and untreated bulk milk, as well as a milk sample from a kappa-casein-variant-B homozygote Co20. These results indicate that multimerization occurs in a random or at present unpredictable disulfide-bonding pattern regardless of the size of the multimer or the genotype.

    PMID:
    1628650
    [PubMed - indexed for MEDLINE]
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