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The subunit structure of bovine brain 14-3-2

G Roda, A Grasso, S Garretto

    Brain Research
    |April 1, 1977
    PubMed
    Summary

    Bovine brain protein 14-3-2 exists as a dimer of 25,000 molecular weight units, potentially aggregating into larger structures. This subunit structure was investigated using chromatography and peptide analysis.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Neuroscience

    Background:

    • The bovine brain specific protein 14-3-2 is a key component in neuronal function.
    • Understanding its subunit structure is crucial for elucidating its biological role.

    Purpose of the Study:

    • To investigate the subunit composition and quaternary structure of bovine brain protein 14-3-2.
    • To determine the minimal structural unit and potential aggregation states of the protein.

    Main Methods:

    • Hydroxylapatite chromatography to separate protein fractions.
    • Dimethylsuberimidate cross-linking to identify covalently linked units.
    • Cyanogen bromide and thermolysin digestion for peptide analysis.
    • Amino acid analysis and S-carboxymethylcysteine labeling for peptide mapping.

    Main Results:

    • Native 14-3-2 separated into two fractions, with one fraction capable of re-eluting.
    • Cross-linking revealed covalently bound units of 100,000 molecular weight.
    • Peptide analysis indicated a minimal structural unit of 25,000 molecular weight, suggesting a dimer.
    • The protein can aggregate to form higher molecular weight species.

    Conclusions:

    • Bovine brain protein 14-3-2 is likely a covalently linked dimer of 25,000 molecular weight subunits.
    • These dimers can further aggregate, forming larger protein complexes.
    • The exact nature of the linkage (intra- or inter-chain) requires further investigation.

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