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Related Experiment Videos

[Countercurrent distribution of polysulfonated proteins (author's transl)].

G Braunitzer, S J van der Walt, B Bless

    Hoppe-Seyler'S Zeitschrift Fur Physiologische Chemie
    |August 1, 1975
    PubMed
    Summary

    Bovine beta-lactoglobulin AB was chemically modified at lysine residues using sulfonic acid reagents. This modification allows for precise analysis and rapid enzymatic cleavage at arginine sites.

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    Area of Science:

    • Protein chemistry
    • Biochemistry
    • Chemical modification

    Context:

    • Bovine beta-lactoglobulin (B-LG) is a major whey protein.
    • Understanding protein structure-function relationships is crucial in food science and biotechnology.
    • Chemical modification offers a route to probe protein properties.

    Purpose:

    • To describe the reaction of B-LG AB with specific isothiocyanato sulfonic acid reagents.
    • To investigate the quantitative blocking of epsilon-amino groups of lysine.
    • To assess the utility of modified B-LG for countercurrent distribution analysis and enzymatic digestion.

    Summary:

    • Bovine beta-lactoglobulin AB was reacted with 4-(isothiocyanato) benzene sulfonic acid, 5-(isothiocyanato) benzol-1,3-bis(sulfonic acid), and 7-(isothiocyanato) naphthalene-1,3,5-tris(sulfonic acid).
    • The reaction resulted in the quantitative blocking of lysine's epsilon-amino groups.
    • The modified protein demonstrated suitability for countercurrent distribution analysis and rapid trypsin-mediated cleavage at arginine residues.

    Impact:

    • Provides a method for selective modification of B-LG.
    • Facilitates advanced analytical techniques for protein characterization.
    • Enables rapid and specific proteolysis for further structural studies.

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