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C-terminal labelling of beta-casein.

C Carles, P Gueguen, B Ribadeau-Dumas

    FEBS Letters
    |February 9, 1987
    PubMed
    Summary

    This study demonstrates specific C-terminal protein labeling using carboxypeptidase Y. The method successfully modified beta-casein with tritiated phenylalanine, offering a novel tool for protein research.

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    Area of Science:

    • Biochemistry
    • Protein Chemistry
    • Enzymology

    Background:

    • Carboxypeptidase Y is a carboxypeptidase enzyme.
    • Protein labeling is crucial for biochemical studies.
    • C-terminal modification of proteins presents unique challenges.

    Purpose of the Study:

    • To report the first specific labeling of a native protein at its C-terminal end.
    • To utilize carboxypeptidase Y-catalyzed transpeptidation for this purpose.
    • To investigate the feasibility of C-terminal modification using beta-casein and tritiated Phe amide.

    Main Methods:

    • Carboxypeptidase Y-catalyzed transpeptidation reaction.
    • Radiolabeling of beta-casein with tritiated phenylalanine amide.
    • Tryptic digestion of the modified protein.
    • Reversed-phase High-Performance Liquid Chromatography (HPLC) for peptide separation.
    • Fast Atom Bombardment (FAB) mass spectrometry for sequence determination.

    Main Results:

    • Specific C-terminal labeling of native beta-casein was achieved.
    • The modification involved the substitution of Ile 207 with Phenylalanine (Phe) and deletion of Val-209 and Ile-208.
    • Deamidation was presumed to occur post-transpeptidation.
    • Identical results were obtained using an isolated C-terminal tryptic heptapeptide.

    Conclusions:

    • Carboxypeptidase Y-catalyzed transpeptidation is an effective method for specific C-terminal protein labeling.
    • This technique allows for precise modification of protein termini.
    • The findings provide a new avenue for creating labeled proteins for various biochemical applications.

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