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Related Experiment Videos

Purification and crystallization of avidin.

N M Green, E J Toms

    The Biochemical Journal
    |June 1, 1970
    PubMed
    Summary

    Researchers developed a better way to purify avidin from eggs. The purified avidin effectively binds biotin, indicating a molecular structure composed of four identical subunits.

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    Area of Science:

    • Biochemistry
    • Protein Chemistry

    Background:

    • Avidin is a protein found in egg whites known for its strong binding affinity to biotin.
    • Understanding avidin's structure and properties is crucial for various biotechnological applications.

    Purpose of the Study:

    • To describe an improved method for purifying avidin from hen's-egg white.
    • To characterize the purified avidin's biotin-binding capacity and molecular composition.

    Main Methods:

    • Improved purification techniques, including crystallization, were employed.
    • Biotin-binding assays were performed to determine the avidin's efficacy.
    • Amino acid composition analysis was conducted to elucidate the molecular structure.

    Main Results:

    • A highly purified avidin product was obtained.
    • The purified avidin demonstrated a biotin-binding capacity of 15.1 µg/mg, with an equivalent weight of 16200.
    • Amino acid analysis revealed integral residue numbers, suggesting a tetrameric structure.

    Conclusions:

    • The improved purification method yields high-quality avidin.
    • The results support the conclusion that avidin molecules (approx. 66000 mol. wt.) consist of four identical subunits.

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