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The lactose synthase acceptor site: a structural map derived from acceptor studies.

L J Berliner, M E Davis, K E Ebner

    Molecular and Cellular Biochemistry
    |April 1, 1984
    PubMed
    Summary
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    This study maps the lactose synthase acceptor binding site, revealing key structural requirements for substrate acceptance. Alpha-lactalbumin modifies this specificity, suggesting a distinct hydrophobic binding interaction.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Structural Biology

    Background:

    • Lactose synthase (galactosyl transferase) is crucial for lactose biosynthesis.
    • Understanding its acceptor binding site is key to elucidating enzyme function and regulation.
    • Alpha-lactalbumin significantly alters the substrate specificity of galactosyl transferase.

    Purpose of the Study:

    • To formulate a pictorial map of the lactose synthase acceptor binding site.
    • To delineate the structural requirements for acceptor substrates.
    • To investigate the influence of alpha-lactalbumin on acceptor binding specificity.

    Main Methods:

    • Analysis of published studies on substrate analogs and inhibitors.
    • Formulation of a pictorial map based on structural and binding data.

    Related Experiment Videos

  • Comparative analysis of galactosyl transferase activity with and without alpha-lactalbumin.

    • Main Results:

    • A pyranose, thiopyranose, or inositol ring with equatorial substituents (C-2 to C-5) is required.
    • The aglycone at C-1 can be alpha or beta, with alpha preferred.
    • Alpha-lactalbumin binding permits axial aglycone substituents and alters N-acyl chain length tolerance, suggesting interaction with a hydrophobic site.

    Conclusions:

    • The study provides a detailed model of the lactose synthase acceptor binding site.
    • Alpha-lactalbumin acts as a regulatory protein, modifying enzyme specificity through hydrophobic interactions.
    • These findings enhance our understanding of carbohydrate-binding proteins and enzyme-substrate recognition.