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Liver aldolase anomeric specificity

K J Schray, E E Howell, J M Waud

    Biochemistry
    |June 10, 1980
    PubMed
    Summary
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    Liver aldolase efficiently cleaves fructose 1,6-bisphosphate (FBP) by not binding its alpha anomer, unlike muscle or yeast aldolases. This allows rapid substrate anomerization and utilization, highlighting distinct enzyme specificities.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Metabolic pathways

    Background:

    • Aldolase enzymes catalyze crucial steps in glycolysis.
    • Different aldolase isozymes (liver, muscle, yeast) exhibit varying substrate specificities.
    • Understanding these differences is key to comprehending metabolic regulation.

    Purpose of the Study:

    • To investigate the kinetic differences in fructose 1,6-bisphosphate (FBP) utilization by liver aldolase compared to muscle and yeast aldolases.
    • To elucidate the role of FBP anomers (alpha and beta) in liver aldolase catalysis.
    • To confirm predicted differences in substrate binding and specificity among aldolase isozymes.

    Main Methods:

    • Stopped-flow kinetic studies were employed to monitor enzyme-substrate reactions in real-time.

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  • Computer simulations were used to interpret the kinetic data and model reaction mechanisms.
  • Comparative analysis of liver, mixed liver-muscle, muscle, and yeast aldolase activities was performed.

    • Main Results:

    • Liver aldolase demonstrated no binding or utilization of the alpha-anomer of FBP.
    • Muscle aldolase bound the alpha-anomer nonproductively, while yeast aldolase catalyzed its cleavage.
    • Liver aldolase achieved 100% substrate cleavage on the millisecond timescale due to rapid anomerization facilitated by its inability to bind alpha-FBP.

    Conclusions:

    • Liver aldolase exhibits unique substrate specificity, differing significantly from muscle and yeast aldolases.
    • The inability of liver aldolase to bind alpha-FBP drives rapid spontaneous anomerization, leading to complete substrate utilization.
    • These findings support the hypothesis of distinct substrate binding and catalytic properties across different aldolase isozymes.