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Related Experiment Videos

Sugar transport in Coprinus cinereus.

D Moore, M S Devadatham

    Biochimica Et Biophysica Acta
    |February 2, 1979
    PubMed
    Summary

    This study identifies two distinct glucose transport systems with varying affinities and sensitivities. Regulation appears to involve protein activity modulation rather than synthesis, suggesting a single allosteric carrier.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Glucose is a primary energy source, and its transport into cells is a fundamental biological process.
    • Understanding glucose transport mechanisms is crucial for metabolic research and disease understanding.

    Purpose of the Study:

    • To characterize the kinetic properties and regulatory mechanisms of glucose transport systems.
    • To investigate the genetic basis and molecular nature of glucose transporters.

    Main Methods:

    • Kinetic analysis of sugar uptake using various analogs (e.g., 2-deoxy-D-glucose, 3-O-methylglucose).
    • Inhibition studies with specific chemical agents (e.g., N-ethylmaleimide, quercetin, sodium azide).
    • Analysis of transport system behavior under different pH, temperature, and nutrient conditions.
    • Mutant analysis to identify genes involved in glucose transport.

    Main Results:

    • Two distinct glucose transport systems were identified: high-affinity (Km = 27 μM) and low-affinity (Km = 3.3 mM).
    • Both systems accumulate sugars against concentration gradients and exhibit differential sensitivity to inhibitors.
    • Regulation involves rapid inactivation/restoration of the high-affinity system, suggesting modulation of protein activity.
    • Mutant analysis points to a single gene (ftr cistron) encoding an allosteric protein for both systems.

    Conclusions:

    • The findings suggest a single carrier protein with negative cooperativity underlies both high and low affinity glucose transport.
    • Regulation of glucose transport is primarily achieved through modulation of carrier protein activity.
    • The ftr cistron is identified as the structural gene for this allosteric glucose transport protein.

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