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Related Experiment Videos

A specific enzyme for glucose 1,6-bisphosphate synthesis.

I A Rose, J V Warms, G Kaklij

    The Journal of Biological Chemistry
    |May 10, 1975
    PubMed
    Summary

    Researchers identified a novel mouse brain enzyme crucial for synthesizing glucose-1,6-bisphosphate (glucose-1,6-P2). This enzyme requires divalent metal cofactors and shows specific substrate preferences, suggesting its key role in brain glucose metabolism.

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    Biochemistry·1993

    Area of Science:

    • Biochemistry
    • Enzymology
    • Neuroscience

    Background:

    • The synthesis of glucose-1,6-bisphosphate (glucose-1,6-P2) is vital for carbohydrate metabolism.
    • Understanding the specific enzymes involved in brain glucose metabolism is crucial for neurological research.

    Purpose of the Study:

    • To identify and characterize the enzyme responsible for glucose-1,6-P2 synthesis in the mouse brain.
    • To elucidate the catalytic properties and cofactor requirements of this novel enzyme.

    Main Methods:

    • Enzyme purification from mouse brain tissue.
    • Assessing enzyme activity with various substrates and potential inhibitors.
    • Determining cofactor requirements through treatment with chelators (EDTA) and testing various metal ions.

    Main Results:

    • A distinct enzyme catalyzing the reaction glycerate-1,3-P2 + glucose-1-P -> glucose-1,6-P2 + glycerate-P was purified with >50% yield.
    • The enzyme demonstrated a requirement for divalent metal ions, with Mg2+, Mn2+, Ca2+, Zn2+, Ni2+, Co2+, and Cd2+ acting as effective cofactors.
    • Glucose-6-P and mannose-1-P served as alternative acceptors, while fructose-1,6-P2, glycerate-2,3-P2, enolpyruvate-P, and acetyl CoA caused strong inhibition.

    Conclusions:

    • The purified enzyme is likely responsible for glucose-1,6-P2 synthesis in the brain based on its activity and kinetic properties.
    • The enzyme's specific cofactor and substrate profile provides insights into its physiological role in brain metabolism.

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