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Related Experiment Videos

Adenosine diphosphate sulphurylase activity in leaf tissue.

J N Burnell, J W Anderson

    The Biochemical Journal
    |July 1, 1973
    PubMed
    Summary

    A new assay for ADP-sulphurylase uses sulphate-dependent phosphate-ADP exchange, offering improved sensitivity and directness. This enzyme, found in plant chloroplasts, is activated by Ba2+ and Ca2+ and sensitive to thiol reagents.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Plant Physiology

    Background:

    • ADP-sulphurylase is a key enzyme in sulfate assimilation.
    • Existing assays for ADP-sulphurylase are complex and less sensitive.
    • Understanding ADP-sulphurylase kinetics and properties is crucial for plant science.

    Purpose of the Study:

    • To develop and validate a novel, sensitive assay for ADP-sulphurylase activity.
    • To characterize the kinetic properties and cofactor requirements of ADP-sulphurylase from spinach and yeast.
    • To investigate the localization and potential interference of ADP-sulphurylase in related enzymatic pathways.

    Main Methods:

    • Development of a sulphate-dependent 32P-labelled inorganic phosphate (Pi)-ADP exchange assay.
    • Demonstration of ADP-sulphurylase activity in crude plant leaf extracts (spinach).
    • Enzymatic assays using purified yeast and spinach ADP-sulphurylase, including kinetic analysis and inhibitor studies.

    Main Results:

    • The new assay is simpler, more sensitive, and more direct than previous methods.
    • ADP-sulphurylase activity was localized to chloroplasts in spinach leaf tissue.
    • Enzyme activity was activated by Ba2+ and Ca2+, inhibited by high ionic strength, and sensitive to thiol reagents and fluoride, with a pH optimum of 8.
    • ATP inhibited the reaction, while selenate and molybdate did not.

    Conclusions:

    • The developed assay provides a robust tool for studying ADP-sulphurylase.
    • ADP-sulphurylase plays a significant role in sulfate metabolism within plant chloroplasts.
    • The enzyme's activity profile suggests potential regulatory mechanisms and its interference with other ATP-dependent sulfate activation pathways.

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