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Related Experiment Videos

Brain adenosine 5'-triphosphate-creatine phosphotransferase.

R S Atherton, J F Laws, B J Miles

    The Biochemical Journal
    |December 1, 1970
    PubMed
    Summary

    A new, efficient method purifies ox brain creatine kinase, revealing two essential thiol groups crucial for its activity. The enzyme

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Creatine kinase (ATP-creatine phosphotransferase, EC 2.7.3.2) is vital for cellular energy homeostasis.
    • Existing purification methods for ox brain creatine kinase are often inefficient, yielding low quantities.
    • Understanding the enzyme's active site is crucial for elucidating its catalytic mechanism and evolutionary history.

    Purpose of the Study:

    • To develop a superior purification method for ox brain creatine kinase.
    • To investigate the role of thiol groups in creatine kinase activity.
    • To determine the amino acid sequence surrounding the active site thiols and explore evolutionary implications.

    Main Methods:

    • A novel, rapid, and high-yield purification protocol for ox brain creatine kinase.
    • Stoichiometric inhibition studies using iodoacetate to probe enzyme activity.
    • Amino acid sequencing of the active site region and analysis of DNS-amino acids on silica gel.

    Main Results:

    • The developed method significantly improves creatine kinase yield and purity compared to existing procedures.
    • Two essential thiol groups were identified, critical for enzyme function, similar to muscle creatine kinase.
    • The amino acid sequence around the active site thiols shows high similarity to mammalian creatine kinases and arginine kinase.

    Conclusions:

    • A more efficient method for purifying ox brain creatine kinase has been established.
    • The study confirms the essentiality of two thiol groups for enzyme activity and provides sequence data.
    • The findings offer insights into the evolutionary conservation of creatine kinase active sites.

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