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Related Experiment Videos

Bacterial xanthine oxidase from Arthrobacter S-2.

C A Woolfolk, J S Downard

    Journal of Bacteriology
    |August 1, 1978
    PubMed
    Summary

    This study characterizes xanthine oxidase from Arthrobacter S-2, revealing its high activity and unique properties compared to milk-derived enzymes. The bacterial enzyme shows potential for purine oxidation research.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Microbial Biochemistry

    Background:

    • Xanthine oxidase is a crucial enzyme in purine metabolism.
    • Bacterial sources offer potential for novel enzyme discovery and characterization.

    Purpose of the Study:

    • To isolate and characterize xanthine oxidase from the bacterium Arthrobacter S-2.
    • To compare the enzymatic properties of bacterial xanthine oxidase with its mammalian counterparts.

    Main Methods:

    • Enrichment culture of Arthrobacter S-2 on xanthine.
    • Enzyme purification and activity assays.
    • Spectroscopic analysis and determination of kinetic parameters (Km).

    Main Results:

    • Arthrobacter S-2 produced high levels of xanthine oxidase activity.
    • The bacterial enzyme exhibited relative specificity for purine oxidation.
    • Kinetic analysis revealed a high Km for xanthine (1.3 X 10(-4) M) without substrate inhibition.
    • The enzyme's specific activity was significantly higher than that of milk xanthine oxidase.
    • Spectral analysis suggested similarity in prosthetic centers to milk xanthine oxidase.
    • The enzyme's molecular weight was determined to be approximately 146,000 Da (native) and 79,000 Da (subunit).

    Conclusions:

    • Arthrobacter S-2 xanthine oxidase is a highly active and potentially useful enzyme.
    • The bacterial enzyme possesses distinct kinetic properties compared to milk xanthine oxidase.
    • Structural similarities suggest conserved prosthetic centers across different xanthine oxidase sources.

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