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Related Experiment Videos

Superoxide dismutase from Mycobacterium tuberculosis

E Kusunose, K Ichihara, Y Noda

    Journal of Biochemistry
    |December 1, 1976
    PubMed
    Summary

    Researchers purified superoxide dismutase from Mycobacterium tuberculosis. This iron-containing enzyme is secreted into the culture medium and shares identical antigenic structures with the virulent strain.

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    Area of Science:

    • Biochemistry
    • Microbiology
    • Enzymology

    Background:

    • Superoxide dismutase (SOD) is a crucial enzyme involved in cellular defense against oxidative stress.
    • Mycobacterium tuberculosis, the causative agent of tuberculosis, possesses SOD enzymes that play a role in its survival and virulence.
    • Understanding the properties and characteristics of M. tuberculosis SOD is essential for developing novel therapeutic strategies.

    Purpose of the Study:

    • To purify and characterize the superoxide dismutase enzyme from Mycobacterium tuberculosis, strain H37Ra.
    • To investigate the enzyme's molecular weight, subunit composition, and metal content.
    • To compare the immunological properties of M. tuberculosis SOD with those from other species.

    Main Methods:

    • Purification of superoxide dismutase using standard biochemical techniques.
    • Homogeneity assessment via polyacrylamide gel electrophoresis and analytical ultracentrifugation.
    • Molecular weight determination using sedimentation equilibrium and SDS-PAGE.
    • Metal analysis and Electron Spin Resonance (ESR) spectroscopy to identify iron content.
    • Immunological studies using antibodies raised against the purified enzyme.

    Main Results:

    • A superoxide dismutase was purified 275-fold from M. tuberculosis H37Ra, yielding a homogeneous enzyme.
    • The enzyme has a molecular weight of approximately 88,000 Da, composed of four subunits of 21,000 Da each.
    • Metal analysis and ESR confirmed the presence of approximately 3.7 iron atoms per mole of enzyme, indicating one iron atom per subunit.
    • The amino acid composition is similar to other iron-containing SODs.
    • The enzyme from the virulent M. tuberculosis H37Rv strain showed identical antigenic structures to the H37Ra enzyme.
    • Manganese-containing SODs from other mycobacteria exhibited only partial immunological identity.
    • The M. tuberculosis SOD was found to be secreted into the culture medium during bacterial growth.

    Conclusions:

    • The purified superoxide dismutase from M. tuberculosis H37Ra is an iron-containing enzyme with a tetrameric structure.
    • The enzyme shares identical antigenic properties with the virulent M. tuberculosis H37Rv strain, suggesting its importance in pathogenesis.
    • The secretion of SOD into the culture medium may play a role in the bacterium's interaction with the host environment.

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