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Related Experiment Videos

Siderophore production by Proteus mirabilis.

L P Evanylo, S Kadis, J R Maudsley

    Canadian Journal of Microbiology
    |August 1, 1984
    PubMed
    Summary

    Proteus mirabilis bacteria do not produce common siderophores but synthesize a novel metabolite, alpha-hydroxyisovaleric acid. This compound effectively chelates and delivers iron to the bacteria.

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Proteus mirabilis is a bacterium known to cause infections.
    • Previous studies found no evidence of catechol- or hydroxamate-type siderophore production in Proteus mirabilis.

    Purpose of the Study:

    • To investigate the siderophore production of Proteus mirabilis.
    • To identify novel iron-chelating compounds produced by these bacteria.

    Main Methods:

    • Gas chromatography-mass spectrometry (GC-MS) for metabolite identification.
    • Thin-layer chromatography (TLC) and ultraviolet absorption spectroscopy for confirmation.
    • Iron uptake assays in solid and liquid media.

    Main Results:

    • A previously unknown metabolite, alpha-hydroxyisovaleric acid, was identified in Proteus mirabilis.
    • Alpha-hydroxyisovaleric acid effectively chelated iron from a synthetic chelator (EDDHA).
    • This metabolite supplied iron to Proteus mirabilis in both agar and liquid cultures.
    • An enzyme was identified that converts alpha-hydroxyisovaleric acid to alpha-ketoisovaleric acid, linking it to the valine biosynthesis pathway.

    Conclusions:

    • Proteus mirabilis utilizes alpha-hydroxyisovaleric acid as a siderophore for iron acquisition.
    • This finding expands the known diversity of siderophores and their biosynthetic pathways.

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