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Related Experiment Videos

Tetrapyrrole utilization by Bacteroids ruminocola

D R McCall, D R Caldwell

    Journal of Bacteriology
    |September 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    Bacteroides ruminicola can utilize various porphyrins, forming different heme-containing cytochromes. This versatility in tetrapyrrole metabolism highlights the organism's unique iron insertion capabilities.

    Area of Science:

    • Microbiology
    • Biochemistry
    • Molecular Biology

    Background:

    • Heme is crucial for heme-requiring bacteria like Bacteroides ruminicola.
    • Understanding tetrapyrrole utilization is key to bacterial metabolism.

    Purpose of the Study:

    • To investigate how Bacteroides ruminicola utilizes different porphyrins as growth factors.
    • To determine the types of heme and cytochromes formed.

    Main Methods:

    • Spectroscopic analysis (difference spectra, pyridine hemochromogens) of whole cells and hemochromogens.
    • Growth experiments using deuteroporphyrin, mesoporphyrin, and their metal chelates.

    Main Results:

    • Bacteroides ruminicola incorporates deuteroporphyrin and mesoporphyrin to form corresponding hemes.

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  • No conversion of these porphyrins to protoheme was observed.
  • Functional b-type cytochromes with non-protoheme prosthetic groups are synthesized.
  • The organism can remove nonferrous ions and insert iron (Fe2+) into tetrapyrrole nuclei.

    • Conclusions:

    • Bacteroides ruminicola exhibits significant versatility in tetrapyrrole utilization.
    • The bacterium can synthesize functional cytochromes with diverse heme prosthetic groups.
    • Metabolic flexibility in heme synthesis is a key characteristic of this organism.