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Are extreme halophiles actually "bacteria"?

L J Magrum, K R Luehrsen, C R Woese

    Journal of Molecular Evolution
    |May 12, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Halobacterium halobium's 16S rRNA analysis reveals it is not a bacterial adaptation but an ancient Archaebacteria member. This finding reclassifies the organism, showing it is as distinct from bacteria as it is from eukaryotes.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Evolutionary Biology

    Background:

    • Halobacterium halobium is a halophilic organism.
    • Its evolutionary origins have been debated, with some suggesting it arose as an adaptation within typical bacteria.

    Purpose of the Study:

    • To investigate the evolutionary origins of Halobacterium halobium.
    • To determine if H. halobium is a specialized form of a typical bacterium or represents a distinct lineage.

    Main Methods:

    • Comparative cataloging of the 16S ribosomal RNA (rRNA) sequences of Halobacterium halobium.
    • Phylogenetic analysis based on 16S rRNA sequence data.

    Main Results:

    • The 16S rRNA cataloging of H. halobium indicates it did not originate as a halophilic adaptation from a typical bacterium.

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  • Phylogenetic analysis places H. halobium within the Archaebacteria domain.
  • H. halobium is evolutionarily distant from typical bacteria.

    • Conclusions:

    • Halobacterium halobium is a member of the Archaebacteria, not a derivative of typical bacteria.
    • Archaebacteria represent an ancient domain of life, distinct from both Bacteria and Eukaryotes.
    • The evolutionary history of H. halobium supports the distinct nature of the Archaebacteria.