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Archived Comments for: The origin of a derived superkingdom: how a gram-positive bacterium crossed the desert to become an archaeon

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  1. One more proof that archaeon was derived from gram-positive bacterium

    Valery Anisimov, A2iA

    28 November 2012

    Practically all bacteria and mostly deep lines of archaea (Korarchaeota, Thaumarchaeota) possess only
    one copy of the DNA-directed RNA polymerase subunit A' (COG0086K) but all the rest of archaea's domains possess two of them (subunits A' and subunit A''), following each other. Interesting enough that most of Euryarchaeota possess also two homologs of the RNA polymerase subunit B (COG0085K), so it looks like branching order was: Gram-positive bacteria => early archaeons (Korarchaeota, Thaumarchaeota) => Crenarchaeota => Euryarchaeota.

    Competing interests

    None declared