Journal of Molecular Evolution

, Volume 27, Issue 2, pp 121–125 | Cite as

A unique type of eubacterial 5S rRNA in members of the order Planctomycetales

  • Daniel Bomar
  • Stephen Giovannoni
  • Erko Stackebrandt


Analysis of the 5S ribosomal RNA from members of the eubacterial order Planctomycetales, i.e.,Planctomyces, Pirella, Gemmata, andIsosphaera, reveals several unexpected features. Firstly, the primary structures are significantly shorter than those of the majority of eubacteria and vary in length between 109 and 111 nucleotides. Secondly, the lack of an insertion at position 66 is a feature not encountered before in prokaryotic 5S rRNAs. Thirdly, as compared to the proposed eubacterial “minimal” 5S rRNA structure (Erdmann and Wolters 1986) the secondary structure contains numerous basepair transversions. The isolated position of the planctomycetes as an individual eubacterial division and the phylogenetic position of its genera are in accord with the results obtained from 16S rRNA cataloguing.

Key words

5S rRNA Phylogeny Tachytelic evolution Eubacteria Planctomycetes 


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Copyright information

© Springer-Verlag New York Inc. 1988

Authors and Affiliations

  • Daniel Bomar
    • 1
  • Stephen Giovannoni
    • 2
  • Erko Stackebrandt
    • 1
  1. 1.Institut für Allgemeine MikrobiologieChristian Albrechts UniversitätKielFRG
  2. 2.Department of BiologyIndiana UniversityBloomingtonUSA

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