Reevaluation of the Phylogenetic Depth of the Marine Aerobic Hyperthermophilic Archaeon <i>Aeropyrum pernix</i> Based on Comparative Analysis of 23S rRNA Sequences

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  • Nomura Norimichi
    Laboratory of Marine Microbiology, Division of Applied Bioscience. Graduate School of Agriculture, Kyoto University
  • Sako Yoshihiko
    Laboratory of Marine Microbiology, Division of Applied Bioscience. Graduate School of Agriculture, Kyoto University
  • Uchida Aritsune
    Laboratory of Marine Microbiology, Division of Applied Bioscience. Graduate School of Agriculture, Kyoto University

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  • Reevaluation of the Phylogenetic Depth of the Marine Aerobic Hyperthermophilic Archaeon Aeropyrum pernix Based on Comparative Analysis of 23S rRNA Sequences

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Abstract

Aeropyrum pernix, a strictly aerobic marine hyperthermophilic archaeon, has been studied as a potential biotechnological source. In order to clarify the phylogenetic position of A. pernix, the nearly complete nucleotide sequence of the 23S rRNA was determined and compared with the other hitherto known archaeal counterparts. To avoid the artifact caused by disparities of G+C content, transversion evolutionary distance analysis was adopted. The result confirmed that A. pernix is closely allied to the Pyrodictium-Desulfurococcus-Staphylothermus group (the order “Igneococcales”) within the kingdom Crenarchaeota. However, it also revealed that the genus Aeropyrum diverges sharply from the other genera within the family Desulfurococcaceae. Thus, we concluded that the decision to transfer the genus Aeropyrum from the family Desulfurococcaceae is reasonable in light of our present data, as well as the physiological characteristics of this archaeon reported previously.

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  • Fisheries science

    Fisheries science 65 (2), 254-258, 1999

    The Japanese Society of Fisheries Science

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