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Applied and Environmental Microbiology, December 1999, p. 5586-5589, Vol. 65, No. 12
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Molecular Phylogenetic Analysis of Archaeal Intron-Containing Genes Coding for rRNA Obtained from a Deep-Subsurface Geothermal Water Pool

Ken Takai* and Koki Horikoshi

Deep-sea Microorganisms Research Group, Japan Marine Science & Technology Center, Yokosuka 237-0061, Japan

Received 9 July 1999/Accepted 8 September 1999

Molecular phylogenetic analysis of a naturally occurring microbial community in a deep-subsurface geothermal environment indicated that the phylogenetic diversity of the microbial population in the environment was extremely limited and that only hyperthermophilic archaeal members closely related to Pyrobaculum were present. All archaeal ribosomal DNA sequences contained intron-like sequences, some of which had open reading frames with repeated homing-endonuclease motifs. The sequence similarity analysis and the phylogenetic analysis of these homing endonucleases suggested the possible phylogenetic relationship among archaeal rRNA-encoded homing endonucleases.

* Corresponding author. Present address: Pacific Northwest National Laboratory, P.O. Box 999, Mail stop P7-50, Richland, WA 99352. Phone: (509) 373-3386. Fax: (509) 376-1321. E-mail: Ken.Takai{at}pnl.gov.

Applied and Environmental Microbiology, December 1999, p. 5586-5589, Vol. 65, No. 12
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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