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Methanopyrus kandleri: an archaeal methanogen unrelated to all other known methanogensAnalysis of its 16S rRNA sequence shows that the newly discovered hyperthermophilic methanogen, Methanopryus kandleri, is phylogenetically unrelated to any other known methanogen. The organism represents a separate lineage originating near the root of the archaeal tree. Although the 16S rRNA sequence of Mp. kandleri resembles euryarchaeal 16S rRNAs more than it does crenarchaeal, it shows more crenarchaeal signature features than any known euryarchaeal rRNA. Attempts to place it in relation to the root of the archaeal tree show that the Mp. kandleri lineage likely arises from the euryarchaeal branch of the tree. While the existence of so deeply branching a methanogenic lineage brings into question the thesis that methanogenesis evolved from an earlier metabolism similar to that seen in Thermococcus, it at the same time reinforces the notion that the aboriginal [correction of aborginal] archaeon was a thermophile.
Document ID
20040089507
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Burggraf, S.
(University of Illinois Urbana 61801, United States)
Stetter, K. O.
Rouviere, P.
Woese, C. R.
Date Acquired
August 21, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Systematic and applied microbiology
Volume: 14
ISSN: 0723-2020
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NSG-7044
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 52-30
NASA Program Exobiology
Non-NASA Center
NASA Discipline Exobiology

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