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Proceedings Paper

Overview of Archaea
Author(s): Elena V. Pikuta
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Paper Abstract

Archaea were separated from Eubacteria after discovery of their specifics in cell outer membrane that usually not affected by common antibiotics. Phylogenetic analysis introduced by Karl Wöese supported this separation. Presently, only two phyla Crenarchaeota and Euryarchaeota include the valid representatives. Another three phyla that were proposed based on the sequence analysis of environmental samples, do not contain validly published species, and for this reason they are not included in this review. The phylum Euryarchaeota currently includes eight classes and ten orders, while the Crenarchaeota phylum contains the only class with five orders. Members of the phyla Crenarchaeota have two or three family B and no family D DNA polymerases, but members of the Euryarchaeota contain the only family B polymerases and the only family D polymerases, and it is still not clear, which is the main functional enzyme in the replication process. In this article, we are present an update and comparative analysis for this domain, discussing unique features of this group and Evolution, estimating their physiology within the matrix of physic-chemical factors, and outlining future perspectives in their study. Rules of the diagonal for the diagrams with all Archaea are presented and discussed.

Paper Details

Date Published: 23 September 2011
PDF: 15 pages
Proc. SPIE 8152, Instruments, Methods, and Missions for Astrobiology XIV, 81520N (23 September 2011); doi: 10.1117/12.897082
Show Author Affiliations
Elena V. Pikuta, National Space Science and Technology Ctr. (United States)


Published in SPIE Proceedings Vol. 8152:
Instruments, Methods, and Missions for Astrobiology XIV
Richard B. Hoover; Paul C. W. Davies; Gilbert V. Levin; Alexei Yu. Rozanov, Editor(s)

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