A korarchaeal genome reveals insights into the evolution of the Archaea

Elkins, James G., Podar, Mircea, Graham, David E., Makarova, Kira S., Wolf, Yuri, Randau, Lennart, Hedlund, Brian P., Brochier-Armanet, Celine, Kunin, Victor, Anderson, Iain, Lapidus, Alla, Goltsman, Eugene, Barry, Kerrie, Koonin, Eugene V., Hugenholtz, Philip, Kyrpides, Nikos, Wanner, Gerhard, Richardson, Paul, Keller, Martin and Stetter, Karl O. (2008) A korarchaeal genome reveals insights into the evolution of the Archaea. Proceedings of the National Academy of Sciences of the United States of America, 105 23: 8102-8107. doi:10.1073/pnas.0801980105

Author Elkins, James G.
Podar, Mircea
Graham, David E.
Makarova, Kira S.
Wolf, Yuri
Randau, Lennart
Hedlund, Brian P.
Brochier-Armanet, Celine
Kunin, Victor
Anderson, Iain
Lapidus, Alla
Goltsman, Eugene
Barry, Kerrie
Koonin, Eugene V.
Hugenholtz, Philip
Kyrpides, Nikos
Wanner, Gerhard
Richardson, Paul
Keller, Martin
Stetter, Karl O.
Title A korarchaeal genome reveals insights into the evolution of the Archaea
Journal name Proceedings of the National Academy of Sciences of the United States of America   Check publisher's open access policy
ISSN 0027-8424
Publication date 2008-06-01
Sub-type Article (original research)
DOI 10.1073/pnas.0801980105
Open Access Status Not Open Access
Volume 105
Issue 23
Start page 8102
End page 8107
Total pages 6
Place of publication Washington, DC, United States
Publisher National Academy of Sciences
Language eng
Formatted abstract
The candidate division Korarchaeota comprises a group of uncultivated microorganisms that, by their small subunit rRNA phylogeny, may have diverged early from the major archaeal phyla Crenarchaeota and Euryarchaeota. Here, we report the initial characterization of a member of the Korarchaeota with the proposed name, "Candidatus Korarchaeum cryptofilum," which exhibits an ultrathin filamentous morphology. To investigate possible ancestral relationships between deep-branching Korarchaeota and other phyla, we used whole-genome shotgun sequencing to construct a complete composite korarchaeal genome from enriched cells. The genome was assembled into a single contig 1.59 Mb in length with a G + C content of 49%. Of the 1,617 predicted protein-coding genes, 1,382 (85%) could be assigned to a revised set of archaeal Clusters of Orthologous Groups (COGs). The predicted gene functions suggest that the organism relies on a simple mode of peptide fermentation for carbon and energy and lacks the ability to synthesize de novo purines, CoA, and several other cofactors. Phylogenetic analyses based on conserved single genes and concatenated protein sequences positioned the korarchaeote as a deep archaeal lineage with an apparent affinity to the Crenarchaeota. However, the predicted gene content revealed that several conserved cellular systems, such as cell division, DNA replication, and tRNA maturation, resemble the counterparts in the Euryarchaeota. In light of the known composition of archaeal genomes, the Korarchaeota might have retained a set of cellular features that represents the ancestral archaeal form.
Keyword Microbial cultivation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: ERA 2012 Admin Only
School of Chemistry and Molecular Biosciences
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Created: Mon, 28 Nov 2011, 09:47:13 EST by Hong Lee on behalf of School of Chemistry & Molecular Biosciences