archaeal

For example, he researched the genetic links found among these proteins in archaeal microorganisms that produce marsh gas and methane in cows and the human gut; in fruit flies, humans, round worms, and baker’s yeast; and in bacteria like E. coli and the pathogen that causes tuberculosis.

Darwin’s Theory of Universal Common Ancestry Confirmed in First Large-Scale Test | Impact Lab 2010

There is no evolutionary continuum between the domains of life; organisms have either the bacterial, archaeal, or eukaryal character [although Woese et al. think some evidence may link the last two domains] … no exceptions are seen; no "gray area" exists between the archaeal and bacterial signatures; the ribosome is of either bacterial or archaeal nature.

A Disclaimer for Behe? 2009

Woese then hazarded that such chimerism probably would not prove a significant problem, from the example provided by congruent alpha-proteobacterial trees based on cytochromes c and rRNA, from the general robustness of the rRNA phylogeny, and from its ability to predict certain domain-level phenotypic characters (for instance, the differences in bacterial and archaeal cell envelopes, transcription, and translation).

A Disclaimer for Behe? 2009

In general, large mitochondrial genomes contain a mix of presumed eukaryotic, archaeal and eubacterial genes, in contrast to what you expect if mitochondria are of eubacterial origin.

A critique on the endosymbiotic theory for the origin of mitochondria 2007

Jackson and Plano (2000) report that the Yersinia pestis FliH homolog YscL (corresponding to SctL/HrpE in Figure 4a) has low but significant sequence similarity with the e subunit of the archaeal ATPase of Methanococcus jannaschii and the e subunit of the vacuolar ATPase of Desulfurococcus spp.; these subunits are the homologs of the b subunit of the F1F0-ATP synthetase.

Congratulations are in Order 2006

Thus the present scenario predicts that careful multiple alignment of FliH sequences with bacterial F0-b and the corresponding archaeal and eukaryotic homologs (all of which would be equally related to FliH) will confirm homology.

Congratulations are in Order 2006

Perhaps interest in fusion models arose because BLAST searches suggest that different eukaryotic coding sequences are sometimes more closely related to archaeal homologs and other times more closely related to bacterial homologs.

Another Big Example of Reductive Evolution? 2006

However, in our view, they do not indicate that the eukaryote genome arose as a mosaic pieced together from archaeal and bacterial genomes.

Another Big Example of Reductive Evolution? 2006

So the most interesting thing about this is that the archaeal branch has suddenly moved a couple of centimeters to the right on that diagram.

Another Big Example of Reductive Evolution? 2006

RESULTS: We report here an exhaustive phylogenomic analysis of the components of the archaeal flagellum.

Current Biology on flagellum evolution - The Panda's Thumb 2007