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. ❋ Unknown (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. ❋ Unknown (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). ❋ Unknown (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. ❋ Unknown (2007)

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. ❋ Unknown (2006)

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. ❋ Unknown (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. ❋ Unknown (2006)

However, in our view, they do not indicate that the eukaryote genome arose as a mosaic pieced together from archaeal and bacterial genomes. ❋ Unknown (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. ❋ Unknown (2006)

Bacterial flagella are, in fact, diverse in composition (and quite distinct from archaeal analogs), but concerning eight axial bacterial proteins these authors inferred that “the flagellar rod-hook-filament complex has clearly evolved by multiple rounds of gene duplication and subsequent diversification, starting from just two proteins (a proto-flagellin and a proto-rod/hook protein)”. ❋ Unknown (2007)

Speaking of LGT and flagella archaeal flagella this time: ❋ Unknown (2007)

The growing number of complete archaeal genomes now permits to investigate the evolution of this unique motility system. ❋ Unknown (2007)

Phylogenomics of the archaeal flagellum: rare horizontal gene transfer in a unique motility structure. ❋ Unknown (2007)

RESULTS: We report here an exhaustive phylogenomic analysis of the components of the archaeal flagellum. ❋ Unknown (2007)

Because this apparently still confuses many, please note that the eukaryotic cilium or flagellum is entirely different from the bacterial flagellum, which is entirely different from the archaeal flagellum. ❋ Unknown (2007)

Interestingly, experimental data have shown that the archaeal flagellum is non-homologous to the bacterial flagellum either in terms of overall structure, components and assembly. ❋ Unknown (2007)

In all complete archaeal genomes, the genes coding for flagellum components are co-localized in one or two well-conserved genomic clusters showing two different types of organizations. ❋ Unknown (2007)

ABSTRACT: BACKGROUND: As bacteria, motile archaeal species swim by means of rotating flagellum structures driven by a proton gradient force. ❋ Unknown (2007)

Moreover, we show that the components of the archaeal flagellar system have not been frequently transferred among archaeal species, indicating that gene fixation following HGT can also be rare for genes encoding components of large macromolecular complexes with a structural role. harold ❋ Unknown (2007)

We propose an evolutionary scenario for the evolution of the components of the archaeal flagellum. ❋ Unknown (2007)