1887

Abstract

The evolutionary relationships of , and were studied based on phylogenetic trees for a concatenated dataset of 11 widely distributed proteins, as well as conserved inserts in several proteins. In phylogenetic trees, a close relationship of chlamydiae to was supported by different phylogenetic methods. Although the branched close to the chlamydiae- clade, their specific affiliation to these groups was generally not supported. Results are also presented for two conserved inserts, a 6 aa insert in the lysyl-tRNA synthetase and a 3 aa insert in the RNA polymerase subunit (RpoB), that are uniquely shared by and all available homologues, but which are not found in any of the available or other bacterial homologues. Signature sequences in a number of other proteins [including a large insert (>150 aa) in DNA gyrase B] provide information regarding the branching position of these groups relative to other bacterial phyla. A close and specific relationship of to the species, seen both in phylogenetic trees and by means of uniquely shared inserts in protein sequences, strongly indicates that these two groups of species shared a common ancestor exclusive of all other known bacteria. These results suggest that may be the closest free-living relatives of the parasitic chlamydiae.

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2007-08-01
2019-10-17
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