ArticleBMC microbiology2007
Phylogenomics and signature proteins for the alpha proteobacteria and its main groups.
Article in BMC microbiology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 61 papers.
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61 citing papers in PubMed, 158 citations in OpenAlex.
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2 authors at 1 institution in 1 country.
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Abstract
backgroundAlpha proteobacteria are one of the largest and most extensively studied groups within bacteria. However, for these bacteria as a whole and for all of its major subgroups (viz. Rhizobiales, Rhodobacterales, Rhodospirillales, Rickettsiales, Sphingomonadales and Caulobacterales), very few or no distinctive molecular or biochemical characteristics are known.
resultsWe have carried out comprehensive phylogenomic analyses by means of Blastp and PSI-Blast searches on the open reading frames in the genomes of several alpha-proteobacteria (viz. Bradyrhizobium japonicum, Brucella suis, Caulobacter crescentus, Gluconobacter oxydans, Mesorhizobium loti, Nitrobacter winogradskyi, Novosphingobium aromaticivorans, Rhodobacter sphaeroides 2.4.1, Silicibacter sp. TM1040, Rhodospirillum rubrum and Wolbachia (Drosophila) endosymbiont). These studies have identified several proteins that are distinctive characteristics of all alpha-proteobacteria, as well as numerous proteins that are unique repertoires of all of its main orders (viz. Rhizobiales, Rhodobacterales, Rhodospirillales, Rickettsiales, Sphingomonadales and Caulobacterales) and many families (viz. Rickettsiaceae, Anaplasmataceae, Rhodospirillaceae, Acetobacteraceae, Bradyrhiozobiaceae, Brucellaceae and Bartonellaceae). Many other proteins that are present at different phylogenetic depths in alpha-proteobacteria provide important information regarding their evolution. The evolutionary relationships among alpha-proteobacteria as deduced from these studies are in excellent agreement with their branching pattern in the phylogenetic trees and character compatibility cliques based on concatenated sequences for many conserved proteins. These studies provide evidence that the major groups within alpha-proteobacteria have diverged in the following order: (Rickettsiales(Rhodospirillales (Sphingomonadales (Rhodobacterales (Caulobacterales-Parvularculales (Rhizobiales)))))). We also describe two conserved inserts in DNA Gyrase B and RNA polymerase beta subunit that are distinctive characteristics of the Sphingomonadales and Rhodosprilllales species, respectively. The results presented here also provide support for the grouping of Hyphomonadaceae and Parvularcula species with the Caulobacterales and the placement of Stappia aggregata with the Rhizobiaceae group.
conclusionThe alpha-proteobacteria-specific proteins and indels described here provide novel and powerful means for the taxonomic, biochemical and molecular biological studies on these bacteria. Their functional studies should prove helpful in identifying novel biochemical and physiological characteristics that are unique to these bacteria.
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