The distance between bacterial species in sequence space

Despite the revolution caused by information from macromolecular sequences, the basis of bacterial classification remains the genus and the species. How do these terms relate to the variety of bacteria that exist on earth? In this paper, the inter- and intraspecies differences in amino acid sequence...

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Veröffentlicht in:Journal of molecular evolution 1996-06, Vol.42 (6), p.617-630
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description Despite the revolution caused by information from macromolecular sequences, the basis of bacterial classification remains the genus and the species. How do these terms relate to the variety of bacteria that exist on earth? In this paper, the inter- and intraspecies differences in amino acid sequence of several bacterial electron transport proteins, cytochromes c, and blue copper proteins are compared. For the soil and water organisms studied, bacterial species can be classed as "tight" when there is little intraspecies variation, or "loose" when this variation is large. For this set of proteins and organisms, interspecies variation is much larger than that within a species. Examples of "tight" species are Pseudomonas aeruginosa and Rhodobacter sphaeroides, while Pseudomonas stutzeri and Rhodopseudomonas palustris are loose species. The results are discussed in the context of the origin and age of bacterial species, and the distribution of genomes in "sequence space." The situation is probably different for commensal or pathogenic bacteria, whose population structure and evolution are linked to the properties of another organism.
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subjects Amino Acid Sequence
Animals
Bacteria - classification
Bacteria - genetics
Evolution, Molecular
Genes, Bacterial
Humans
Molecular Sequence Data
Phylogeny
Pseudomonas - genetics
Pseudomonas aeruginosa
Pseudomonas stutzeri
Rhodobacter sphaeroides
Rhodopseudomonas palustris
Rhodospirillaceae - genetics
Sequence Alignment
Sequence Homology, Amino Acid
Species Specificity
title The distance between bacterial species in sequence space
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