The natural evolutionary relationships among prokaryotes
| Venue: | Crit. Rev |
| Citations: | 37 - 3 self |
BibTeX
@ARTICLE{Gupta_thenatural,
author = {Radhey S. Gupta},
title = {The natural evolutionary relationships among prokaryotes},
journal = {Crit. Rev},
year = {},
pages = {26--111}
}
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Abstract
To understand the evolution of photosynthetic bacteria it is necessary to understand how the main groups within Bacteria have evolved from a common ancestor, a critical issue that has not been resolved in the past. Recent analysis of shared conserved inserts or deletions (indels) in protein sequences has provided a powerful means to resolve this long-standing problem in microbiology. Based on a set of 25 indels in highly conserved and widely distributed proteins, all main groups within bacteria can now be defined in clear molecular terms and their relative branching orders logically deduced. For the 82 presently completed bacterial genomes, the presence or absence of these signatures in various proteins was found to be almost exactly as predicted by the indel model, with only 11 exceptions observed in 1842 observations. The branching order of different bacterial groups as deduced using this approach is as follows: low G+C Gram-positive (Heliobacterium chlorum) → high G+C Gram-positive → Clostridium–Fusobacterium–Thermotoga → Deinococcus–Thermus → green nonsulfur bacteria (Chloroflexus aurantiacus) → Cyanobacteria → Spirochetes → Chlamydia–Cytophaga–Flavobacteria–green sulfur bacteria (Chlorobium tepidum) → Aquifex → Proteobacteria (δ and ) → Proteobacteria (α) → Proteobacteria (β) and → Proteobacteria (γ). The Heliobacterium species, which contain an Fe–S type of reaction center (RC 1) and represent the sole photosynthetic phylum from the Gram-positive or monoderm bacteria (i.e., bounded by
Keyphrases
natural evolutionary relationship main group critical issue relative branching order long-standing problem recent analysis powerful mean clear molecular term distributed protein chlorobium tepidum heliobacterium chlorum various protein low gram-positive conserved insert protein sequence fe type indel model different bacterial group monoderm bacteria common ancestor chloroflexus aurantiacus aquifex proteobacteria bacterial genome heliobacterium specie sole photosynthetic phylum photosynthetic bacteria reaction center
