The phylogeny and signature sequences characteristics of Fibrobacteres, Chlorobi, and Bacteroidetes

Critical Reviews in Microbiology
Radhey S Gupta

Abstract

Fibrobacteres, Chlorobi, and Bacteroidetes (FCB group) comprise three main bacterial phyla recognized on the basis of 16S rRNA trees. Presently, there are no distinctive biochemical or molecular characteristics known that can distinguish these bacteria from other bacterial phyla. The relationship of these bacteria to other phyla is also not known. This review describes many signatures, consisting of defined and conserved inserts in widely distributed proteins, that provide distinctive molecular markers for these groups of bacteria. These signatures serve to clarify the evolutionary relationship between members of the FCB group, and to other bacterial phyla. A 4 aa insert in DNA Gyrase B (GyrB) and a 45 aa insert in the SecA proteins are uniquely shared by various Bacteroidetes species. The insert in GyrB is present in all Bacteroidetes species (>100) covering different orders and families, indicating that it is a distinctive characteristic of the group. Three signatures consisting of an 18 aa insert in ATPase alpha-subunit, an 8-9 aa insert in the FtsK protein and a 1 aa insert in the UvrB protein are commonly shared only by the Bacteroidetes and Chlorobi homologs providing evidence that these two groups are specifically relate...Continue Reading

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