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Fibrobacteres
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Fibrobacteres : ウィキペディア英語版
Fibrobacteres

Fibrobacteres is a small bacterial phylum which includes many of the major rumen bacteria, allowing for the degradation of plant-based cellulose in ruminant animals. Members of this phylum were categorized in other phyla. The genus ''Fibrobacter'' (the only genus of Fibrobacteres) was removed from the genus ''Bacteroides'' in 1988.
== Phylogeny and Comparative Genomic Studies ==

Although ''Fibrobacteres'', which consists of a single genus ''Fibrobacter'' containing two species, is currently recognized as a distinct phylum, phylogenetic studies based RpoC and Gyrase B protein sequences, indicate that ''Fibrobacter succinogenes'' is closely related to the species from the phyla ''Bacteroidetes'' and ''Chlorobi''.〔Gupta, R. S. (2004). The phylogeny and signature sequences characteristics of Fibrobacteres, Chlorobi, and Bacteroidetes. Critical Reviews in Microbiology. 30:123-140. doi: 10.1080/10408410490435133.〕 The species from these three phyla also branch in the same position based upon conserved signature indels in a number of important proteins.〔Griffiths E, Gupta RS. (2001) The use of signature sequences in different proteins to determine the relative branching order of bacterial divisions: evidence that Fibrobacter diverged at a similar time to Chlamydia and the Cytophaga- Flavobacterium-Bacteroides division. Microbiology,147:2611-22.〕 Lastly and most importantly, comparative genomic studies have identified two conserved signature indels (a 5-7 amino acid insert in the RpoC protein and a 13-16 amino acid insertion in serine hydroxymethyltransferase) and one signature protein (PG00081) that are uniquely shared by all of the species from these three phyla.〔Gupta, R. S. and Lorenzini, E. (2007). Phylogeny and molecular signatures (conserved proteins and indels) that are specific for the Bacteroidetes and Chlorobi species. BMC Evolutionary Biology. 7:71. doi:10.1186/1471-2148-7-71.〕 All of these results provide compelling evidence that the species from these three phyla shared a common ancestor exclusive of all other bacteria and it has been proposed that they should all recognized as part of a single “FCB”superphylum.〔〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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