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Fibrobacter succinogenes : ウィキペディア英語版
Fibrobacter succinogenes

''Fibrobacter succinogenes'' is a cellulolytic bacterium species in the genus ''Fibrobacter''. It is present in the rumen of cattle. Beta glucans are its substrate of choice in the rumen and its products after digestion include formate, acetate and succinate. Fibrobacter succinogenes forms characteristic extensive grooves in crystalline cellulose, and is also rather readily detached from its substrate during sample preparation.
== Close relationship of ''Fibrobacter succinogenes'' to'' Bacteroidetes'' and ''Chlorobi'' phyla ==
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.〕 ''Fibrobacter succinogenes'' and the species from these two other 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 ''Fibrobacter succinogenes'' and all of the species from ''Bacteroidetes'' and ''Chlorobi'' 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 ''Fibrobacter succinogenes'' shared a common ancestor with ''Bacteroidetes'' and ''Chlorobi'' species exclusive of all other bacteria, and these species should be recognized as part of a single “FCB”superphylum.〔〔

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