Modulibacteria | |
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Scientific classification | |
Domain: | |
Phylum: | "Modulibacteria"
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Class: | "Moduliflexia"
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Order: | "Moduliflexales"
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Family: | "Moduliflexaceae" Sekiguchi et al. 2015
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Genus | |
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Modulibacteria(Moduliflexota) is a bacterial phylum formerly known as KS3B3 or GN06. It is a candidate phylum, meaning there are no cultured representatives of this group. Members of the Modulibacteria phylum are known to cause fatal filament overgrowth (bulking) in high-rate industrial anaerobic wastewater treatment bioreactors.[1][2]
The Modulibacteria phylum was first proposed in 2006 by two independent research groups based on analyses of 16S rRNA gene sequences. One group recovered Modulibacteria sequences from the a hypersaline microbial mat from Guerrero Negro (Baja California Sur, Mexico) and used the provisional name GN06 for the novel phylum,[3] while the other recovered sequences from sulfur-rich black mud marine sediments (CA, USA) and used the provisional name KSB3.[4]
The first genomic insights into the phylum were achieved in 2015, at which time the name "Modulibacteria" was proposed.[5] Two genomes were recovered from methanogenic sludge samples of a full-scale upflow anaerobic sludge blanket (UASB) reactor treating a high-strength organic wastewater discharged from a food-processing factory.
Through a combination of genome-based metabolic reconstruction and microscopic observation, it was determined that the two studied Modulibacteria species (Moduliflexus flocculans and Vecturithrix granuli) produce filamentous structures and are Gram-negative, strictly anaerobic fermenters capable of non-flagellar based gliding motility. Both have an unusually large number of sensory and response regulator genes compared to other bacteria.[5]
Members of the Modulibacteria phylum have been detected in a variety of environments in addition to bioreactors and hypersaline mats, such as wetland sediments (FJ516883.1), the dolphin mouth,[6][7] and a tubeworm from a coldseep (FM165273).
The following taxonomy was proposed by Sekiguchi et al. 2015[5][8] and phylogeny by GTDB 08-RS214[9][10][11]