Modulibacteria

Modulibacteria 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).

Taxonomy

The following taxonomy was proposed by Sekiguchi et al (2015)[5]

  • Class Moduliflexia
    • Order Moduliflexales
      • Family Moduliflexaceae
        • Genus Moduliflexus
          • Species Moduliflexus flocculans
  • Class Vecturitrichia
    • Order Vecturatrichales
      • Family Vecturatrichaceae
        • Genus Vecturithrix
          • Species Vecturithrix granuli

References
  1. Yamada, Takeshi; Yamauchi, Toshihiro; Shiraishi, Koji; Hugenholtz, Philip; Ohashi, Akiyoshi; Harada, Hideki; Kamagata, Yoichi; Nakamura, Kazunori; Sekiguchi, Yuji (2007-05-31). "Characterization of filamentous bacteria, belonging to candidate phylum KSB3, that are associated with bulking in methanogenic granular sludges". The ISME Journal. 1 (3): 246–255. doi:10.1038/ismej.2007.28. ISSN 1751-7362. PMID 18043635.
  2. Yamada, Takeshi; Kikuchi, Kae; Yamauchi, Toshihiro; Shiraishi, Koji; Ito, Tsukasa; Okabe, Satoshi; Hiraishi, Akira; Ohashi, Akiyoshi; Harada, Hideki; Kamagata, Yoichi; Nakamura, Kazunori (2011-01-21). "Ecophysiology of Uncultured Filamentous Anaerobes Belonging to the Phylum KSB3 That Cause Bulking in Methanogenic Granular Sludge". Applied and Environmental Microbiology. 77 (6): 2081–2087. doi:10.1128/aem.02475-10. ISSN 0099-2240. PMC 3067334. PMID 21257808.
  3. Ley, Ruth E.; Harris, J. Kirk; Wilcox, Joshua; Spear, John R.; Miller, Scott R.; Bebout, Brad M.; Maresca, Julia A.; Bryant, Donald A.; Sogin, Mitchell L.; Pace, Norman R. (2006-05-01). "Unexpected Diversity and Complexity of the Guerrero Negro Hypersaline Microbial Mat". Applied and Environmental Microbiology. 72 (5): 3685–3695. doi:10.1128/AEM.72.5.3685-3695.2006. ISSN 0099-2240. PMC 1472358. PMID 16672518.
  4. Tanner, Michael (2006). "Complex Microbial Communities Inhabiting Sulfide-rich Black Mud from Marine Coastal Environments". Biotechnology et Alia. 8: 1–16.
  5. Sekiguchi, Yuji; Ohashi, Akiko; Parks, Donovan H.; Yamauchi, Toshihiro; Tyson, Gene W.; Hugenholtz, Philip (2015-01-27). "First genomic insights into members of a candidate bacterial phylum responsible for wastewater bulking". PeerJ. 3: e740. doi:10.7717/peerj.740. ISSN 2167-8359. PMC 4312070. PMID 25650158.
  6. Bik, Elisabeth M.; Costello, Elizabeth K.; Switzer, Alexandra D.; Callahan, Benjamin J.; Holmes, Susan P.; Wells, Randall S.; Carlin, Kevin P.; Jensen, Eric D.; Venn-Watson, Stephanie; Relman, David A. (2016-02-03). "Marine mammals harbor unique microbiotas shaped by and yet distinct from the sea". Nature Communications. 7 (1): 10516. Bibcode:2016NatCo...710516B. doi:10.1038/ncomms10516. ISSN 2041-1723. PMC 4742810. PMID 26839246.
  7. Dudek, Natasha K.; Sun, Christine L.; Burstein, David; Kantor, Rose S.; Aliaga Goltsman, Daniela S.; Bik, Elisabeth M.; Thomas, Brian C.; Banfield, Jillian F.; Relman, David A. (2017-12-18). "Novel Microbial Diversity and Functional Potential in the Marine Mammal Oral Microbiome". Current Biology: CB. 27 (24): 3752–3762.e6. doi:10.1016/j.cub.2017.10.040. ISSN 1879-0445. PMID 29153320.
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