Dehalococcoidia

Dehalococcoidia is a class of Chloroflexota, a phylum of Bacteria. It is also known as the DHC group.[3]

Dehalococcoidia
Scientific classification
Domain:
Bacteria
Phylum:
Chloroflexota
Class:
Dehalococcoidia

Löffler et al. 2013[1]
Order:
Dehalococcoidales

Löffler et al. 2013[1]
Family:
Dehalococcoidaceae

Löffler et al. 2013[1]
Genera
Synonyms
  • "Dehalococcoidetes" Hugenholtz and Stackebrandt 2004[2]

The name Dehalococcoidetes is a placeholder name given by Hugenholtz and Stackebrandt, 2004, after Dehalococcoides ethenogenes, a partially described species in 1997,[4] whereas the first species fully described belonging to this class was Dehalogenimonas lykanthroporepellens by Moe et al. 2009, but no emendations to the name were made.[5][6][7]

Characteristics

Both species, Dehalococcoides ethenogenes and Dehalogenimonas lykanthroporepellens are irregular coccus (coccoid) bacteria capable of dehalogenating polychlorinated aliphatic alkanes and alkenes, such as tetrachloroethene, trichloropropane, trichloroethane, dichloropropane, and dichloroethane.[8]

One of the features of the members of the phylum Chloroflexota is the unusual cell wall structure, which is monoderm but with great variation in presence or structure of the peptidoglycan resulting in many members staining Gram-negative and other Gram-positive.[9] Both species of Dehalococcoidetes stain Gram negative, but they potentially lack peptidoglycan and instead possess pseudopeptidoglycan (S-layer) (resistant to peptidoglycan-attacking antibiotics ampicillin and vancomycin; wheat germ agglutinin does not bind nor does lysozyme work).[4][5][10]

See also
  • Bioaugmentation

References
  1. Löffler FE, Yan J, Ritalahti KM, Adrian L, Edwards EA, Konstantinidis KT, Muller JA, Fullerton H, Zinder SH, Spormann AM. (2013). "Dehalococcoides mccartyi gen. nov., sp. nov., obligately organohalide-respiring anaerobic bacteria relevant to halogen cycling and bioremediation, belong to a novel bacterial class, Dehalococcoidia classis nov., order Dehalococcoidales ord. nov. and family Dehalococcoidaceae fam. nov., within the phylum Chloroflexi". Int J Syst Evol Microbiol. 63 (Pt 2): 625–635. doi:10.1099/ijs.0.034926-0. PMID 22544797.
  2. Hugenholtz, P.; Stackebrandt, E. (2004). "Reclassification of Sphaerobacter thermophilus from the subclass Sphaerobacteridae in the phylum Actinobacteria to the class Thermomicrobia (emended description) in the phylum Chloroflexi (emended description)". International Journal of Systematic and Evolutionary Microbiology. 54 (6): 2049–2051. doi:10.1099/ijs.0.03028-0. PMID 15545432.
  3. Lebron, C. A.; Petrovskis, E.; Loeffler, F. & Henn, K. (2011). "Guidance Protocol: Application of Nucleic Acid-Based Tools for Monitoring Monitored Natural Attenuation (MNA), Biostimulation, and Bioaugmentation at Chlorinated Solvent Sites" (PDF). {{cite journal}}: Cite journal requires |journal= (help)
  4. Maymo-Gatell, X.; Chien, Y.; Gossett, J. M.; Zinder, S. H. (1997). "Isolation of a Bacterium That Reductively Dechlorinates Tetrachloroethene to Ethene". Science. 276 (5318): 1568–1571. doi:10.1126/science.276.5318.1568. PMID 9171062.
  5. Moe W.M.; Yan J.; Nobre M.F.; Da Costa M.S.; Rainey F.A. (2009). "Dehalogenimonas lykanthroporepellens gen. nov., sp. nov., a reductively dehalogenating bacterium isolated from chlorinated solvent-contaminated groundwater". International Journal of Systematic and Evolutionary Microbiology. 59 (11): 2692–2697. doi:10.1099/ijs.0.011502-0. PMID 19625421.
  6. Classification entry in LPSN; Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". International Journal of Systematic and Evolutionary Microbiology. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. PMID 9103655.
  7. Dehalogenimonas entry in LPSN; Euzéby, J.P. (1997). "List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet". International Journal of Systematic and Evolutionary Microbiology. 47 (2): 590–2. doi:10.1099/00207713-47-2-590. PMID 9103655.
  8. Maymo-Gatell X, Chien Y, Gossett JM, Zinder SH (1997). "Isolation of a bacterium that reductively dechlorinates tetrachloroethene to ethene". Science. 276 (5318): 1568–1571. doi:10.1126/science.276.5318.1568. PMID 9171062.
  9. Don J. Brenner; Noel R. Krieg; James T. Staley (July 26, 2005) [1984(Williams & Wilkins)]. George M. Garrity (ed.). Introductory Essays. Bergey's Manual of Systematic Bacteriology. Vol. 2A (2nd ed.). New York: Springer. p. 304. ISBN 978-0-387-24143-2. British Library no. GBA561951.
  10. Fazi, S.; Aulenta, F.; Majone, M.; Rossetti, S. (2008). "Improved quantification of Dehalococcoides species by fluorescence in situ hybridization and catalyzed reporter deposition". Systematic and Applied Microbiology. 31 (1): 62–67. doi:10.1016/j.syapm.2007.11.001. PMID 18249080.


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