- Dehalococcoides
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Dehalococcoides Scientific classification Domain: Bacteria Phylum: Chloroflexi Class: Dehalococcoidetes Genus: Dehalococcoides
Maymo-Gatell et al. 1997Species - D. ethenogenes
Dehalococcoides is a genus of bacteria within class Dehalococcoidetes that obtain energy via the oxidation of hydrogen gas and subsequent reductive dehalogenation of halogenated organic compounds.[1]
Contents
Reductive dehalogenation
The first member of the "Dehalococcoides" (DHC) group, "Dehalococcoides ethenogenes" strain 195 (DET) was described in 1997, and is noted for its potential use in the bioremediation of tetrachloroethene (PCE) and trichloroethene (TCE) contaminated ground water sites.[2][3] Additional DHC members were later described. These include CBDB1 [4], BAV1, VS, and GT. High DHC population numbers and electron substrate concentrations are necessary for effective bioremediation of dense non-aqueous phase liquids (DNAPL) contamination sites. Addition of either fermentable substrate to create hydrogen gas in situ, or inoculation of the site with mixed cultures containing Dehalococcoides are required for effective remediation.
Other dechlorinating microbes are also responsible for the PCE → TCE → 1,2-Dichloroethene (1,2-DCE) sequence of ethene dehalogenation,[2] but these organisms often fail to continue the degradation sequence from 1,2-DCE to vinyl chloride (VC), and finally, ethene (1,2-DCE → VC → ethene), which is environmentally benign. Dehalococcoides effectively converts 1,2-DCE to VC, and its presence in groundwater may be necessary for proper bioremediation of contaminated sites.
Mixed Dehalococcoides species can also bioremediate environmental sites contaminated with polychlorinated biphenyls (PCBs).[5]
References
- ^ See the NCBI webpage on Dehalococcoides. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. ftp://ftp.ncbi.nih.gov/pub/taxonomy/. Retrieved 2007-03-19.
- ^ a b 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.
- ^ Steele, Bill (2007-06-14). "Computer modeling could help chlorine-hungry bacteria break down toxic waste". Chronicle Online. Cornell University. http://www.news.cornell.edu/stories/June07/dehalococcoides.ws.html. Retrieved 2007-11-24.
- ^ Adrian L, Szewzyk U, Wecke J, Görisch H (2000). "Bacterial dehalorespiration with chlorinated benzenes". Nature 408 (6812): 580–583. doi:10.1038/35046063. PMID 11117744.
- ^ Bedard, Donna L.; Kirsti M. Ritalahti and Frank E. Löffler (April 2007). "The Dehalococcoides Population in Sediment-Free Mixed Cultures Metabolically Dechlorinates the Commercial Polychlorinated Biphenyl Mixture Aroclor 1260". Applied and Environmental Microbiology 73 (8): p. 2513–2521. doi:10.1128/AEM.02909-06. PMC 1855590. PMID 17308182. http://aem.asm.org/cgi/reprint/73/8/2513.pdf.
See also
External links
- PubMed references for Dehalococcoides
- PubMed Central references for Dehalococcoides
- Google Scholar references for Dehalococcoides
- NCBI taxonomy page for Dehalococcoides
- Search Tree of Life taxonomy pages for Dehalococcoides
- Search Species2000 page for Dehalococcoides
- MicrobeWiki page for Dehalococcoides
- LSPN page for Dehalococcoides
Categories:- Bacteria genera
- Bioremediation
- Bacteria stubs
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