Paracoccus denitrificans

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Paracoccus denitrificans
Systematics
Department : Proteobacteria
Class : Alphaproteobacteria
Order : Rhodobacterales
Family : Rhodobacteraceae
Genre : Paracoccus
Type : Paracoccus denitrificans
Scientific name
Paracoccus denitrificans
( Beijerinck & Minkman 1910) Davis 1969

Paracoccus denitrificans is an immobile, coccoides , gram-negative bacterium found in soil, sewage, or sewage sludge . It wasisolated from garden soilas Micrococcus denitrificans by Martinus Beijerinck in 1910 . The genus Paracoccus was founded in 1969 by Davis et al. created with Paracoccus denitrificans as the type species.

The facultative anaerobic , facultative chemolithoautotrophic , non- fermenting bacterium is phylogenetically assigned according to its 16S rRNA sequence to the α 3 subgroup (Rhodobacter group) of the proteobacteria (purple bacteria), to which the photosynthetic bacteria Rhodobacter sphaeroides and Rhodobacter capsulatus also belong.

Under anaerobic conditions in the presence of nitrates , uses P. denitrificans for its energy metabolism , the denitrification , hence the species name. P. denitrificans can also live in the complete absence of organic substances, with hydrogen (H 2 ) as the substrate for the energy metabolism and carbon dioxide (CO 2 ) as the substrate for the building metabolism , which is called chemolithoautotrophy.

The aerobic respiratory chain of P. denitrificans is very similar to the respiratory chain of the mitochondria , which, according to the endosymbiotic theory, emerged from a common ancestor.

The genome of P. denitrificans was sequenced in 2004 .

swell

  1. ↑ Beijerinck, MW and Minkman, DCJ (1910): Formation and consumption of nitrogen oxide by bacteria . In: Zentralblatt für Bakteriologie, Parasitenkunde and Infectious Diseases and Hygiene, Division II . Vol. 25, pp. 30-63.
  2. ↑ Davis, DH et al. (1969): Proposal to reject the genus Hydrogenomonas: taxonomic implications . In: Int. J. Syst. Bacteriol. Vol. 19, pp. 375-390.
  3. ↑ John, P. and Whatley, FR (1975): Paracoccus denitrificans and the evolutionary origin of the mitochondrion . In: Nature . Vol. 254, No. 5500, pp. 495-498, PMID 235742 .
  4. ↑ Paracoccus denitrificans 1222 analysis files ( Memento of October 14, 2006 in the Internet Archive )

literature

  • Baker, SC et al . (1998): Molecular genetics of the genus Paracoccus: metabolically versatile bacteria with bioenergetic flexibility . In: Microbiol. Mol. Biol. Rev. Vol. 62, No. 4, pp. 1046-1078. PMID 9841665 PDF ( Memento from September 13, 2006 in the Internet Archive )
  • van Verseveld, HW and Stouthamer, AH (1999). The genus Paracoccus . In: The Prokaryotes . 3rd edition, release 3.0. Springer Publishing, New York.
  • Kelly, DP et al. (2006): Redefining Paracoccus denitrificans and Paracoccus pantotrophus and the case for a reassessment of the strains held by international culture collections . In: Int. J. Syst. Evol. Microbiol . Vol. 56, pp. 2495-2500. PMID 17012585