Polynucleobacter

Polynucleobacter
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Betaproteobacteria
Order: Burkholderiales
Family: Burkholderiaceae
Genus: Polynucleobacter

Heckmann & Schmidt 1987,
emend. Hahn et al. 2009

Type species
Polynucleobacter necessarius
Species

P. acidiphobus Hahn et al. 2011
P. cosmopolitanus Hahn et al. 2010
P. difficilis Hahn et al. 2012
P. necessarius Heckm. & Sch. 1987
P. rarus Hahn et al. 2011

Polynucleobacter is a genus of Proteobacteria, originally established by Heckmann and Schmidt (1987) [1] to exclusively harbor obligate endosymbionts of ciliates belonging to the genus Euplotes.

Recently, four new Polynucleobacter species were described,[2][3][4][5] which all represent free-living (i.e. not host-associated) planktonic freshwater bacteria. Furthermore, the first described species covers both obligate endosymbionts and free-living planktonic strains.[6]

Free-living Poynucleobacter bacteria represent important members of bacterioplankton in freshwater systems such as lakes, ponds, and streams.

Genomics

Two genome projects are finished on P. necessarius strains: one project on an obligately freeliving strain isolated from an acidic freshwater pond,[7] and one project on an obligate endosymbiont of the ciliate Euplotes aediculatus [8]

Analyses of the genome sequences resulted in the discovery of a conserved RNA motif.

References

  1. ↑ Heckmann, K. and H. J. Schmidt (1987) Polynucleobacter necessarius gen. nov., sp. nov., an obligately endosymbiotic bacterium living in the cytoplasm of Euplotes aediculatus. Int. J. Syst. Bacteriol. 37:456-457. (doi: 10.1099/00207713-37-4-456)
  2. ↑ Hahn, M.W., E. Lang, U. Brandt, H. Lünsdorf, Q. L. Wu, and E. Stackebrandt (2010) Polynucleobacter cosmopolitanus sp. nov., free-living planktonic bacteria inhabiting freshwater lakes and rivers. Int. J. Syst. Evol. Microbiol. 60:166-173. (doi:10.1099/ijs.0.010595-0)
  3. ↑ Hahn, M.W., E. Lang, U. Brandt, and C. Spröer (2011) Polynucleobacter acidiphobus sp. nov., a representative of an abundant group of planktonic freshwater bacteria. Int. J. Syst. Evol. Microbiol. 61:788-794. (doi:10.1099/ijs.0.023929-0)
  4. ↑ Hahn, M.W., E. Lang, M. Tarao, and U. Brandt (2011) Polynucleobacter rarus sp. nov., a free-living planktonic bacterium isolated from an acidic lake. Int. J. Syst. Evol. Microbiol. 61:781-787 (doi:10.1099/ijs.0.017350-0)
  5. ↑ Hahn,M.W., A. Minasyan, E. Lang, U. Koll, and C. Spröer (2012) Polynucleobacter difficilis sp. nov., a planktonic freshwater bacterium affiliated with subclustr B1 of the genus Polynucleobacter. Int. J. Syst. Evol. Microbiol. 62:376-383. (doi:10.1099/ijs.0.031393-0)
  6. ↑ Hahn,M.W., E. Lang, U. Brandt, Q. L. Wu, and T. Scheuerl (2009) Emended description of the genus Polynucleobacter and the species Polynucleobacter necessarius and proposal of two subspecies, P. necessarius subsp. necessarius subsp. nov. and P. necessarius subsp. asymbioticus subsp. nov. Int. J Syst. Evol. Microbiol. 59:2002-2009. (doi:10.1099/ijs.0.005801-0)
  7. ↑ GOLD CARD: Gc00537 Genome project: Polynucleobacter necessarius subsp. asymbioticus QLW-P1DMWA-1, GOLD - Genomes OnLine Database
  8. ↑ GOLD CARD: Gc00757 Genome project: Polynucleobacter necessarius subsp. necessarius STIR1, GOLD - Genomes OnLine Database

External links