Aeropyrum pernix

From Citizendium, the Citizens' Compendium
Jump to: navigation, search
This article is developing and not approved.
Main Article
Talk
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.
Aeropyrum pernix
Scientific classification
Kingdom: Archaea
Phylum: Crenarchaeota
Class: Thermoprotei
Order: Desulfurococcales
Family: Desulfurococcaceae
Genus: Aeropyrum
Species: A. pernix
Binomial name
Aeropyrum pernix
Sako et al. 1996

Aeropyrum pernix is a heat-requiring extremophile species of Archaea, (procaryotes with a different ancestry than ordinary bacteria--and possibly everything else). It was the first strictly aerobic hyperthermophilic Archaea to be discovered.

Properties

Aeropyrum pernix appears as mostly regular cocci of 0.8 µm to 1.2 µm diameter. It grows between 70 ºC and 100 ºC (with an optimum temperature of 90-95 ºC), pH 5 to 9 (with an optimum at pH 7) and at 1.8 to 7.0% salinity (optimum, 3.5% salinity). It grows well on proteinaceous substrates, with a doubling time of approximately 200 minutes.

Discovery

Aeropyrum pernix was originally isolated aerobically from heated marine sediments and venting water collected at a solfataric vent off Kodakara-Jima Island, Japan.

Genome

The complete genome of Aeropyrum pernix has 1,669 kilobases, for 2,694 open reading frames (ORFs) were assigned. All the genes in the TCA cycle were found except for that of α-ketoglutarate dehydrogenase . In its place, the genes coding for the two subunits of 2-oxoacid:ferredoxin oxidoreductase were identified.

References

  • Sako Y et al. (1996) Aeropyrum pernix gen. nov., sp. nov., a novel aerobic hyperthermophilic archaeon growing at temperatures up to 100 degrees C. Int J Syst Bacteriol46:1070-7.
  • Kawarabayasi et al. (1999) Complete Genome Sequence of an Aerobic Hyper-thermophilic Crenarchaeon, Aeropyrum pernix K1. DNA Research 6:83-101