Colwellia psychrerythraea

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Template:Biorealm genus

Classification

Higher order taxa

Bacteria; Proteobacteria; Gammaproteobacteria; Alteromonadales; Colwelliaceae; Colwellia

Genus

Colwellia psychrerythraea

Strain: 34H / ATCC BAA-681

NCBI: Taxonomy

Description and significance

Colwellia psychrerythraea is considered an obligate psychrophile and appears rod-shaped and red in pigment. This flagella-containing organism can be found in continually cold marine environments including Arctic and Antarctic sea ice. Strain 34H, in particular, was isolated from Arctic marine sediments. It has a growth temperature range of -1°C to 10°C. Optimal growth appears at 8°C, with maximum cell yield occurring at the subzero temperature of -1°C. Cells are able to swim in temperatures as low as -10°C. Growth can occur under deep sea pressures as well.

Sequence completion of this genome has revealed Colwellia's significant role in bioremediation, carbon and nutrient cycling, production of secondary metabolites, and cold-adapted enzymes. C. psychrerythraea is considered a model organism for the study of life in permanently cold environments, specifically bacterial adaptations. These adaptations include production of extracellular polymeric material for purposes of biofilm formation and cryoprotection, as well as enzymes with the ability to breakdown high-molecular-weight organic compounds. Particularly unique to this organism is the production of cold-active enzymes which show distinct heat instability and optimal activity occurring at low temperatures. These features make Colwellia species important in carbon and nutrient cycling in the cold marine environments in which they inhabit. From contaminated sediments to ice formations, observation of this organism can possibly give insight into earlier Earth environments as well as those on other planets and moons.

Genome structure

The complete genome of Colwellia psychrerythraea 34H has been sequenced and shown to be 5,373,180 nucleotides in length. The genome consists of one circular chromosome which codes for 117 structural RNAs and 4910 proteins. The circular DNA contains 38% guanine-cytosine base pairing.

Cell structure and metabolism

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Ecology

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Pathology

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Application to Biotechnology

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Current Research

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References

example:

Glockner, F. O., M. Kube, M. Bauer, H. Teeling, T. Lombardot, W. Ludwig, D. Gade, A. Beck, K Borzym, K Heitmann, R. Rabus, H. Schlesner, R. Amann, and R. Reinhardt. 2003. "Complete genome sequence of the marine planctomycete Pirellula sp. strain 1." Proceedings of the National Acedemy of Sciences, vol. 100, no. 14. (8298-8303)


Edited by student of Rachel Larsen and Kit Pogliano