Coping with cold: The genome of the versatile marine Antarctica bacterium Pseudoalteromonas haloplanktis TAC125

peer reviewed A considerable fraction of life develops in the sea at temperatures lower than 15 degrees C. Little is known about the adaptive features selected under those conditions. We present the analysis of the genome Sequence of the fast growing Antarctica bacterium Pseudoalteromonas haloplankt...

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Bibliographic Details
Published in:Genome Research
Main Authors: Medigue, C., Krin, E., Pascal, G., Barbe, V., Bernsel, A., Bertin, P. N., Cheung, F., Cruveiller, S., D'Amico, Salvino, Duilio, A., Fang, G., Feller, Georges, Ho, C., Mangenot, S., Marino, G., Nilsson, J., Parrilli, E., Rocha, E. P. C., Rouy, Z., Sekowska, A., Tutino, M. L., Vallenet, D., von Heijne, G., Danchin, A.
Format: Article in Journal/Newspaper
Language:English
Published: Cold Spring Harbor Lab Press, Publications Dept 2005
Subjects:
Life sciences
Biochemistry
biophysics & molecular biology
Microbiology
Biotechnology
Sciences du vivant
Biochimie
biophysique & biologie moléculaire
Microbiologie
Biotechnologie
Antarc*
Antarctica
Online Access:https://orbi.uliege.be/handle/2268/15455
https://orbi.uliege.be/bitstream/2268/15455/1/GenRes_MedigueTAC125_2005.pdf
https://doi.org/10.1101/gr.4126905
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Summary:peer reviewed A considerable fraction of life develops in the sea at temperatures lower than 15 degrees C. Little is known about the adaptive features selected under those conditions. We present the analysis of the genome Sequence of the fast growing Antarctica bacterium Pseudoalteromonas haloplanktis TAC125. We find that it copes with the increased Solubility of oxygen at low temperature by multiplying dioxygen scavenging while deleting whole pathways producing reactive oxygen species. Dioxygen-consuming lipid desaturases achieve both protection against oxygen and synthesis of lipids making the membrane fluid. A remarkable strategy for avoidance of reactive oxygen species generation is developed by A haloplanktis, with elimination of the ubiquitous molybdopterin-dependent metabolism. The A haloplanktis proteome reveals a concerted amino acid usage bias specific to psychrophiles, consistently appearing apt to accommodate asparagine, a residue prone to make proteins age. Adding to its originality, A haloplanktis further differs from its marine Counterparts with recruitment of a plasmid origin of replication for its second chromosome.

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