Pseudoalteromonas haloplanktis TAC125

Pseudoalteromonas_haloplanktis
Names Pseudoalteromonas haloplanktis TAC125
Accession numbers NC_007481, NC_007482
Background Pseudoalteromonas haloplanktis TAC125 is a fast growing gammaproteobacterium isolated from an Antarctic coastal sea water sample collected near the French Antarctic station Dumont d'Urville, Terre Adelie. It harbors two chromosomes. The second one does not display a standard GC skew. It is probably due to an unidirectional replication and this is supported by the signature of R1 plasmid replication. A third of the genes of chromosome II have orthologs in E.coli and nineteen percent show high similarities with plasmid-encoded genes. This suggests that this replicon was a plasmid recruited to become a chromosome. rRNA sequences place TAC125 near vibrios and Shewanella. Likewise, the quite high number of tRNA genes (106 genes) is a feature found in Vibrios and P.profundum. Seventy-two percent of the tRNA genes are located in the leading strand. The large number of tRNA and rRNA genes may ensure a fast growth despite the reduced speed of transcription/translation at low temperature. The RNA/nucleoid-associated cold-shock gene hns, which is ubiquitous in gammaproteobacteria, is absent. P.haloplanktis has to cope with increased oxygen solubility and interaction with reduced iron that leads to the deleterious Fenton reaction and reactive oxygen species (ROS). Using directly dioxygen is a way to protect the metabolism against those effects and numerous putative dioxygenases have been identified. Another sign that it is well equipped to deal with problems posed by ROS is the presence of several proteins involved in scavenging the chemical groups affected. It is unable to grow on glucose. Type II secretion system and TAT system are functional but type III secretion system is absent. (EBI Integr8)
Taxonomy
Kingdom:Bacteria
Phylum:Proteobacteria
Class:Gammaproteobacteria
Order:Alteromonadales
Family:Pseudoalteromonadaceae
Genus:Pseudoalteromonas
Species:haloplanktis
Strain TAC125
Complete Yes
Sequencing centre (06-OCT-2005) National Center for Biotechnology Information, NIH, Bethesda, MD 20894, USA
(26-APR-2005) Genoscope, Centre National de Sequencage, BP 191, Evry cedex 91006, France
Sequencing quality Level 6: Finished
Sequencing depth NA
Sequencing method NA
Isolation site Coastal sea water near a French Antarctic station, Adelia Land
Isolation country NA
Number of replicons 2
Gram staining properties Negative
Shape Bacilli
Mobility No
Flagellar presence Yes
Number of membranes 2
Oxygen requirements Aerobic
Optimal temperature NA
Temperature range Psychrophilic
Habitat Aquatic
Biotic relationship Free living
Host name NA
Cell arrangement NA
Sporulation Nonsporulating
Metabolism NA
Energy source NA
Diseases NA
Pathogenicity No