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Plasmid diversity in arctic strains of Psychrobacter spp.

Dziewit, Lukasz and Cegielski, A and Romaniuk, K and Uhrynowski, W and Szych, A and Niesiobecki, P and Żmuda-Baranowska, Magdalena J and Zdanowski, Marek K and Bartosik, Dariusz (2013) Plasmid diversity in arctic strains of Psychrobacter spp. Extremophiles, 17 (3). pp. 433-444. ISSN 1431-0651

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Official URL: http://link.springer.com/article/10.1007%2Fs00792-...


Six strains of Psychrobacter spp. isolated from guano of little auks collected on Spitsbergen island (Arctic) carried nine plasmids that were fully sequenced. These replicons (ranging in size from 2917 to 14924 bp) contained either repA (ColE2-type) or repB (iteron-type) replication systems of a relatively narrow host range, limited to Psychrobacter spp. All but one of the plasmids carried predicted mobilization for conjugal transfer systems, encoding relaxases of the MOBQ, MOBV or MOBP families. The plasmids also contained diverse additional genetic load, including a type II restriction-modification system and a gene encoding a putative subunit C of alkyl hydroperoxide reductase (AhpC)-an antioxidant enzyme and major scavenger of reactive oxygen species. Detailed comparative sequence analyses, extended to all plasmids identified so far in psychrophilic bacteria, distinguished groups of the most ubiquitous replicons, which play a key role in horizontal gene transfer in cold environments.

Item Type:Article
Subjects:Q Science > QR Microbiology
Divisions:Department of Antarctic Biology
ID Code:679
Deposited By: prof. Marek K Zdanowski
Deposited On:18 Apr 2014 07:30
Last Modified:18 Apr 2014 07:30

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