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Open Access item Genome analysis of the proteorhodopsin-containing marine bacterium Polaribacter sp. MED152 (Flavobacteria)

Authors:González, José M.
Fernández-Gómez, Beatriz
Fernàndez-Guerra, Antoni
Gómez-Consarnau, Laura
Sánchez, Olga
Coll-Lladó, Montserrat
Campo, Javier del
Escudero, Lorena
Rodríguez-Martínez, Raquel
Alonso-Sáez, Laura
Latasa, Mikel
Paulsen, Ian
Nedashkovskaya, Olga
Lekunberri, Itziar
Pinhassi, Jarone
Pedrós-Alió, Carlos
Keywords:Bacteroidetes, marine bacteria, whole-genome analysis, heterotrophic CO2 fixation
Issue Date:13-Jun-2008
Publisher:National Academy of Sciences (U.S.)
Citation:Proceedings of the National Academy of Sciences 105(25): 8724-8729 (2008)
Abstract:Analysis of marine cyanobacteria and proteobacteria genomes has provided a profound understanding of the life strategies of these organisms and their ecotype differentiation and metabolisms. However, a comparable analysis of the Bacteroidetes, the third major bacterioplankton group, is still lacking. In the present paper, we report on the genome of Polaribacter sp. strain MED152. On the one hand, MED152 contains a substantial number of genes for attachment to surfaces or particles, gliding motility, and polymer degradation. This agrees with the currently assumed life strategy of marine Bacteroidetes. On the other hand, it contains the proteorhodopsin gene, together with a remarkable suite of genes to sense and respond to light, which may provide a survival advantage in the nutrient-poor sun-lit ocean surface when in search of fresh particles to colonize. Furthermore, an increase in CO2 fixation in the light suggests that the limited central metabolism is complemented by anaplerotic inorganic carbon fixation. This is mediated by a unique combination of membrane transporters and carboxylases. This suggests a dual life strategy that, if confirmed experimentally, would be notably different from what is known of the two other main bacterial groups (the autotrophic cyanobacteria and the heterotrophic proteobacteria) in the surface oceans. The Polaribacter genome provides insights into the physiological capabilities of proteorhodopsin-containing bacteria. The genome will serve as a model to study the cellular and molecular processes in bacteria that express proteorhodopsin, their adaptation to the oceanic environment, and their role in carbon-cycling.
Description:6 pages, 4 figures, 1 table.-- PMID: 18552178 [PubMed].-- Printed version published Jun 24, 2008.-- Supporting information available at: http://www.pnas.org/content/105/25/8724/suppl/DCSupplemental
Full-text available Open Access at the journal site.
Publisher version (URL):http://dx.doi.org/10.1073/pnas.0712027105
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