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Título : Genomics of the Proteorhodopsin-Containing Marine Flavobacterium Dokdonia sp. Strain MED134
Autor : González, José M., Fernández-Gómez, Beatriz, Coll-Lladó, Montserrat, Fernàndez-Guerra, Antoni, Pedrós-Alió, Carlos
Fecha de publicación : Dec-2011
Editor: American Society for Microbiology
Citación : Applied and Environmental Microbiology 77(24): 8676–8686 (2011)
Resumen: Proteorhodopsin phototrophy is expected to have considerable impact on the ecology and biogeochemical roles of marine bacteria. However, the genetic features contributing to the success of proteorhodopsin-containing bacteria remain largely unknown. We investigated the genome of Dokdonia sp. strain MED134 (Bacteroidetes) for features potentially explaining its ability to grow better in light than darkness. MED134 has a relatively high number of peptidases, suggesting that amino acids are the main carbon and nitrogen sources. In addition, MED134 shares with other environmental genomes a reduction in gene copies at the expense of important ones, like membrane transporters, which might be compensated by the presence of the proteorhodopsin gene. The genome analyses suggest Dokdonia sp. MED134 is able to respond to light at least partly due to the presence of a strong flavobacterial consensus promoter sequence for the proteorhodopsin gene. Moreover, Dokdonia sp. MED134 has a complete set of anaplerotic enzymes likely to play a role in the adaptation of the carbon anabolism to the different sources of energy it can use, including light or various organic matter compounds. In addition to promoting growth, proteorhodopsin phototrophy could provide energy for the degradation of complex or recalcitrant organic matter, survival during periods of low nutrients, or uptake of amino acids and peptides at low concentrations. Our analysis suggests that the ability to harness light potentially makes MED134 less dependent on the amount and quality of organic matter or other nutrients. The genomic features reported here may well be among the keys to a successful photoheterotrophic lifestyle
Descripción : González, José M. ... et al.-- 12 pages, 8 figures, 1 table, supplemental material for this article may be found at http://aem.asm.org/content/77/24/8676/suppl/DC1
Versión del editor: http://dx.doi.org/10.1128/AEM.06152-11
URI : http://hdl.handle.net/10261/49478
ISSN: 0099-2240
DOI: 10.1128/AEM.06152-11
Citación : Applied and Environmental Microbiology 77(24): 8676–8686 (2011)
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