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Abstract:

Temperature is one of the most important factors for bacterial growth and development. Cold environments are widely distributed on earth, and psychrotolerant and psychrophilic microorganisms have developed different adaptation strategies to cope with the stress derived from low temperatures. Pseudomonas extremaustralis is an Antarctic bacterium able to grow under low temperatures and to produce high amounts of polyhydroxyalkanoates (PHAs). In this work, we analyzed the genome-wide transcriptome by RNA deepsequencing technology of early exponential cultures of P. extremaustralis growing in LB (Luria Broth) supplemented with sodium octanoate to favor PHA accumulation at 8°C and 30°C. We found that genes involved in primary metabolism, including tricarboxylic acid cycle (TCA) related genes, as well as cytochromes and amino acid metabolism coding genes, were repressed at low temperature. Among up-regulated genes, those coding for transcriptional regulatory and signal transduction proteins were over-represented at cold conditions. Remarkably, we found that genes involved in ethanol oxidation, exaA, exaB and exaC, encoding a pyrroloquinoline quinone (PQQ)-dependent ethanol dehydrogenase, the cytochrome c550 and an aldehyde dehydrogenase respectively, were up-regulated. Along with RNA-seq experiments, analysis of mutant strains for pqqB (PQQ biosynthesis protein B) and exaA were carried out. We found that the exaA and pqqB genes are essential for growth under low temperature in LB supplemented with sodium octanoate. Additionally, prosaniline assay measurements showed the presence of alcohol dehydrogenase activity at both 8°C and 30°C, while the activity was abolished in a pqqB mutant strain. These results together with the detection of ethanol by gas chromatography in P. extremaustralis cultures grown at 8°C support the conclusion that this pathway is important under cold conditions. The obtained results have led to the identification of novel components involved in cold adaptation mechanisms in this bacterium, suggesting for the first time a role of the ethanol oxidation pathway for bacterial growth at low temperatures. © 2015 Tribelli et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Registro:

Documento: Artículo
Título:Novel essential role of ethanol oxidation genes at low temperature revealed by transcriptome analysis in the antarctic bacterium pseudomonas extremaustralis
Autor:Tribelli, P.M.; Venero, E.C.S.; Ricardi, M.M.; Gómez-Lozano, M.; Iustman, L.J.R.; Molin, S.; López, N.I.
Filiación:Departamento de Química Biológica, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Intendente Guiraldes 2160, Buenos Aires, C1428EGA, Argentina
IQUIBICEN, CONICET, Buenos Aires, Argentina
Facultad de Ciencias Exactas Y Naturales Biología Molecular y Neurociencias (IFIBYNE-CONICET), Instituto de Fisiología, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hrsholm, Denmark
Palabras clave:alcohol dehydrogenase; aldehyde dehydrogenase; cytochrome; transcriptome; tricarboxylic acid; alcohol; alcohol dehydrogenase; alcohol oxidation; amino acid metabolism; Article; azu gene; bacterial gene; bacterial growth; bacterial survival; cold acclimatization; controlled study; cyoA gene; cyoB gene; cyoC gene; cyoD gene; down regulation; enzyme activity; exaA gene; exaB gene; exaC gene; fleQ gene; flG gene; flH gene; flhA gene; fliF gene; fliG gene; fliM gene; flK gene; flL gene; gabD gene; gabT gene; gas chromatography; gene function; gene identification; genetic association; low temperature; mobA gene; mobB gene; nonhuman; potABCD gene; potFGHI gene; pqqB gene; protein metabolism; Pseudomonas; Pseudomonas extremaustralis; RNA analysis; RNA sequence; sequence analysis; signal transduction; strain identification; transcription regulation; transcriptomics; upregulation; Antarctica; bacterial gene; cold; gene expression profiling; gene expression regulation; genetics; growth, development and aging; metabolism; open reading frame; oxidation reduction reaction; Pseudomonas; software; Alcohol Dehydrogenase; Antarctic Regions; Cold Temperature; Ethanol; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Genes, Bacterial; Open Reading Frames; Oxidation-Reduction; Pseudomonas; Software; Up-Regulation
Año:2015
Volumen:10
Número:12
DOI: http://dx.doi.org/10.1371/journal.pone.0145353
Título revista:PLoS ONE
Título revista abreviado:PLoS ONE
ISSN:19326203
CODEN:POLNC
CAS:alcohol dehydrogenase, 9031-72-5; aldehyde dehydrogenase, 37353-37-0, 9028-86-8; alcohol, 64-17-5; Alcohol Dehydrogenase; Ethanol
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19326203_v10_n12_p_Tribelli

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Citas:

---------- APA ----------
Tribelli, P.M., Venero, E.C.S., Ricardi, M.M., Gómez-Lozano, M., Iustman, L.J.R., Molin, S. & López, N.I. (2015) . Novel essential role of ethanol oxidation genes at low temperature revealed by transcriptome analysis in the antarctic bacterium pseudomonas extremaustralis. PLoS ONE, 10(12).
http://dx.doi.org/10.1371/journal.pone.0145353
---------- CHICAGO ----------
Tribelli, P.M., Venero, E.C.S., Ricardi, M.M., Gómez-Lozano, M., Iustman, L.J.R., Molin, S., et al. "Novel essential role of ethanol oxidation genes at low temperature revealed by transcriptome analysis in the antarctic bacterium pseudomonas extremaustralis" . PLoS ONE 10, no. 12 (2015).
http://dx.doi.org/10.1371/journal.pone.0145353
---------- MLA ----------
Tribelli, P.M., Venero, E.C.S., Ricardi, M.M., Gómez-Lozano, M., Iustman, L.J.R., Molin, S., et al. "Novel essential role of ethanol oxidation genes at low temperature revealed by transcriptome analysis in the antarctic bacterium pseudomonas extremaustralis" . PLoS ONE, vol. 10, no. 12, 2015.
http://dx.doi.org/10.1371/journal.pone.0145353
---------- VANCOUVER ----------
Tribelli, P.M., Venero, E.C.S., Ricardi, M.M., Gómez-Lozano, M., Iustman, L.J.R., Molin, S., et al. Novel essential role of ethanol oxidation genes at low temperature revealed by transcriptome analysis in the antarctic bacterium pseudomonas extremaustralis. PLoS ONE. 2015;10(12).
http://dx.doi.org/10.1371/journal.pone.0145353