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Quorum Sensing Circuit and Reactive Oxygen Species Resistance in Deinococcus sp.

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Abstract

Genus Deinococcus is characterized by an increased resistance toward reactive oxygen species (ROS). The chromosome of five strains belonging to this genus has been sequenced and the presence of a luxS-like gene was deduced from their genome sequences. The aim of this study was to assess if a complete QS circuit is present in Deinococcus sp. and if this QS is associated with ROS. Primers for searching luxS-like gene and the putative receptor gene, namely ai2R, were designed. AI-2 signal production was evaluated by luminescence analysis using Vibrio harveyi BB170 as reporter strain. AI-2 signal was also evaluated by competitive assays using cinnamaldehyde, ascorbic acid, and 3-mercaptopropionic acid as interfering molecules. Potassium tellurite and metronidazole were used as oxidative stressors. A luxS-like gene as well as an ai2R gene was detected in strain UDEC-P1 by PCR. Cell-free supernatant of strain UDEC-P1 culture induced luminescence in V. harveyi BB170, and this property was inhibited with the three interfering molecules. The oxidative stressors metronidazole and potassium tellurite decreased Deinococcus sp. viability, but increased luminescence of the reporter strain. The results demonstrate that both a functional luxS-like gene and a putative receptor for AI-2 signal are present in Deinococcus sp. strain UDEC-P1. This finding also suggests that a complete QS circuit is present in this genus, which could be related to oxidative stress.

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Acknowledgments

This work was supported by FONDECYT, Grant Nº 1100462. The Authors thank Miss Ruth Contreras for her technical support, and Mrs. Maria E. Larenas for her critical review of language proficiency.

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Authors and Affiliations

  1. Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile

    G. Fernandez-Bunster, C. Gonzalez, J. Barros & M. Martinez

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  1. G. Fernandez-Bunster
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  2. C. Gonzalez
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  3. J. Barros
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  4. M. Martinez
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Correspondence to M. Martinez.

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Fernandez-Bunster, G., Gonzalez, C., Barros, J. et al. Quorum Sensing Circuit and Reactive Oxygen Species Resistance in Deinococcus sp.. Curr Microbiol 65, 719–725 (2012). https://doi.org/10.1007/s00284-012-0225-1

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  • DOI: https://doi.org/10.1007/s00284-012-0225-1

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