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Unravelling the adaptation responses to osmotic and temperature stress in Chromohalobacter salexigens, a bacterium with broad salinity tolerance

Opened Access Unravelling the adaptation responses to osmotic and temperature stress in Chromohalobacter salexigens, a bacterium with broad salinity tolerance

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Autor: Nieto Gutiérrez, Joaquín José
Vargas, C.
Argandoña Bertrán, Montserrat
Reina Bueno, Mercedes
Rodríguez Moya, Javier
Fernández Aunión, Cristina
Departamento: Universidad de Sevilla. Departamento de Microbiología y Parasitología
Fecha: 2008
Publicado en: Saline Systems, 4,  14
Tipo de documento: Artículo
Resumen: Chromohalobacter salexigens, a Gammaproteobacterium belonging to the family Halomonadaceae, shows a broad salinity range for growth. Osmoprotection is achieved by the accumulation of compatible solutes either by transport (betaine, choline) or synthesis (mainly ectoine and hydroxyectoine). Ectoines can play additional roles as nutrients and, in the case of hydroxyectoine, in thermotolerance. A supplementary solute, trehalose, not present in cells grown at 37°C, is accumulated at higher temperatures, suggesting its involvement in the response to heat stress. Trehalose is also accumulated at 37°C in ectoine-deficient mutants, indicating that ectoines suppress trehalose synthesis in the wild-type strain. The genes for ectoine (ectABC) and hydroxyectoine (ectD, ectE) production are arranged in three different clusters within the C. salexigens chromosome. In order to cope with changing environment, C. salexigens regulates its cytoplasmic pool of ectoines by a number of mechanisms that we h...
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Tamaño: 3.262Mb
Formato: PDF

URI: http://hdl.handle.net/11441/38266

DOI: http://dx.doi.org/10.1186/1746-1448-4-14

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