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Título: | Mini-Tn7 vectors for stable expression of diguanylate cyclase PleD* in Gram-negative bacteria |
Autor: | Romero-Jiménez, Lorena CSIC; Rodríguez-Carbonell, David CSIC; Gallegos, María Trinidad CSIC ORCID ; Sanjuán, Juan CSIC ORCID; Pérez-Mendoza, Daniel CSIC ORCID | Palabras clave: | c-di-GMP Mini-Tn7 Signal transduction Biofilms Exopolysaccharide production Bacterial motility Plasmid stability |
Fecha de publicación: | 29-sep-2015 | Editor: | BioMed Central | Citación: | BMC Microbiology 15(1): 190 (2015) | Resumen: | [Background] The cyclic diguanylate (c-di-GMP) is currently considered an ubiquitous second messenger in bacteria that influences a wide range of cellular processes. One of the methodological approaches to unravel c-di-GMP regulatory networks involves raising the c-di-GMP intracellular levels, e.g. by expressing a diguanylate cyclase (DGC), to provoke phenotypic changes. [Results] We have constructed mini-Tn7 delivery vectors for the integration and stable expression of the pleD* gene encoding a highly active DGC, which can be used to artificially increase the intracellular levels of c-di-GMP in Gram negative bacteria. The functionality of these new vectors has been validated in several plant-interacting α- and γ-proteobacteria. Similarly to vector plasmid-borne pleD*, the genome-borne mini-Tn7pleD* constructs provide significant increases in intracellular c-di-GMP, provoking expected phenotypic changes such as enhanced polysaccharide production, biofilm formation and reduced motility. However, the mini-Tn7pleD* constructs resulted far more stable in the absence of antibiotics than the plasmid-based pleD* constructs. Furthermore, we have also implemented an inducible system to modulate pleD* expression and intracellular c-di-GMP rises “on demand”. [Conclusions] mini-Tn7pleD* constructs are very stable and are maintained during bacterial free-living growth as well as during interaction with eukaryotic hosts, in the absence of selective pressure. This high stability ensures experimental homogeneity in time and space with regard to enhancing c-di-GMP intracellular levels in bacteria of interest. |
Versión del editor: | http://dx.doi.org/10.1186/s12866-015-0521-6 | URI: | http://hdl.handle.net/10261/125916 | DOI: | 10.1186/s12866-015-0521-6 | ISSN: | 1471-2180 |
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