English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/107510
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 21 veces en Web of Knowledge®  |  Pub MebCentral Ver citas en PubMed Central  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)

ExpR Is Not Required for Swarming but Promotes Sliding in Sinorhizobium meliloti

Autor Nogales, Joaquina; Bernabéu-Roda, Lydia; Cuellar, Virginia; Soto, María José
Fecha de publicación abr-2012
EditorAmerican Society for Microbiology
Citación Journal of Bacteriology 194(8): 2027-2035 (2012)
ResumenSwarming is a mode of translocation dependent on flagellar activity that allows bacteria to move rapidly across surfaces. In several bacteria, swarming is a phenotype regulated by quorum sensing. It has been reported that the swarming ability of the soil bacterium Sinorhizobium meliloti Rm2011 requires a functional ExpR/Sin quorum-sensing system. However, our previous published results demonstrate that strains Rm1021 and Rm2011, both known to have a disrupted copy of expR, are able to swarm on semisolid minimal medium. In order to clarify these contradictory results, the role played by the LuxR-type regulator ExpR has been reexamined. Results obtained in this work revealed that S. meliloti can move over semisolid surfaces using at least two different types of motility. One type is flagellum-independent surface spreading or sliding, which is positively influenced by a functional expR gene mainly through the production of exopolysaccharide II (EPS II). To a lesser extent, EPS II-deficient strains can also slide on surfaces by a mechanism that is at least dependent on the siderophore rhizobactin 1021. The second type of surface translocation shown by S. meliloti is swarming, which is greatly dependent on flagella and rhizobactin 1021 but does not require ExpR. We have extended our study to demonstrate that the production of normal amounts of succinoglycan (EPS I) does not play a relevant role in surface translocation but that its overproduction facilitates both swarming and sliding motilities.
Versión del editorhttp://dx.doi.org/10.1128/JB.06524-11
URI http://hdl.handle.net/10261/107510
Identificadoresissn: 0021-9193
Aparece en las colecciones: (EEZ) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
ExpR_swarming_Nogales.pdf8,95 MBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.