Cargando…
Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style
BACKGROUND: N-acylhomoserine lactone (AHL)-based quorum sensing (QS) systems have been described in many plant-associated Gram-negative bacteria to control certain beneficial phenotypic traits, such as production of biocontrol factors and plant growth promotion. However, the role of AHL-mediated sig...
Autores principales: | , , , , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2011
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3044098/ https://www.ncbi.nlm.nih.gov/pubmed/21284858 http://dx.doi.org/10.1186/1471-2180-11-26 |
_version_ | 1782198678641967104 |
---|---|
author | Liu, Xiaoguang Jia, Jinli Popat, Roman Ortori, Catherine A Li, Jun Diggle, Stephen P Gao, Kexiang Cámara, Miguel |
author_facet | Liu, Xiaoguang Jia, Jinli Popat, Roman Ortori, Catherine A Li, Jun Diggle, Stephen P Gao, Kexiang Cámara, Miguel |
author_sort | Liu, Xiaoguang |
collection | PubMed |
description | BACKGROUND: N-acylhomoserine lactone (AHL)-based quorum sensing (QS) systems have been described in many plant-associated Gram-negative bacteria to control certain beneficial phenotypic traits, such as production of biocontrol factors and plant growth promotion. However, the role of AHL-mediated signalling in the endophytic strains of plant-associated Serratia is still poorly understood. An endophytic Serratia sp. G3 with biocontrol potential and high levels of AHL signal production was isolated from the stems of wheat and the role of QS in this isolate was determined. RESULTS: Strain G3 classified as Serratia plymuthica based on 16S rRNA was subjected to phylogenetic analysis. Using primers to conserved sequences of luxIR homologues from the Serratia genus, splIR and spsIR from the chromosome of strain G3 were cloned and sequenced. AHL profiles from strain G3 and Escherichia coli DH5α expressing splI or spsI from recombinant plasmids were identified by liquid chromatography-tandem mass spectrometry. This revealed that the most abundant AHL signals produced by SplI in E. coli were N-3-oxo-hexanoylhomoserine lactone (3-oxo-C6-HSL), N-3-oxo-heptanoylhomoserine lactone (3-oxo-C7-HSL), N-3-hydroxy-hexanoylhomoserine lactone (3-hydroxy-C6-HSL), N-hexanoylhomoserine lactone (C6-HSL), and N-heptanoyl homoserine lactone (C7-HSL); whereas SpsI was primarily responsible for the synthesis of N-butyrylhomoserine lactone (C4-HSL) and N-pentanoylhomoserine lactone (C5-HSL). Furthermore, a quorum quenching analysis by heterologous expression of the Bacillus A24 AiiA lactonase in strain G3 enabled the identification of the AHL-regulated biocontrol-related traits. Depletion of AHLs with this lactonase resulted in altered adhesion and biofilm formation using a microtiter plate assay and flow cells coupled with confocal laser scanning microscopy respectively. This was different from the closely related S. plymuthica strains HRO-C48 and RVH1, where biofilm formation for both strains is AHL-independent. In addition, QS in G3 positively regulated antifungal activity, production of exoenzymes, but negatively regulated production of indol-3-acetic acid (IAA), which is in agreement with previous reports in strain HRO-C48. However, in contrast to HRO-C48, swimming motility was not controlled by AHL-mediated QS. CONCLUSIONS: This is the first report of the characterisation of two AHL-based quorum sensing systems in the same isolate of the genus Serratia. Our results show that the QS network is involved in the global regulation of biocontrol-related traits in the endophytic strain G3. However, although free-living and endophytic S. plymuthica share some conservation on QS phenotypic regulation, the control of motility and biofilm formation seems to be strain-specific and possible linked to the life-style of this organism. |
format | Text |
id | pubmed-3044098 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2011 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-30440982011-02-24 Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style Liu, Xiaoguang Jia, Jinli Popat, Roman Ortori, Catherine A Li, Jun Diggle, Stephen P Gao, Kexiang Cámara, Miguel BMC Microbiol Research Article BACKGROUND: N-acylhomoserine lactone (AHL)-based quorum sensing (QS) systems have been described in many plant-associated Gram-negative bacteria to control certain beneficial phenotypic traits, such as production of biocontrol factors and plant growth promotion. However, the role of AHL-mediated signalling in the endophytic strains of plant-associated Serratia is still poorly understood. An endophytic Serratia sp. G3 with biocontrol potential and high levels of AHL signal production was isolated from the stems of wheat and the role of QS in this isolate was determined. RESULTS: Strain G3 classified as Serratia plymuthica based on 16S rRNA was subjected to phylogenetic analysis. Using primers to conserved sequences of luxIR homologues from the Serratia genus, splIR and spsIR from the chromosome of strain G3 were cloned and sequenced. AHL profiles from strain G3 and Escherichia coli DH5α expressing splI or spsI from recombinant plasmids were identified by liquid chromatography-tandem mass spectrometry. This revealed that the most abundant AHL signals produced by SplI in E. coli were N-3-oxo-hexanoylhomoserine lactone (3-oxo-C6-HSL), N-3-oxo-heptanoylhomoserine lactone (3-oxo-C7-HSL), N-3-hydroxy-hexanoylhomoserine lactone (3-hydroxy-C6-HSL), N-hexanoylhomoserine lactone (C6-HSL), and N-heptanoyl homoserine lactone (C7-HSL); whereas SpsI was primarily responsible for the synthesis of N-butyrylhomoserine lactone (C4-HSL) and N-pentanoylhomoserine lactone (C5-HSL). Furthermore, a quorum quenching analysis by heterologous expression of the Bacillus A24 AiiA lactonase in strain G3 enabled the identification of the AHL-regulated biocontrol-related traits. Depletion of AHLs with this lactonase resulted in altered adhesion and biofilm formation using a microtiter plate assay and flow cells coupled with confocal laser scanning microscopy respectively. This was different from the closely related S. plymuthica strains HRO-C48 and RVH1, where biofilm formation for both strains is AHL-independent. In addition, QS in G3 positively regulated antifungal activity, production of exoenzymes, but negatively regulated production of indol-3-acetic acid (IAA), which is in agreement with previous reports in strain HRO-C48. However, in contrast to HRO-C48, swimming motility was not controlled by AHL-mediated QS. CONCLUSIONS: This is the first report of the characterisation of two AHL-based quorum sensing systems in the same isolate of the genus Serratia. Our results show that the QS network is involved in the global regulation of biocontrol-related traits in the endophytic strain G3. However, although free-living and endophytic S. plymuthica share some conservation on QS phenotypic regulation, the control of motility and biofilm formation seems to be strain-specific and possible linked to the life-style of this organism. BioMed Central 2011-02-01 /pmc/articles/PMC3044098/ /pubmed/21284858 http://dx.doi.org/10.1186/1471-2180-11-26 Text en Copyright ©2011 Liu et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Liu, Xiaoguang Jia, Jinli Popat, Roman Ortori, Catherine A Li, Jun Diggle, Stephen P Gao, Kexiang Cámara, Miguel Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title | Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title_full | Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title_fullStr | Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title_full_unstemmed | Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title_short | Characterisation of two quorum sensing systems in the endophytic Serratia plymuthica strain G3: differential control of motility and biofilm formation according to life-style |
title_sort | characterisation of two quorum sensing systems in the endophytic serratia plymuthica strain g3: differential control of motility and biofilm formation according to life-style |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3044098/ https://www.ncbi.nlm.nih.gov/pubmed/21284858 http://dx.doi.org/10.1186/1471-2180-11-26 |
work_keys_str_mv | AT liuxiaoguang characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT jiajinli characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT popatroman characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT ortoricatherinea characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT lijun characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT digglestephenp characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT gaokexiang characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle AT camaramiguel characterisationoftwoquorumsensingsystemsintheendophyticserratiaplymuthicastraing3differentialcontrolofmotilityandbiofilmformationaccordingtolifestyle |