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    Characterization of the SPI-1 and Rsp type three secretion systems in Pseudomonas fluorescens F113

    Access Status
    Fulltext not available
    Authors
    Barret, Matthieu
    Egan, Frank
    Moynihan, Jennifer
    Morrissey, John
    Lesouhaitier, Olivier
    O'Gara, Fergal
    Date
    2013
    Type
    Journal Article
    
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    Citation
    Barret, Matthieu and Egan, Frank and Moynihan, Jennifer and Morrissey, John and Lesouhaitier, Olivier and O'Gara, Fergal. 2013. Characterization of the SPI-1 and Rsp type three secretion systems in Pseudomonas fluorescens F113. Environmental Microbiology Reports. 5 (3): pp. 377-386.
    Source Title
    Environmental Microbiology
    DOI
    10.1111/1758-2229.12039
    ISSN
    1462-2912
    URI
    http://hdl.handle.net/20.500.11937/31727
    Collection
    • Curtin Research Publications
    Abstract

    Pseudomonas fluorescens F113 is a plant growth promoting rhizobacterium (PGPR) isolated from the sugar beet rhizosphere. The recent annotation of the F113 genome sequence has revealed that this strain encodes a wide array of secretion systems, including two complete type three secretion systems (T3SSs) belonging to the Hrp1 and SPI-1 families. While Hrp1 T3SSs are frequently encoded in other P. fluorescens strains, the presence of a SPI-1 T3SS in a plant beneficial bacterial strain was unexpected. In this work, the genetic organization and expression of these two T3SS loci have been analysed by a combination of transcriptional reporter fusions and transcriptome analyses. Overexpression of two transcriptional activators has shown a number of genes encoding putative T3 effectors. In addition, the influence of these two T3SSs during the interaction of P. fluorescens F113 with some bacterial predators was also assessed. Our data revealed that the transcriptional activator hilA is induced by amoeba and that the SPI-1 T3SS could potentially be involved in resistance to amoeboid grazing.

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