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- The PseEF Efflux System Is a Virulence Factor of Pseudomonas syringae pv. syringae
- Hyosun Cho , Hyojeung Kang
- J. Microbiol. 2012;50(1):79-90. Published online February 27, 2012
- DOI: https://doi.org/10.1007/s12275-012-1353-9
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Abstract
- An ATP-binding cassette (ABC) transporter, called the PseEF efflux system, was identified at the left border of the syr-syp genomic island of Pseudomonas syringae pv. syringae strain B301D. The PseEF efflux system was located within a 3.3-kb operon that encodes a periplasmic membrane fusion protein (PseE), and an ABC-type cytoplasmic membrane protein (PseF). The PseEF efflux system exhibited amino acid homology to a putative ABC efflux system (MacAB) of E. coli W3104 with identities of 47.2% (i.e., PseE to MacA) and 57.6% (i.e., PseF to MacB). A nonpolar mutation within the pseF gene was generated by nptII insertional mutagenesis. The resultant mutant strain showed significant reduction in secretion of syringomycin (74%) and syringopeptin (71%), as compared to parental strain B301D. Quantitative real-time RT-PCR was used to determine transcript levels of the syringomycin (syrB1) and syringopeptin (sypA) synthetase genes in strain B301D-HK7 (a pseF mutant). Expression of the sypA gene by mutant strain B301D-HK7 was approximately 6.9% as compared to that of parental strain B301D, while the syrB1 gene expression by mutant strain B301D-HK7 was nearly 14.6%. In addition, mutant strain B301D-HK7 was less virulent by approximately 67% than parental strain B301D in immature cherry fruits. Mutant strain B301D-HK7 was not reduced in resistance to any antibiotics used in this study as compared to parental strain B301D. Expression (transcript levels) of the pseF gene was induced approximately six times by strain B301D grown on syringomycin minimum medium (SRM) supplemented with the plant signal molecules arbutin and D-fructose (SRMAF), as compared to that of strain B301D grown on SRM (in the absence of plant signal molecules). In addition, during infection of bean plants by P. syringae pv. syringae strain B728a, expression of the pseF gene increased at 3 days after inoculation (dai). More than 180-fold induction was observed in transcript levels of the pseF gene by parental strain B728a as compared to strain B728a-SL7 (a salA mutant). Thus, the PseEF efflux system, an ABC-type efflux system, has an important role in secretion of syringomycin and syringopeptin, and is required for full virulence in P. syringae pv. syringae.
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Citations
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