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Inactivation of the Pseudomonas putida KT2440 dsbA gene promotes extracellular matrix production and biofilm formation

Authors
Lee, YunhoOh, SejongPark, Woojun
Issue Date
8월-2009
Publisher
OXFORD UNIV PRESS
Keywords
pellicle; Escherichia coli O157; oxidative stress; soil bacterium; pleiotropic phenotypes; motility assay
Citation
FEMS MICROBIOLOGY LETTERS, v.297, no.1, pp.38 - 48
Indexed
SCIE
SCOPUS
Journal Title
FEMS MICROBIOLOGY LETTERS
Volume
297
Number
1
Start Page
38
End Page
48
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/119523
DOI
10.1111/j.1574-6968.2009.01650.x
ISSN
0378-1097
Abstract
To identify genes essential to biofilm formation in Pseudomonas putida KT2440, 12 mutants defective in oxidative stress-related or metabolic pathway-related genes were evaluated. Of them, only the dsbA mutant lacking the disulfide bond isomerase exhibited significantly increased attachment to the polystyrene surface. Visual evaluation by extracellular matrix staining and scanning electron microscopy indicated that the KT2440-Delta dsbA strain displays enhanced extracellular matrix production, rugose colony morphology on agar plates and floating pellicles in static culture. Accordingly, we propose that deletion of the dsbA gene may stimulate production of the extracellular matrix, resulting in those phenotypes. In addition, the lack of detectable fluorescence in the KT2440-Delta dsbA under UV light as well as in both the wild type and the KT2440-Delta dsbA when grown on Luria-Bertani plates containing ferrous iron suggests that the fluorescent molecule may be a fluorescent siderophore with its synthesis/secretion controlled by DsbA in KT2440. These phenotypic defects observed in the dsbA mutant were complemented by the full-length KT2440 and Escherichia coli dsbA genes. In contrast to the role of DsbA in other bacteria, our results provide the first evidence that disruption of P. putida KT2440 dsbA gene overproduces the extracellular matrix and thus promotes biofilm formation.
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생명과학대학 (환경생태공학부)
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