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Volume 160, Issue 12

Fis overexpression enhances biofilm formation by regulating the ratio of LapA and LapF Free

Abstract

Bacteria form biofilm as a response to a number of environmental signals that are mediated by global transcription regulators and alarmones. Here we report the involvement of the global transcription regulator Fis in biofilm formation through regulation of and genes. The major component of biofilm is proteinaceous and two large adhesive proteins, LapA and LapF, are known to play a key role in its formation. We have previously shown that Fis overexpression enhances biofilm formation. In this study, we used mini-Tn transposon mutagenesis to select potential Fis-regulated genes involved in biofilm formation. A total of 90 % of the studied transposon mutants carried insertions in the genes. Since our experiments showed that Fis-enhanced biofilm is mostly proteinaceous, the amounts of LapA and LapF from cells lysates were quantified using SDS-PAGE. Fis overexpression increases the quantity of LapA 1.6 times and decreases the amount of LapF at least 4 times compared to the wild-type cells. The increased LapA expression caused by Fis overexpression was confirmed by FACS analysis measuring the amount of LapA-GFP fusion protein. Our results suggest that the profusion of LapA in the Fis-overexpressed cells causes enhanced biofilm formation in mature stages of biofilm and LapF has a minor role in biofilm formation.

  • Received:
  • Accepted:
  • Published Online:
Funding
This study was supported by the:
  • Estonian Ministry of Education and Research (Award IUT20-19 and SF0180031s08)
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2014-12-01
2024-04-19
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Fis overexpression enhances Pseudomonas putida biofilm formation by regulating the ratio of LapA and LapF
Microbiology 160, 2681 (2014); https://doi.org/10.1099/mic.0.082503-0
/content/journal/micro/10.1099/mic.0.082503-0
/content/journal/micro/10.1099/mic.0.082503-0
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