Oxidative stress under low oxygen conditions triggers hyperflagellation and motility in the Antarctic bacterium Pseudomonas extremaustralis

Esmeralda C. Solar Venero, Martiniano M. Ricardi, María Gómez Lozano, Søren Molin, Paula M. Tribelli, Nancy I. López*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Reactive oxygen species and nitrogen species (ROS and RNS), produced in a wide range of physiological process even under low oxygen availability, are among the main stressors found in the environment. Strategies developed to combat them constitute key features in bacterial adaptability and survival. Pseudomonas extremaustralis is a metabolic versatile and stress resistant Antarctic bacterium, able to grow under different oxygen conditions. The present work explores the effect of oxidative stress under low oxygen conditions in P. extremaustralis, by combining RNA deep sequencing analysis and physiological studies. Cells grown under microaerobiosis exhibited more oxidative damage in macromolecules and lower survival rates than under aerobiosis. RNA-seq analysis showed an up-regulation of genes related with oxidative stress response, flagella, chemotaxis and biofilm formation while chaperones and cytochromes were down-regulated. Microaerobic cultures exposed to H2O2 also displayed a hyper-flagellated phenotype coupled with a high motility behavior. Moreover, cells that were subjected to oxidative stress presented increased biofilm formation. Altogether, our results suggest that a higher motile behavior and augmented capacity to form biofilm structures could work in addition to well-known antioxidant enzymes and non-enzymatic ROS scavenging mechanisms to cope with oxidative stress at low oxygen tensions.
Original languageEnglish
JournalExtremophiles
Volume23
Issue number5
Pages (from-to)587-597
Number of pages11
ISSN1431-0651
DOIs
Publication statusPublished - 2019

Keywords

  • Microbiology
  • Molecular Medicine
  • Antioxidative enzymes
  • Biofilms
  • Chemotaxis
  • Low oxygen availability
  • Reactive oxygen species
  • RNA-seq

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