The interplay between Mn and Fe in Deinococcus radiodurans triggers cellular protection during paraquat-induced oxidative stress

Sci Rep. 2019 Nov 20;9(1):17217. doi: 10.1038/s41598-019-53140-2.

Abstract

The bacterium Deinococcus radiodurans is highly resistant to several stress conditions, such as radiation. According to several reports, manganese plays a crucial role in stress protection, and a high Mn/Fe ratio is essential in this process. However, mobilization of manganese and iron, and the role of DNA-binding-proteins-under-starved-conditions during oxidative-stress remained open questions. We used synchrotron-based X-ray fluorescence imaging at nano-resolution to follow element-relocalization upon stress, and its dependency on the presence of Dps proteins, using dps knockout mutants. We show that manganese, calcium, and phosphorus are mobilized from rich-element regions that resemble electron-dense granules towards the cytosol and the cellular membrane, in a Dps-dependent way. Moreover, iron delocalizes from the septum region to the cytoplasm affecting cell division, specifically in the septum formation. These mechanisms are orchestrated by Dps1 and Dps2, which play a crucial role in metal homeostasis, and are associated with the D. radiodurans tolerance against reactive oxygen species.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins / genetics
  • Bacterial Proteins / metabolism*
  • Cytoprotection / drug effects*
  • Deinococcus / drug effects
  • Deinococcus / growth & development*
  • Herbicides / pharmacology
  • Iron / metabolism*
  • Manganese / metabolism*
  • Oxidative Stress / drug effects*
  • Paraquat / pharmacology*
  • Reactive Oxygen Species / metabolism

Substances

  • Bacterial Proteins
  • Herbicides
  • Reactive Oxygen Species
  • Manganese
  • Iron
  • Paraquat