Variations in Mn(II) speciation among organisms: what makes D. radiodurans different

Metallomics. 2015 Jan;7(1):136-44. doi: 10.1039/c4mt00265b. Epub 2014 Nov 18.

Abstract

The manganese(II) speciation in intact cells of D. radiodurans, E. coli, S. cerevisiae and Arabidopsis thaliana seeds was measured using high-field electron paramagnetic resonance techniques. The majority of the Mn(II) ions in these organisms were six-coordinate, bound predominately by water, phosphates and nitrogen-based molecules. The relative distribution of the different phosphates in bacteria and S. cerevisiae was the same and dominated by monophosphate monoesters. Mn(II) was also found bound to the phosphate backbone of nucleic acids in these organisms. Phosphate ligation in Arabidopsis seeds was dominated by phytate. The extent of nitrogen ligation in the four organisms was also determined. On average, the Mn(II) in D. radiodurans had the most nitrogen ligands followed by E. coli. This was attributed to higher concentrations of Mn(II) bound to proteins in these species. Although constitutively expressed in all four organisms, MnSOD was only detected in D. radiodurans. As previously reported, D. radiodurans also accumulates a second abundant Mn containing protein species. The high concentration of proteinaceous Mn(II) is a unique feature of D. radiodurans.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Deinococcus / chemistry*
  • Deinococcus / metabolism*
  • Escherichia coli / chemistry
  • Escherichia coli / metabolism
  • Manganese / chemistry*
  • Manganese / metabolism*
  • Nuclear Magnetic Resonance, Biomolecular
  • Nucleic Acids / chemistry
  • Nucleic Acids / metabolism
  • Phosphates / chemistry
  • Phosphates / metabolism
  • Saccharomyces cerevisiae / chemistry
  • Saccharomyces cerevisiae / metabolism
  • Water / chemistry

Substances

  • Nucleic Acids
  • Phosphates
  • Water
  • Manganese