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Variations in methanobactin structure influences copper utilization by methane-oxidizing bacteria.

Abdelnasser El Ghazouani1, Arnaud Baslé, Joe Gray

  • 1Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|May 15, 2012
PubMed
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Methane-oxidizing bacteria use methanobactin (mbtin) to acquire copper for methane monooxygenases (MMOs). Variations in mbtin structure affect copper metabolism and bacterial species selection, impacting greenhouse gas regulation.

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Area of Science:

  • Environmental microbiology
  • Biochemistry
  • Biogeochemistry

Background:

  • Methane-oxidizing bacteria mitigate atmospheric methane, a potent greenhouse gas, using methane monooxygenases (MMOs).
  • The copper-dependent particulate MMO is highly efficient, but its function relies on copper availability.
  • Under copper limitation, some bacteria secrete methanobactin (mbtin) peptides to scavenge copper.

Purpose of the Study:

  • To investigate how structural variations in methanobactins influence copper metabolism in methane-oxidizing bacteria.
  • To understand the role of mbtin structure in copper acquisition and species selection.
  • To explore the implications of mbtin diversity for the ecological role of these bacteria.

Main Methods:

  • Isolation and characterization of methanobactins from different Methylocystis strains.
  • Analysis of mbtin amino acid composition and structural features.
  • Determination of copper-binding affinities and reduction potentials.

Main Results:

  • Methylocystis mbtins are shorter with different amino acid compositions compared to Methylosinus trichosporium OB3b mbtin.
  • A pyrazinedione ring in Methylocystis mbtins has minimal impact on Cu(I) site structure.
  • Methylocystis mbtins possess a sulfate group stabilizing Cu(I) forms with high affinity (~10^21 M^-1), and variable Cu(II) affinities.
  • Native mbtin accelerates copper uptake and enzyme switchover, indicating sequence-specific receptor interactions.

Conclusions:

  • Methanobactin structure significantly influences copper utilization by methane-oxidizing bacteria.
  • Structural differences in mbtins affect copper metabolism and may drive species selection.
  • Understanding mbtin variations is crucial for comprehending the ecology and global methane cycling functions of these bacteria.