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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Methanobactin, a copper-acquisition compound from methane-oxidizing bacteria.

Hyung J Kim1, David W Graham, Alan A DiSpirito

  • 1Department of Civil, Environmental, and Architectural Engineering, University of Kansas, Lawrence, KS 66045, USA.

Science (New York, N.Y.)
|September 14, 2004
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Researchers discovered methanobactin, a copper-binding molecule from methane-oxidizing bacteria. This fluorescent chromopeptide

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Area of Science:

  • Biochemistry
  • Microbiology
  • Structural Biology

Background:

  • Siderophores facilitate iron transport in cells.
  • Methane-oxidizing bacteria utilize specific compounds for nutrient uptake.

Purpose of the Study:

  • To identify and characterize analogous molecules for copper transport in methane-oxidizing bacteria.
  • To elucidate the structure and function of methanobactin from Methylosinus trichosporium OB3b.

Main Methods:

  • Crystal structure determination of methanobactin to 1.15 angstrom resolution.
  • Analysis of the chemical composition and coordination environment of the copper-bound molecule.

Main Results:

  • A novel fluorescent chromopeptide, methanobactin, was identified for copper transport.
  • The structure revealed unusual moieties, including thionyl-imidazole chromophores coordinating copper.
  • The copper coordination involves a dual nitrogen- and sulfur-donating system.

Conclusions:

  • Methanobactin represents a new class of biomolecules analogous to siderophores for copper transport.
  • Structural insights have implications for organo-copper chemistry and methane oxidation.
  • This discovery impacts understanding of global carbon cycling processes.