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Dual pathways for copper uptake by methanotrophic bacteria.

Ramakrishnan Balasubramanian1, Grace E Kenney, Amy C Rosenzweig

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Methanobactin (Mb) facilitates copper uptake in methanotrophs. This study confirms direct cellular uptake of copper-loaded Mb (Cu-Mb) via an active transport mechanism specific to these bacteria.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Environmental Science

Background:

  • Methanobactin (Mb) is a copper chelator produced by methanotrophs.
  • Its role in copper acquisition, especially from insoluble sources, is hypothesized.
  • Direct experimental evidence for Cu-Mb uptake was previously lacking.

Purpose of the Study:

  • To demonstrate the direct uptake of intact copper-loaded methanobactin (Cu-Mb) by methanotrophs.
  • To elucidate the mechanism and specificity of Cu-Mb uptake.
  • To confirm the role of Cu-Mb in copper acquisition.

Main Methods:

  • Isotopic and fluorescent labeling experiments were used to track Cu-Mb.
  • Confocal microscopy visualized Cu-Mb localization within the cell.
  • Inhibition studies with specific agents (spermine, uncouplers) differentiated uptake mechanisms.

Main Results:

  • Direct uptake of intact Cu-Mb by Methylosinus trichosporium OB3b was confirmed.
  • Cu-Mb is localized in the cytoplasm.
  • Cu-Mb uptake occurs via an active transport process, distinct from unchelated copper uptake.
  • Cu-Mb uptake is specific to methanotrophic bacteria.

Conclusions:

  • Copper-loaded methanobactin (Cu-Mb) is directly internalized by methanotrophs through an active transport system.
  • This uptake mechanism is specific to methanotrophic bacteria, highlighting Cu-Mb's crucial role in their copper acquisition.
  • Findings support Cu-Mb's function in mediating copper uptake for essential enzymes.