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Competitive ligand exchange between Cu-humic acid complexes and methanobactin.

M-L Pesch1, M Hoffmann, I Christl

  • 1Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, CHN, Universitätstrasse 16, Zurich, Switzerland.

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Summary

Methanobactin, a compound produced by microbes, efficiently retrieves copper from natural organic matter. This process is vital for methane oxidation, especially in copper-limited environments.

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Area of Science:

  • Biogeochemistry
  • Microbiology
  • Environmental Chemistry

Background:

  • Copper (Cu) is essential for methanotrophic microorganisms, impacting methane oxidation rates.
  • Natural organic matter (NOM) in environments like soils and sediments can limit Cu bioavailability through complexation.
  • Methanotrophs produce methanobactin, a high-affinity copper-binding ligand, to enhance Cu uptake.

Purpose of the Study:

  • To investigate methanobactin's ability to acquire copper from natural organic matter.
  • To understand the kinetics and mechanisms of copper mobilization from humic acid by methanobactin.

Main Methods:

  • UV-vis spectroscopy to monitor ligand exchange kinetics between Cu-humic acid (HA) and methanobactin.
  • Size-exclusion chromatography coupled with ICP-MS to determine copper speciation in methanobactin complexes.
  • Equilibrium experiments to assess competitive binding between methanobactin and HA for copper.

Main Results:

  • Copper was rapidly mobilized from humic acid via a ligand exchange reaction, following second-order kinetics.
  • Reaction rates were temperature-dependent, decreasing as temperature decreased.
  • Methanobactin demonstrated effective competition with humic acid for copper, forming stable 1:1 copper-methanobactin complexes.
  • Methanobactin showed no significant sorption to humic acid.

Conclusions:

  • Methanobactin efficiently acquires copper from natural organic matter, even in complex environmental matrices.
  • This mechanism is crucial for ensuring sufficient copper supply for methanotrophic activity in copper-limited ecosystems.
  • The findings highlight methanobactin's role in copper biogeochemical cycling and microbial physiology.