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Published on: December 16, 2013
Insight into Metal Removal from Peptides that Sequester Copper for Methane Oxidation
Arnaud Baslé1, Abdelnasser El Ghazouani1, Jaeick Lee1
1Institute for Cell and Molecular Biosciences, Medical School, Newcastle University, Newcastle upon Tyne, NE2 4HH, UK.
Methanobactins bind copper for methane oxidation. A new crystal structure reveals how these modified peptides release copper, offering insights into methanotroph biology.
Area of Science:
- Biochemistry
- Structural Biology
- Microbiology
Background:
- Methanobactins (Mbns) are crucial modified peptides for copper sequestration in methanotrophs, essential for methane oxidation.
- Limited structural data exists for Mbns, hindering understanding of copper utilization and release mechanisms in these microorganisms.
Purpose of the Study:
- To elucidate the structural diversity of methanobactins.
- To gain the first insight into the copper-release mechanism of methanobactins.
Main Methods:
- X-ray crystallography of Methylosinus sporium NR3K CuI-Mbn.
- In vitro solution studies.
Main Results:
- The crystal structure reveals copper (CuI) chelation by nitrogen ligands (oxazolone, pyrazinediol) and sulfur atoms (thioamides).
- A conformational change in the N-terminal region leads to a CuI2-Mbn2 dimer, distinct from previously observed monomers.
- This dimeric structure facilitates copper release from methanobactins.
Conclusions:
- The crystal structure of CuI-Mbn provides significant structural information on Mbn diversity.
- The study reveals a novel mechanism for copper release involving Mbn dimerization.
- Understanding this mechanism is key to comprehending copper metabolism in methanotrophic bacteria.
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