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Copper-mediated dimerization of CopZ, a predicted copper chaperone from Bacillus subtilis
Margaret A Kihlken1, Andrew P Leech, Nick E Le Brun
1Centre for Metalloprotein Spectroscopy and Biology, School of Chemical Sciences and Pharmacy, University of East Anglia, Norwich NR4 7TJ, UK.
The Biochemical Journal
|September 20, 2002
Summary
Bacillus subtilis CopZ protein binds copper(I) ions, forming dimers and distinct complexes depending on copper loading. This complex copper binding may facilitate protein-to-protein copper transfer.
Area of Science:
- Biochemistry
- Molecular Biology
- Metalloprotein Chemistry
Background:
- Metallo-chaperones are crucial for metal ion transfer within cells.
- Understanding their metal-binding properties is key to their function.
Purpose of the Study:
- Investigate the copper-binding properties and solution states of Bacillus subtilis CopZ.
- Characterize the role of cysteine residues in copper binding.
Main Methods:
- Spectroscopic methods
- Bioanalytical techniques
- Biochemical assays
Main Results:
- Copper-free CopZ is monomeric; copper(I) induces homodimerization.
- Three distinct copper(I)-CopZ forms detected (0.5, 1.0, 1.5 copper ions per protein).
- Dithiothreitol promotes monomeric copper(I)-CopZ formation, highlighting cysteine's role.
Conclusions:
- The complex copper(I) binding of CopZ may underlie its role in copper(I) transfer between proteins.
- Cysteine residues are essential for tight copper binding in CopZ.