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Copper-dependent protein-protein interactions studied by yeast two-hybrid analysis.
Elisabeth M W M van Dongen1, Leo W J Klomp, Maarten Merkx
1Laboratory of Macromolecular and Organic Chemistry, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Biochemical and Biophysical Research Communications
|September 24, 2004
Summary
Copper chaperone proteins (Atx1, ATOX1) deliver copper to ATPases (Ccc2, ATP7A/B) via MXCXXC motifs. Yeast two-hybrid analysis revealed specific interactions and a bell-shaped copper dependency, suggesting its use for studying cellular copper status.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Copper homeostasis is crucial, involving copper delivery to P-type ATPases by chaperone proteins.
- Key proteins like Atx1, ATOX1, Ccc2, ATP7A, and ATP7B utilize MXCXXC motifs for copper transport.
- Protein-protein interactions mediated by these motifs are essential for copper delivery.
Purpose of the Study:
- To systematically screen all possible interactions between MXCXXC-containing domains of copper-related proteins.
- To investigate the role of copper concentration in these protein-protein interactions.
- To assess the utility of yeast two-hybrid analysis for studying intracellular copper status.
Main Methods:
- Yeast two-hybrid analysis was employed to screen interactions between MXCXXC domains.
- Systematic screening of all potential interaction combinations was performed.
- Copper concentration dependency of interactions was analyzed.
Main Results:
- ATOX1 and Atx1 preferentially interact with domains 2 and 4 of ATP7B.
- Atx1 interacts with both Ccc2 domains.
- All interactions exhibited a bell-shaped dependency on copper concentration, peaking below normal levels.
Conclusions:
- Specific interactions between copper chaperones and ATPases were identified.
- The study highlights a novel application of yeast two-hybrid analysis for assessing cellular copper status.
- The findings provide insights into the mechanism of copper transport and homeostasis.