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Structure and dynamics of Cu(I) binding in copper chaperones Atox1 and CopZ: a computer simulation study
Agustina Rodriguez-Granillo1, Pernilla Wittung-Stafshede
1Department of Biochemistry and Cell Biology, Rice University, 6100 Main Street, Houston, Texas 77251, USA.
Copper chaperones like Atox1 and CopZ deliver copper ions to proteins. Computational studies reveal distinct copper-binding geometries and increased flexibility in the unbound forms of these essential copper transporters.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Copper chaperones are vital for intracellular copper transport.
- They deliver Cu(I) to P-type ATPases using Cys-rich metal-binding motifs.
- Homologous chaperones Atox1 (human) and CopZ (bacterial) share structural similarities.
Purpose of the Study:
- To investigate the Cu(I)-binding geometry and structural dynamics of Atox1 and CopZ.
- To compare the behavior of these homologous copper chaperones using computational methods.
- To understand the impact of copper binding on protein flexibility and stability.
Main Methods:
- Combined quantum mechanical-molecular mechanics (QM-MM) for optimized geometries.
- Classical molecular dynamics (MD) simulations for structural dynamics.
- Analysis of protein flexibility, thermal stability, and copper-binding parameters.
Main Results:
- Cu(I) exhibits a linear Cys-Cu-Cys angle in Atox1, deviating to ~150 degrees in CopZ.
- Apo-forms (copper-free) of both chaperones display increased conformational flexibility compared to holo-forms (copper-bound).
- Copper binding influences protein dynamics, with notable differences in protein-solvent interactions and Cys-Cys distances between Atox1 and CopZ.
Conclusions:
- Distinct structural and dynamic differences exist between homologous copper chaperones Atox1 and CopZ.
- Copper binding significantly impacts the overall protein structure and flexibility.
- These findings offer insights into the mechanisms of copper transport and P-type ATPase function.
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