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Related Experiment Videos

Copper chaperones: function, structure and copper-binding properties.

M D Harrison1, C E Jones, C T Dameron

  • 1National Research Centre for Environmental Toxicology, University of Queensland, Australia.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|September 28, 1999
PubMed
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Copper chaperones are essential proteins that safely transport copper within cells to specific proteins, ensuring normal cellular metabolism. Their widespread conservation suggests a critical, universal role in cellular copper distribution.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Copper is vital for cellular metabolism, requiring precise intracellular trafficking to copper-dependent proteins.
  • Copper chaperones are crucial for both transporting copper and preventing its toxic accumulation in the cytoplasm.
  • Conservation across diverse species indicates a fundamental role for copper chaperones in most living systems.

Purpose of the Study:

  • To explore the role and characteristics of copper chaperones in intracellular copper transport.
  • To understand the specificity mechanisms by which copper chaperones deliver copper to target proteins.
  • To highlight the conserved structural and functional features of copper chaperones.

Main Methods:

  • Review and synthesis of existing data on copper chaperones.

Related Experiment Videos

  • Analysis of conserved structural motifs (e.g., MXCXXC) and protein folds (open-faced beta-sandwich).
  • Examination of specificity determinants and copper binding characteristics.

    • Main Results:

    • A specific copper chaperone serves each copper-dependent protein, though functional equivalence exists across different cell types for the same target.
    • Most identified copper chaperones share a common global fold and a conserved metal-binding motif.
    • Specificity is conferred by residues surrounding the copper-binding site, with copper binding as Cu(I) coordinated by sulfur ligands.
    • The copper chaperone for cytochrome-c-oxidase (Cox17) represents a notable exception to the general design.

    Conclusions:

    • Copper chaperones are essential, specific, and conserved proteins critical for cellular copper homeostasis and metabolism.
    • Understanding copper chaperone structure-function relationships provides insight into metalloprotein targeting.
    • The identified structural motifs and specificity mechanisms are key to the function of these vital proteins.