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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
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Filling the mitochondrial copper pool.

Dennis R Winge1

  • 1From the Departments of Internal Medicine and Biochemistry, University of Utah Health Sciences Center, Salt Lake City, Utah 84132 Dennis.winge@hsc.utah.edu.

The Journal of Biological Chemistry
|February 21, 2018
PubMed
Summary
This summary is machine-generated.

Mitochondria import essential metalloproteins, but metal transport remains unclear. A new study reveals the SLC25A3 transporter imports copper (Cu(I)), clarifying mitochondrial copper sources and cellular copper homeostasis.

Keywords:
coppercytochrome c oxidase (Complex IV)metalmetal homeostasissuperoxide dismutase (SOD)

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Area of Science:

  • Mitochondrial biology
  • Cellular metal transport
  • Biochemistry

Background:

  • Mitochondria host critical metalloproteins requiring metallation post-import.
  • Protein import into mitochondria is understood, but metal ion import mechanisms are not.
  • Cellular copper homeostasis is vital for numerous biological processes.

Purpose of the Study:

  • To investigate the mechanisms of metal ion import into mitochondria.
  • To identify the transporter responsible for mitochondrial copper uptake.
  • To elucidate the role of the SLC25A3 transporter in copper homeostasis.

Main Methods:

  • Utilized biochemical assays to study transporter function.
  • Investigated the role of the SLC25A3 transporter in mammalian cells.
  • Analyzed copper transport across the inner mitochondrial membrane.

Main Results:

  • The mammalian SLC25A3 transporter functions as a copper (Cu(I)) importer.
  • SLC25A3 is responsible for copper uptake into mitochondria.
  • This finding clarifies a major source of mitochondrial copper.

Conclusions:

  • The SLC25A3 transporter plays a dual role, transporting both phosphate and copper (Cu(I)).
  • This discovery provides crucial insights into mitochondrial copper trafficking.
  • The study opens new avenues for understanding cellular copper homeostasis.