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Elevated intracellular copper induces CTR1 monomerization and prevents copper uptake.

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Elevated intracellular copper causes Copper Transporter 1 (CTR1) to monomerize, halting copper uptake. This oligomerization change is key to rapid copper homeostasis regulation.

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Molecular Medicine

Background:

  • Copper is vital for cellular functions but toxic if dysregulated.
  • Copper Transporter 1 (CTR1) regulates cellular copper uptake and homeostasis.
  • The mechanism for rapid CTR1 regulation of copper uptake remained unclear.

Purpose of the Study:

  • To investigate the mechanism of rapid copper uptake regulation by CTR1.
  • To understand how CTR1 responds to changes in intracellular copper levels.
  • To elucidate the role of CTR1 oligomerization in copper homeostasis.

Main Methods:

  • Single-molecule localization microscopy (SMLM)
  • Single-molecule neighbor density assays
  • Analysis of wild-type and endocytosis-deficient CTR1 mutants (M150L)

Main Results:

  • Elevated intracellular copper induced monomerization of wild-type CTR1 trimers.
  • CTR1 monomerization preceded endocytosis, a process blocked in the CTR1 (M150L) mutant.
  • CTR1 monomerization correlated with an immediate cessation of copper uptake.

Conclusions:

  • CTR1 oligomerization state changes are critical for rapid copper uptake regulation.
  • Monomerization of CTR1 serves as a mechanism to halt copper influx.
  • CTR1 oligomerization dynamics are a key factor in maintaining cellular copper homeostasis.