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Related Experiment Videos

Energy-dependent nuclear binding dictates metallothionein localization.

E S Woo1, D Dellapiazza, A S Wang

  • 1Department of Pharmacology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

Journal of Cellular Physiology
|November 24, 1999
PubMed
Summary

Metallothioneins (MTs) are proteins protecting cells from toxins. In SCC25 cells, MTII enters the nucleus via diffusion but is actively retained by nuclear factors, explaining its localization.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Toxicology

Background:

  • Metallothioneins (MTs) are stress-activated proteins involved in cellular protection against heavy metals and oxidative stress.
  • Observed nuclear and cytoplasmic MT phenotypes, despite MTs being small enough to freely diffuse through the nuclear envelope.

Purpose of the Study:

  • To investigate the mechanisms controlling the subcellular localization of Metallothionein II (MTII).
  • To elucidate the factors responsible for nuclear sequestration of MTII in human SCC25 carcinoma cells.

Main Methods:

  • Covalently linking MTII to a fluorescent label to track its subcellular distribution.
  • Examining MTII localization under pharmacologic (ATP depletion, wheat germ agglutinin) and physical (chilling) perturbations.
  • Utilizing digitonin-permeabilized SCC25 cells and in situ biochemical extractions.

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Main Results:

  • Fluorescent MTII localized to the nucleus in SCC25 cells.
  • Nuclear sequestration was inhibited by unlabeled MTII and wheat germ agglutinin, suggesting saturable binding and glycoprotein involvement.
  • ATP depletion inhibited nuclear localization, indicating an energy-dependent process for translocation or retention.
  • Chilling and absence of cytosolic extracts did not inhibit nuclear sequestration, supporting diffusion-based entry.
  • In situ extractions revealed at least two distinct nuclear binding activities for MTII.

Conclusions:

  • MTII diffuses into the nucleus of SCC25 cells.
  • Selective and active retention by nuclear binding factors determines MTII's nuclear localization phenotype.
  • This active retention mechanism explains the observed nuclear MT phenotype despite passive diffusion capabilities.