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Intranuclear binding of nucleoplasmin

P L Paine1, R Yassin, T M Paine

  • 1Department of Biological Sciences, St. John's University, Jamaica, New York 11439, USA.

Journal of Cellular Biochemistry
|May 1, 1995
PubMed
Summary
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Nuclear localization signals (NLSs) mediate protein transport into the nucleus. This study shows that nucleoplasmin (Np) binding within the nucleus of Xenopus oocytes drives NLS protein nuclear accumulation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Transport

Background:

  • Many proteins, including enzymes and transcription factors, are found at higher concentrations in the nucleus than the cytoplasm.
  • Nuclear localization sequences (NLSs) direct proteins through nuclear pore complexes, but the exact transport mechanism remains debated.

Purpose of the Study:

  • To investigate the mechanism of nuclear accumulation for proteins containing NLSs.
  • To determine if intranuclear binding plays a role in the in vivo accumulation of NLS-containing proteins.

Main Methods:

  • Experiments were conducted using living Xenopus oocytes.
  • The study focused on a prototypical NLS protein, nucleoplasmin (Np).

Main Results:

Related Experiment Videos

  • Nucleoplasmin (Np) was demonstrated to bind within the nucleus of living Xenopus oocytes.
  • This intranuclear binding was shown to be the cause of Np's nuclear accumulation.

Conclusions:

  • Intranuclear binding is a critical factor for the nuclear accumulation of NLS-containing proteins, such as nucleoplasmin.
  • This finding provides evidence against solely passive or simple facilitated transport mechanisms for these proteins.