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Nuclear localization signal of ING4 plays a key role in its binding to p53

Xin Zhang1, Ke-Sheng Wang, Zhi-Qin Wang

  • 1State Key Laboratory of Bioreactor Engineering, New World Institute of Biotechnology, East China University of Science and Technology, Shanghai 200237, China.

Biochemical and Biophysical Research Communications
|May 11, 2005
PubMed

Insights

The ING4 protein

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • ING4 interacts with tumor suppressor p53, inhibiting cell growth.
  • ING4's role in p53 binding and cell cycle regulation requires further elucidation.
  • The specific region of ING4 responsible for p53 interaction is not well-defined.

Purpose of the Study:

  • To identify the region of ING4 responsible for binding to p53.
  • To investigate the functional significance of the ING4-p53 interaction.
  • To explore the role of ING4's nuclear localization signal (NLS) in its interaction with p53.

Main Methods:

  • GST-pulldown assays to determine protein-protein interactions.
  • In vitro and in vivo experiments to assess the impact of mutations.
  • Analysis of ING4 nuclear localization and p53-inducible gene expression.

Main Results:

  • The middle region of ING4, containing a potential bipartite nuclear localization signal (NLS), is involved in p53 binding.
  • Mutations or deletion of the NLS domain abrogated ING4-p53 interaction both in vitro and in vivo.
  • Altered ING4 nuclear localization and disrupted p53-p21 interaction were observed upon NLS domain mutation.

Conclusions:

  • The NLS domain of ING4 is crucial for its binding to p53.
  • ING4's NLS is essential for its nuclear localization and interaction with p53.
  • The ING4 NLS domain plays a key role in regulating p53-dependent gene expression, specifically p21.

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