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Human ING1 proteins differentially regulate histone acetylation.

Diego Vieyra1, Robbie Loewith, Michelle Scott

  • 1Department of Biochemistry, University of Calgary, Calgary, Alberta T2N 4N1, Canada.

The Journal of Biological Chemistry
|May 17, 2002
PubMed
Summary
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Human ING1 proteins regulate cell growth and apoptosis by interacting with histone acetyltransferases (HATs) and histone deacetylases (HDACs). These interactions link DNA repair, chromatin remodeling, and apoptosis via ING1-PCNA complexes.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Epigenetics

Background:

  • ING1 proteins are nuclear factors involved in growth inhibition and apoptosis.
  • ING1 homologs in yeast are associated with histone acetyltransferase (HAT) activity.

Purpose of the Study:

  • To investigate the interaction of human ING1 proteins with HATs and their role in histone acetylation.
  • To elucidate the function of different ING1 isoforms (p33ING1b and p47ING1a) in regulating histone acetylation and their association with DNA repair proteins.

Main Methods:

  • Immunoprecipitation assays to identify interacting proteins.
  • In vitro and in vivo assays to assess histone acetylation levels.
  • Analysis of protein-protein interactions, including ING1 with PCNA and p300.

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Main Results:

  • Human ING1 proteins interact with HATs (TRRAP, PCAF, CBP, p300) and possess HAT activity.
  • p33ING1b overexpression induces histone hyperacetylation, while p47ING1a inhibits acetylation and binds HDAC1.
  • p33ING1b modulates the association between PCNA and p300; ING1 binds PCNA in a DNA damage-dependent manner.

Conclusions:

  • ING1 proteins link DNA repair, apoptosis, and chromatin remodeling through HAT.ING1.PCNA complexes.
  • ING1 isoforms have distinct roles in regulating histone acetylation and cellular processes.