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Related Experiment Videos

An hGCN5/TRRAP histone acetyltransferase complex co-activates BRCA1 transactivation function through histone

Hajime Oishi1, Hirochika Kitagawa, Osamu Wada

  • 1Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-0032, Japan.

The Journal of Biological Chemistry
|November 2, 2005
PubMed
Summary

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New research identifies key co-regulatory factors, hGCN5 and TRRAP, essential for BRCA1 function in preventing breast and ovarian cancers. These factors interact with BRCA1 and are crucial for its role in gene regulation and DNA repair.

Area of Science:

  • Molecular Biology
  • Cancer Genetics
  • Biochemistry

Background:

  • Genetic mutations in BRCA1 are linked to increased risk of early-onset breast and ovarian cancers.
  • The specific co-regulatory factors supporting normal BRCA1 functions are not fully understood.
  • Identifying these factors is crucial for understanding BRCA1's role in cancer predisposition.

Purpose of the Study:

  • To identify co-regulatory proteins that interact with BRCA1.
  • To investigate the functional significance of these interactions in BRCA1-mediated gene regulation and DNA repair.
  • To characterize the composition and potential role of novel protein complexes involving BRCA1.

Main Methods:

  • Biochemical approaches were used to identify BRCA1-interacting proteins.

Related Experiment Videos

  • Co-immunoprecipitation and functional assays were employed to study protein interactions and transcriptional activity.
  • Purification of protein complexes was performed to analyze their composition.

    • Main Results:

    • hGCN5, TRRAP, and hMSH2/6 were identified as BRCA1-interacting proteins.
    • Mutations in BRCA1's C-terminal domain disrupt its interaction with TRRAP, impairing co-activation by hGCN5/TRRAP.
    • Overexpression of TRRAP or hGCN5 rescued transcriptional squelching between BRCA1 and estrogen receptor alpha.
    • A novel histone acetyltransferase complex containing hGCN5, TRRAP, hMSH2, and hMSH6 was identified, potentially linked to BRCA1's genome surveillance functions.

    Conclusions:

    • hGCN5 and TRRAP are critical co-regulators of BRCA1 function.
    • The identified novel hGCN5/TRRAP histone acetyltransferase complex subclass, including hMSH2/hMSH6, plays a role in BRCA1's diverse functions.
    • These findings provide new insights into the molecular mechanisms underlying BRCA1's tumor-suppressive activities and cancer predisposition.