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Related Experiment Videos

Transcriptional activation by NF-kappaB requires multiple coactivators.

K A Sheppard1, D W Rose, Z K Haque

  • 1Vascular Research Division, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.

Molecular and Cellular Biology
|August 24, 1999
PubMed
Summary

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Nuclear factor-kappaB (NF-kappaB) recruits coactivators similar to nuclear receptors. This process requires specific proteins and histone acetyltransferase activity for gene regulation.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Epigenetics

Background:

  • Nuclear factor-kappaB (NF-kappaB) is a key transcription factor regulating inflammation and cell survival.
  • Understanding NF-kappaB's regulatory mechanisms is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the coactivator complex recruited by NF-kappaB.
  • To compare NF-kappaB coactivator recruitment with that of nuclear receptors.
  • To elucidate the differential roles of NF-kappaB subunits in gene expression.

Main Methods:

  • Nuclear antibody microinjection to inactivate coactivator proteins.
  • Assessing NF-kappaB-dependent transactivation.
  • Analyzing the role of specific protein motifs (LXXLL) and histone acetyltransferase (HAT) activity.

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Main Results:

  • NF-kappaB recruits a coactivator complex resembling that of nuclear receptors.
  • Inactivation of CBP, p160 family members, or p/CAF inhibits NF-kappaB transactivation.
  • NF-kappaB-dependent gene expression requires LXXLL motifs and p/CAF's HAT activity, but not CBP's.
  • The p50 homodimer does not recruit coactivators, while the p50-p65 heterodimer does.

Conclusions:

  • NF-kappaB utilizes a coactivator complex with similarities to nuclear receptors.
  • Specific coactivator components and their enzymatic activities are essential for NF-kappaB function.
  • Differential recruitment of coactivators by NF-kappaB subunits (p50 vs. p50-p65) explains their distinct effects on gene expression.