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Regulation of AP-1/DNA complex formation in vitro.

M C Frame1, N M Wilkie, A J Darling

  • 1Cancer Research Campaign Beatson Laboratories, Beatson Institute for Cancer Research, Bearsden, Glasgow, UK.

Oncogene
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

This study reveals that AP-1 DNA-binding activity is controlled by a nuclear factor sensitive to oxidation and reduction. This mechanism specifically regulates the binding efficiency of pre-existing Fos and Jun proteins to AP-1 target sequences.

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Area of Science:

  • Molecular Biology
  • Transcription Factor Regulation

Background:

  • Activating Protein-1 (AP-1) is a crucial transcription factor involved in various cellular processes.
  • The precise regulation of AP-1 DNA-binding activity is essential for controlling gene expression.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling AP-1 DNA-binding activity in vitro.
  • To identify factors influencing the efficiency of AP-1 binding to its target DNA sequences.

Main Methods:

  • Utilized unfractionated Hela nuclear extracts and rabbit reticulocyte lysate.
  • Employed in vitro assays to measure AP-1 DNA-binding activity.
  • Investigated the role of specific proteins (Jun, Fos) and redox conditions (DTT, oxidized glutathione).

Main Results:

  • A low molecular weight fraction from reticulocyte lysate stimulated AP-1 DNA-binding activity.
  • This stimulation required a heat-labile nuclear component, likely a protein.
  • Dithiothreitol (DTT) substituted for the stimulatory fraction, while oxidized glutathione inhibited binding, suggesting redox control.
  • Levels of Jun and Fos proteins were consistent across stimulated and unstimulated extracts.
  • Binding of other transcription factors (SP-1, NF-1, CBP) remained unaffected.

Conclusions:

  • AP-1 DNA-binding efficiency is modulated by a nuclear activity sensitive to oxidation-reduction.
  • This redox-sensitive control mechanism specifically targets AP-1, influencing the binding of pre-existing Fos and Jun proteins.
  • The findings provide insights into a novel regulatory pathway for AP-1 activity.