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DNA binding-independent transcriptional activation by the androgen receptor through triggering of coactivators

T Slagsvold1, I Kraus, K Frønsdal

  • 1Biotechnology Centre of Oslo, Department of Biochemistry, University of Oslo, Gaustadalleen 21, 0349 Oslo, Norway.

The Journal of Biological Chemistry
|June 29, 2001
PubMed

Insights

Androgen receptor (AR) can activate gene transcription independently of DNA binding. This novel "triggering" mechanism enhances coactivator activity, offering new insights into AR-mediated gene regulation.

Area of Science:

  • Molecular Biology
  • Endocrinology
  • Cancer Biology

Background:

  • Androgens are crucial for male reproductive system development and prostate cancer progression.
  • Androgen receptor (AR) mediates androgen effects as a ligand-modulated transcription factor.
  • AR typically binds DNA to activate target gene transcription, but can also interact with other factors without DNA binding.

Purpose of the Study:

  • To investigate a novel, DNA-binding-independent transactivation function of the androgen receptor (AR).
  • To characterize the mechanism by which AR influences coactivator activity.
  • To explore the distinct regions of AR and coactivators involved in this novel function.

Main Methods:

  • Investigated ligand-dependent transactivation of AR independent of DNA binding.
  • Assessed the effect of AR on the transcriptional activity of coactivators like GRIP1, CBP, and p300 when tethered to DNA.
  • Compared the AR and coactivator domains required for this DNA-independent function versus canonical AR transactivation.

Main Results:

  • Discovered a novel ligand-dependent transactivation function for AR that does not require DNA binding.
  • AR significantly boosted the intrinsic transcriptional activity of DNA-tethered coactivators (GRIP1, CBP, p300).
  • Identified distinct AR and GRIP1 regions involved in this "triggering" phenomenon compared to DNA-dependent transactivation.

Conclusions:

  • AR possesses a DNA-binding-independent mechanism for regulating transcription, termed "triggering."
  • This "triggering" of coactivator activity by AR may be a significant component of AR-mediated gene regulation.
  • Findings suggest novel regulatory pathways for AR beyond direct DNA interaction, relevant to prostate cancer.

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