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Related Experiment Videos

Two classes of androgen receptor elements mediate cooperativity through allosteric interactions.

K J Reid1, S C Hendy, J Saito

  • 1Prostate Centre at Vancouver General Hospital, Vancouver, British Columbia V6H 3Z6, Canada.

The Journal of Biological Chemistry
|November 1, 2000
PubMed
Summary

Androgen receptor (AR) regulates genes through specific combinations of androgen response elements (AREs). Unique Class II AREs alter DNA structure, enhancing AR binding and gene activation for precise hormonal control.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Endocrinology

Background:

  • Androgen receptor (AR) regulates gene expression through androgen response elements (AREs).
  • Individual AREs often have low DNA binding affinity and transcriptional activity.
  • Combinations of AREs in gene promoters can lead to cooperative binding and enhanced activation.

Purpose of the Study:

  • To investigate how specific combinations of AREs mediate cooperative DNA binding and transcriptional activation by AR.
  • To characterize the distinct classes of AREs in natural AR-regulated promoters.
  • To elucidate the role of nucleotide variation within AREs in AR function and gene regulation.

Main Methods:

  • Analysis of natural androgen-regulated promoters (prostate specific antigen, probasin).

Related Experiment Videos

  • Identification and characterization of two classes of AREs (Class I and Class II).
  • Investigation of AR binding dynamics and DNA structural changes upon binding to different ARE classes.

    • Main Results:

    • Two classes of AREs (Class I and Class II) were identified, differing in nucleotide sequence and function.
    • Class II AREs possess atypical features that induce significant DNA structural alterations upon AR binding.
    • Class II sites allosterically stabilize AR binding to adjacent Class I sites, leading to synergistic transcriptional activity and increased hormone sensitivity.

    Conclusions:

    • Specific nucleotide variations within AR binding sites dictate differential AR functions.
    • Class II AREs play a critical role in enhancing AR binding affinity, transcriptional activity, and hormone sensitivity.
    • This mechanism of complex allosteric interactions mediated by ARE sequence variation may be a universal strategy for AR-mediated gene regulation.