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Related Experiment Videos

Rsk2 allosterically activates estrogen receptor alpha by docking to the hormone-binding domain.

D E Clark1, C E Poteet-Smith, J A Smith

  • 1Center for Cell Signaling and PharmaBiologicals, University of Virginia, Charlottesville, VA 22908-0577, USA.

The EMBO Journal
|July 4, 2001
PubMed
Summary

p90 ribosomal S6 kinase 2 (Rsk2) binds estrogen receptor alpha (ERalpha) HBD, enhancing transcription via phosphorylation. This novel mechanism is specific to ERalpha and blocked by 4-hydroxytamoxifen.

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Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Transcriptional Regulation

Background:

  • Estrogen receptor alpha (ERalpha) is a key regulator of gene expression.
  • Protein kinases play crucial roles in cellular signaling pathways.
  • Transcriptional regulation involves complex protein-protein interactions.

Purpose of the Study:

  • To elucidate a novel mechanism of transcriptional regulation involving Rsk2 and ERalpha.
  • To investigate the role of Rsk2 docking to ERalpha's HBD.
  • To understand the specificity of this interaction for ERalpha.

Main Methods:

  • Investigated the interaction between Rsk2 and ERalpha using biochemical assays.
  • Utilized constitutively active Rsk2 mutants to study phosphorylation.

Related Experiment Videos

  • Employed 4-hydroxytamoxifen to block Rsk2-mediated activation.
  • Compared ERalpha and ERbeta interactions with Rsk2.

    • Main Results:

    • Rsk2 docking to ERalpha HBD induces a conformational change enhancing transcription.
    • Rsk2 phosphorylates ERalpha at Ser167 and physically associates with residues 326-394.
    • 4-hydroxytamoxifen inhibits Rsk2-mediated ERalpha activation by masking the docking site.
    • The observed effects are specific to ERalpha, not ERbeta.

    Conclusions:

    • A novel allosteric mechanism for ERalpha transcriptional regulation by Rsk2 docking has been identified.
    • This mechanism involves conformational changes, phosphorylation, and specific protein-protein interactions.
    • Protein kinase docking sites may represent a general mode of allosteric regulation.