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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

A central domain of cyclin D1 mediates nuclear receptor corepressor activity

Christin E Petre-Draviam1, Erin B Williams, Craig J Burd

  • 1Department of Cell Biology, University of Cincinnati College of Medicine, Cincinnati, OH 45267-0521, USA.

Oncogene
|November 24, 2004
PubMed

Insights

Researchers identified a specific region in cyclin D1 that binds and represses the androgen receptor (AR), crucial for developing new prostate cancer therapies.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Endocrinology

Background:

  • Nuclear receptor activity is key in hormone-related cancers.
  • Cyclin D1 modulates nuclear receptors, but the specific regions involved are unclear.

Purpose of the Study:

  • To map the cyclin D1 region responsible for androgen receptor (AR) binding and repression.
  • To investigate the role of this region in transcriptional comodulation and its potential therapeutic applications.

Main Methods:

  • Deletion analysis of cyclin D1 to identify functional domains.
  • Androgen receptor (AR) binding assays.
  • Histone deacetylase 3 (HDAC3) interaction studies.
  • Cell cycle progression assays in prostate cancer cells.

Main Results:

  • A central, alpha-helical domain of cyclin D1 was identified as essential for AR binding and repression.
  • Deletion of this domain abolished AR binding and corepressor activity.
  • This domain is sufficient for AR interaction and binds HDAC3.
  • Overexpression of this domain inhibited cell cycle progression in prostate cancer cells.
  • Repression function is conserved for thyroid hormone receptor beta-1 but not for estrogen receptor activation.

Conclusions:

  • A minimal repression module within cyclin D1 has been identified.
  • Cyclin D1's coactivator and corepressor functions are distinct.
  • The identified cyclin D1 central domain holds potential for novel prostate cancer therapeutics.

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