Cited by 55Prostate Cancer Treatment and ResearchEstrogen and related hormone effectsSperm and Testicular Function

Ligand Binding to the Androgen Receptor Induces Conformational Changes That Regulate Phosphatase Interactions

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Yang, Chun-Song, Xin, Hong-Wu, Kelley, Joshua B., Spencer, Adam, Brautigan, David L., Paschal, Bryce M.·2007·Molecular and Cellular Biology

Abstract

We describe a mechanism for protein phosphatase 2A (PP2A) targeting to the androgen receptor (AR) and provide insight into the more general issue of kinase and phosphatase interactions with AR. Simian virus 40 (SV40) small t antigen (ST) binding to N-terminal HEAT repeats in the PP2A A subunit induces structural changes transduced to C-terminal HEAT repeats. This enables the C-terminal HEAT repeats in the PP2A A subunit, including HEAT repeat 13, to discriminate between androgen- and androgen antagonist-induced AR conformations. The PP2A-AR interaction was used to show that an AR mutant in prostate cancer cells (T877A) is activated by multiple ligands without acquiring the same conformation as that induced by androgen. The correlation between androgen binding to AR and increased phosphorylation of the activation function 1 (AF-1) region implies that changes in AR conformation or chaperone composition are causal to kinase access to phosphorylation sites. However, AF-1 phosphorylation sites are kinase accessible prior to androgen binding. This suggests that androgens can enhance the phosphorylation state of AR either by negatively regulating the ability of the ligand-binding domain to bind phosphatases or by inducing an AR conformation that is resistant to phosphatase action. SV40 ST subverts this mechanism by promoting the direct transfer of PP2A onto androgen-bound AR, resulting in multisite dephosphorylation.

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Authors
Yang, C.-S., Xin, H.-W., Kelley, J. B., Spencer, A., Brautigan, D. L., & Paschal, B. M.
Affiliations
  • Center for Cell Signaling
  • University of Virginia (US)
Venue
Molecular and Cellular Biology
Published
2007-05-01
Volume
27
Issue
9
Pages
3390-3404
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2134011929
Cited by
55
References
54
Citations by year
2024: 3 · 2023: 3 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 1 · 2017: 4 · 2016: 2 · 2015: 5 · 2014: 3 · 2013: 3 · 2012: 3
FWCI
4.63
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Northwestern University
  • National Institutes of Health
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Treatment and Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Reproductive Medicine › Sperm and Testicular Function
Keywords
androgen receptor, protein phosphatase 2A, ligand binding, receptor conformation, HEAT repeats, SV40 small t antigen, androgen antagonists, dephosphorylation, prostate cancer
MeSH terms
Androgens, Animals, Cell Line, Chlorocebus aethiops, Humans, Ligands, Male, Phosphoprotein Phosphatases, Phosphorylation, Prostatic Neoplasms, Protein Binding, Receptors, Androgen, Transcription, Genetic, Transplantation, Heterologous, Response Elements, Amino Acid Motifs, Protein Subunits, Mice, Protein Phosphatase 2

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