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Research Article
Daxx and histone deacetylase II associate with chromatin through an interaction with core histones and the chromatin-associated protein Dek
Andrew D. Hollenbach, Craig J. McPherson, Edwin J. Mientjes, Rekha Iyengar, Gerard Grosveld
Journal of Cell Science 2002 115: 3319-3330;
Andrew D. Hollenbach
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Craig J. McPherson
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Edwin J. Mientjes
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Rekha Iyengar
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Gerard Grosveld
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Summary

Human Daxx is a protein that functions, in part, as a transcriptional co-repressor through its interaction with a growing number of nuclear, DNA-associated proteins. To determine the mechanism by which hDaxx represses transcription, we used conventional chromatography to isolate endogenous hDaxx. We determined that hDaxx has an apparent molecular weight of 360 kDa, which is consistent with the fact that multiple domains of hDaxx are required for transcriptional repression and suggests that hDaxx associates with multiple proteins. Using co-fractionation and co-immunoprecipitation we demonstrate that hDaxx associates with proteins that are critical for transcriptional repression, such as histone deacetylase II, constituents of chromatin such as core histones H2A, H2B, H3 and H4, and Dek, a chromatin-associated protein reported to change the topology of DNA in chromatin in vitro. We also demonstrate a requirement for the SPT domain and the first paired amphipathic helix of hDaxx for its association with histone deacetylase II and acetylated histone H4, respectively. Finally, we provide evidence suggesting that the association of hDaxx with chromatin-related proteins is dependent on the post-translational phosphorylation status of hDaxx. A working model for the repressive action of hDaxx through its association with chromatin related proteins is presented.

  • Daxx
  • HDAC II
  • Histone
  • Dek
  • Accepted May 20, 2002.
  • © The Company of Biologists Limited 2002
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Research Article
Daxx and histone deacetylase II associate with chromatin through an interaction with core histones and the chromatin-associated protein Dek
Andrew D. Hollenbach, Craig J. McPherson, Edwin J. Mientjes, Rekha Iyengar, Gerard Grosveld
Journal of Cell Science 2002 115: 3319-3330;
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Research Article
Daxx and histone deacetylase II associate with chromatin through an interaction with core histones and the chromatin-associated protein Dek
Andrew D. Hollenbach, Craig J. McPherson, Edwin J. Mientjes, Rekha Iyengar, Gerard Grosveld
Journal of Cell Science 2002 115: 3319-3330;

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