Abstract
The euchromatin histone methyltransferase 2 (also known as G9a) methylates histone H3K9 to repress gene expression, but it also acts as a coactivator for some nuclear receptors. The molecular mechanisms underlying this activation remain elusive. Here we show that G9a functions as a coactivator of the endogenous oestrogen receptor α (ERα) in breast cancer cells in a histone methylation-independent manner. G9a dimethylates ERα at K235 both in vitro and in cells. Dimethylation of ERαK235 is recognized by the Tudor domain of PHF20, which recruits the MOF histone acetyltransferase (HAT) complex to ERα target gene promoters to deposit histone H4K16 acetylation promoting active transcription. Together, our data suggest the molecular mechanism by which G9a functions as an ERα coactivator. Along with the PHF20/MOF complex, G9a links the crosstalk between ERα methylation and histone acetylation that governs the epigenetic regulation of hormonal gene expression.
| Original language | English (US) |
|---|---|
| Article number | 10810 |
| Journal | Nature communications |
| Volume | 7 |
| DOIs | |
| State | Published - Mar 10 2016 |
Funding
We thank M. Barton, J. Tyler, M. Lee, T. Jenuwein and Y. Tanaka for reagents. We thank Dr Briana Dennehey and Joseph Munch for comments and editing the manuscript. We thank the MD Anderson Sequencing and Microarray Facility and the Science Park Next-Generation Sequencing Facility (CPRIT RP120348) for Solexa sequencing and the Protein Array and Analysis Core (RP130432) for the protein domain array work. This work was supported by grants to X.S. (American Cancer Society RSG-13-290-01-TBE, CPRIT RP110471, RP140323, Welch G1719 and the Jeanne F. Shelby Scholarship Fund), W.L. (CPRIT RP110471, RP150292 and NIH HG007538), M.T.B. (CPRIT RP110471 and NIH DK062248) and T.G.K. (NIH GM101664). X.Z. is a MDACC Center for Cancer Epigenetics Postdoctoral Scholar. B.J.K. is an American Heart Association Postdoctoral Fellow. W.L. is a Duncan Scholar. X.S. is an R. Lee Clark Fellow.
ASJC Scopus subject areas
- General Chemistry
- General Biochemistry, Genetics and Molecular Biology
- General Physics and Astronomy