Abstract
Estrogen-related receptors (ERRα/β/γ) are orphan nuclear receptors that function in energy-demanding physiological processes, as well as in development and stem cell maintenance, but mechanisms underlying target gene activation by ERRs are largely unknown. Here, reconstituted biochemical assays that manifest ERR-dependent transcription have revealed two complementary mechanisms. On DNA templates, ERRs activate transcription with just the normal complement of general initiation factors through an interaction of the ERR DNA-binding domain with the p52 subunit of initiation factor TFIIH. On chromatin templates, activation by ERRs is dependent on AF2 domain interactions with the cell-specific coactivator PGC-1α, which in turn recruits the ubiquitous p300 and MED1/Mediator coactivators. This role of PGC-1α may also be fulfilled by other AF2-interacting coactivators like NCOA3, which is shown to recruit Mediator selectively to ERRβ and ERRγ. Importantly, combined genetic and RNA-seq analyses establish that both the TFIIH and the AF2 interaction-dependent pathways are essential for ERRβ/γ-selective gene expression and pluripotency maintenance in embryonic stem cells in which NCOA3 is a critical coactivator.
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Acknowledgements
This work was supported by NIH grants DK071900 and CACA234575 to R.G.R. T.N. was supported by JSPS KAKENHI (19K07651). M.S. was supported by JSPS KAKENHI (19K06482), K.I. by an NCI T32 grant (CA009673) and a JSPS fellowship for research abroad, and M.A.C. by an American Cancer Society Eastern Division — New York Cancer Research Fund Postdoctoral Fellowship. We thank Drs. Vincent Giguere for anti-ERRα antibody, Takashi Onikubo for a critical review of the manuscript, Masashi Yamaji for technical advice on CFA, Koji Hisatake for TFIIH expression constructs, and Roeder laboratory members for various assistance. We also acknowledge invaluable services from The Rockefeller University Flow Cytometry Resource Center (Svetlana Mazel, Director) and the Genomics Research Center (Connie Zhao, Director).
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T.N. and R.G.R. planned the project. T.N. designed and conducted all experiments. M.S. provided the chromatin system. K.I. established ERRβ-KO ESCs and managed RNA-seq analysis. C.-S.C. and K.K. performed NGS data analyses. M.A.C. prepared anti-MED30 antibody and supported experiments with Mediator. R.M. supported ChIP experiments. T.N., S.M., and R.G.R. wrote the manuscript. All authors discussed the results and commented on the manuscript. R.G.R. supervised the overall work.
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Nakadai, T., Shimada, M., Ito, K. et al. Two target gene activation pathways for orphan ERR nuclear receptors. Cell Res 33, 165–183 (2023). https://doi.org/10.1038/s41422-022-00774-z
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DOI: https://doi.org/10.1038/s41422-022-00774-z
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