The ERRs are orphan nuclear receptors, meaning the identity of their endogenous ligand has yet to be unambiguously determined. They are named because of sequence homology with estrogen receptors, but do not appear to bind estrogens or other tested steroid hormones.
ERRs bind enhancers throughout the genome where they exert effects on gene regulation. The ERR family exhibit varying transcriptional activation capabilities and physically interact with the transcriptional co-activators PGC1-alpha and PGC1-beta,[1][2][3][4][5] via their AF-2 domains and the leucine-rich nuclear receptor interacting motifs (LxxLL) present in the PGC-1 proteins,[6] The ERR family have been demonstrated to control energy homeostasis,[6][7] oxidative metabolism,[1][8] and mitochondrial biogenesis,[1] while effecting mammalian physiology in the heart,[9][10][11][12] brown adipose tissue,[13][14][15] white adipose tissue,[16] placenta,[17] macrophages,[2] and demonstrated additional roles in diabetes and cancer.[18] The contributions of individual ERRs to physiology continue to be elucidated through the generation of sophisticated tissue-specific gene knockout mouse models.
↑Huss JM, Kopp RP, Kelly DP (October 2002). "Peroxisome proliferator-activated receptor coactivator-1alpha (PGC-1alpha) coactivates the cardiac-enriched nuclear receptors estrogen-related receptor-alpha and -gamma. Identification of novel leucine-rich interaction motif within PGC-1alpha". The Journal of Biological Chemistry. 277 (43): 40265–74. doi:10.1074/jbc.M206324200. PMID12181319.
↑Laganière J, Tremblay GB, Dufour CR, Giroux S, Rousseau F, Giguère V (April 2004). "A polymorphic autoregulatory hormone response element in the human estrogen-related receptor alpha (ERRalpha) promoter dictates peroxisome proliferator-activated receptor gamma coactivator-1alpha control of ERRalpha expression". The Journal of Biological Chemistry. 279 (18): 18504–10. doi:10.1074/jbc.M313543200. PMID14978033.
↑Schreiber SN, Knutti D, Brogli K, Uhlmann T, Kralli A (March 2003). "The transcriptional coactivator PGC-1 regulates the expression and activity of the orphan nuclear receptor estrogen-related receptor alpha (ERRalpha)". The Journal of Biological Chemistry. 278 (11): 9013–8. doi:10.1074/jbc.M212923200. PMID12522104.
↑Sladek R, Bader JA, Giguère V (September 1997). "The orphan nuclear receptor estrogen-related receptor alpha is a transcriptional regulator of the human medium-chain acyl coenzyme A dehydrogenase gene". Molecular and Cellular Biology. 17 (9): 5400–9. PMID9271417.
↑Huss JM, Imahashi K, Dufour CR, Weinheimer CJ, Courtois M, Kovacs A, Giguère V, Murphy E, Kelly DP (July 2007). "The nuclear receptor ERRalpha is required for the bioenergetic and functional adaptation to cardiac pressure overload". Cell Metabolism. 6 (1): 25–37. doi:10.1016/j.cmet.2007.06.005. PMID17618854.
↑Alaynick WA, Kondo RP, Xie W, He W, Dufour CR, Downes M, Jonker JW, Giles W, Naviaux RK, Giguère V, Evans RM (July 2007). "ERRgamma directs and maintains the transition to oxidative metabolism in the postnatal heart". Cell Metabolism. 6 (1): 13–24. doi:10.1016/j.cmet.2007.06.007. PMID17618853.
↑Dufour CR, Wilson BJ, Huss JM, Kelly DP, Alaynick WA, Downes M, Evans RM, Blanchette M, Giguère V (May 2007). "Genome-wide orchestration of cardiac functions by the orphan nuclear receptors ERRalpha and gamma". Cell Metabolism. 5 (5): 345–56. doi:10.1016/j.cmet.2007.03.007. PMID17488637.
↑Luo J, Sladek R, Bader JA, Matthyssen A, Rossant J, Giguère V (August 1997). "Placental abnormalities in mouse embryos lacking the orphan nuclear receptor ERR-beta". Nature. 388 (6644): 778–82. doi:10.1038/42022. PMID9285590.
↑Ariazi EA, Jordan VC (2006). "Estrogen-related receptors as emerging targets in cancer and metabolic disorders". Current Topics in Medicinal Chemistry. 6 (3): 203–15. doi:10.2174/156802606776173483. PMID16515477.