Rev-ErbA beta (Rev-erbβ) also known as NR1D2 (nuclear receptor subfamily 1, group D, member 2) is a protein that in humans is encoded by the NR1D2gene.[1][2]
Rev-erbβ is similar to Rev-erbα in its protein structure and function as a transcriptional repressor. The crystal structure of an unliganded Rev-erbβ ligand-binding domain (LBD) has been resolved (see figure to the right) and shows an extremely small ligand-binding pocket.[5] However, Rev-erbβ has been shown to interact with heme, which appears important for its function.[6]
The structure of Rev-erbβ complexed with heme (see figure to the left) shows a substantial movement of helices 1 (N-terminus ) and 11 (C-terminus ) which opens up a large binding pocket in the interior of the protein that is able to accommodate this ligand.[7]
Function
Rev-erbβ has been implicated in the control of lipid and energy homoeostasis in skeletal muscle.[8]
Rev-erbβ is also a circadian regulated gene; its mRNA displays rhythmic expression in vivo and in serum-synchronized cell cultures. However, it is currently unknown to what extent Rev-erbβ contributes to oscillations of the core circadian clock. However it has been shown heme suppresses hepatic gluconeogenic gene expression and glucose output through the related Rev-erbα receptor which mediates gene repression. Hence, the Rev-erbα receptor detects heme and thereby coordinates the cellular clock, glucose homeostasis, and energy metabolism.[9]
References
↑Dumas B, Harding HP, Choi HS, Lehmann KA, Chung M, Lazar MA, Moore DD (August 1994). "A new orphan member of the nuclear hormone receptor superfamily closely related to Rev-Erb". Molecular Endocrinology. 8 (8): 996–1005. doi:10.1210/me.8.8.996. PMID7997240.
↑Koh YS, Moore DD (April 1999). "Linkage of the nuclear hormone receptor genes NR1D2, THRB, and RARB: evidence for an ancient, large-scale duplication". Genomics. 57 (2): 289–92. doi:10.1006/geno.1998.5683. PMID10198169.
↑Bonnelye E, Vanacker JM, Desbiens X, Begue A, Stehelin D, Laudet V (December 1994). "Rev-erb beta, a new member of the nuclear receptor superfamily, is expressed in the nervous system during chicken development". Cell Growth & Differentiation. 5 (12): 1357–65. PMID7696184.
↑Giambiagi N, Cassia R, Petropoulos I, Part D, Cereghini S, Zakin MM, Ochoa A (December 1995). "Rev-erb beta 2, a novel isoform of the Rev-erb family of orphan nuclear receptors". Biochemistry and Molecular Biology International. 37 (6): 1091–1102. PMID8747539.
↑Woo EJ, Jeong DG, Lim MY, Jun Kim S, Kim KJ, Yoon SM, Park BC, Ryu SE (October 2007). "Structural insight into the constitutive repression function of the nuclear receptor Rev-erbbeta". Journal of Molecular Biology. 373 (3): 735–44. doi:10.1016/j.jmb.2007.08.037. PMID17870090.
↑Ramakrishnan SN, Lau P, Burke LJ, Muscat GE (March 2005). "Rev-erbbeta regulates the expression of genes involved in lipid absorption in skeletal muscle cells: evidence for cross-talk between orphan nuclear receptors and myokines". The Journal of Biological Chemistry. 280 (10): 8651–9. doi:10.1074/jbc.M413949200. PMID15623503.
↑Yin L, Wu N, Curtin JC, Qatanani M, Szwergold NR, Reid RA, Waitt GM, Parks DJ, Pearce KH, Wisely GB, Lazar MA (December 2007). "Rev-erbα, a heme sensor that coordinates metabolic and circadian pathways". Science. 318 (5857): 1786–9. doi:10.1126/science.1150179. PMID18006707.
Further reading
Ramakrishnan SN, Lau P, Crowther LM, Cleasby ME, Millard S, Leong GM, Cooney GJ, Muscat GE (October 2009). "Rev-erb beta regulates the Srebp-1c promoter and mRNA expression in skeletal muscle cells". Biochemical and Biophysical Research Communications. 388 (4): 654–9. doi:10.1016/j.bbrc.2009.08.045. PMID19682428.
