REV-ERBα
REV-ERB alpha, the protein product of NR1D1, is a heme-binding orphan nuclear receptor that acts as a core repressor of the mammalian circadian clock. It competes with ROR activators for RORE elements to rhythmically silence Bmal1 transcription, closing the negative-feedback loop that generates roughly 24-hour gene expression cycles. Beyond the clock, REV-ERB alpha controls hepatic glucose and lipid metabolism, macrophage inflammatory output and muscle mitochondrial function, linking circadian timing to metabolic disease. Synthetic REV-ERB agonists such as SR9009 have shown effects on obesity and inflammation in animals. Recombinant REV-ERB alpha ligand-binding domain is used in heme- and ligand-binding studies and in screens for chronotherapeutic small molecules.
