REV-ERB refers to two closely related nuclear receptors, REV-ERB alpha (NR1D1) and REV-ERB beta (NR1D2). They are unusual in the receptor superfamily because they lack the C-terminal helix 12 needed to recruit coactivators, so they function purely as repressors: ligand-bound REV-ERB occupies ROR response elements and recruits the NCoR/HDAC3 complex. Their natural ligand is heme, which makes them direct sensors of cellular heme status.
Why REV-ERB matters
In the core circadian loop, REV-ERB represses transcription of Bmal1, opposing the activating ROR receptors, and the resulting oscillation sets the phase of downstream clock-controlled genes. Because HDAC3 recruitment also lands on lipogenic and gluconeogenic promoters in liver and on oxidative genes in muscle, REV-ERB is one of the clearest molecular links between circadian timing and metabolism.
Synthetic agonists such as SR9009 (stenabolic) and SR9011 are the reason the term appears in research-compound catalogs. Attribution is important: a 2019 study reported that SR9009 produces metabolic effects in cells lacking REV-ERB entirely, so off-target activity is part of the current literature rather than a footnote. Related metabolic work targets PPAR-delta.
Related terms and material
AMPK · preclinical · research use only. Reference material: metabolic & circadian compounds. Further reading: what is SR9009 and cardarine vs SR9009.