Polycomb protein EED (EED)

The Polycomb protein EED (EED) is a core scaffold subunit of the Polycomb repressive complex 2 (PRC2), a key epigenetic regulator that mediates the trimethylation of histone H3 at lysine 27 (H3K27me3) [1, 7]. EED contains a WD40 repeat domain that functions as a molecular reader, specifically binding to H3K27me3 marks to allosterically activate the catalytic subunit EZH2, thereby facilitating the propagation of gene silencing across the genome [6, 11]. This mechanism is essential for maintaining cellular identity and regulating embryonic development, but its dysregulation is a hallmark of various malignancies, including lymphomas and solid tumors, where it promotes the silencing of tumor suppressor genes [7, 10, 15]. Therapeutic strategies targeting EED include allosteric inhibitors that block the H3K27me3 binding pocket, protein-protein interaction (PPI) inhibitors, and proteolysis-targeting chimeras (PROTACs) [7, 13]. These agents, such as MAK683 and APG-5918, aim to destabilize the PRC2 complex and restore the expression of silenced genes, offering a promising alternative to direct EZH2 inhibitors, particularly in overcoming acquired resistance [5, 21].

Other names

Embryonic ectoderm development proteinhEEDWAIT-1WD protein associating with integrin cytoplasmic tails 1HEED

Allosteric inhibition of Polycomb repressive complex 2 (PRC2) by binding to the EED subunit, which prevents the recognition of H3K27me3 and blocks the allosteric activation of the catalytic subunit EZH2, thereby reducing repressive histone methylation and reactivating silenced genes [6, 7, 13].