ArticlebioRxiv : the preprint server for biology2025
The conserved N-terminal SANT1-binding domain (SBD) of EZH2 Regulates PRC2 Activity.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Polycomb group proteins maintain gene expression patterns established during early development, with Polycomb Repressive Complex 2 (PRC2) methyltransferase a key regulator of cell differentiation, identity and plasticity. Consequently, extensive somatic mutations in PRC2, including gain- or loss- of function (GOF or LOF), are observed in human cancers. The regulation of chromatin structure by PRC2 is critically dependent on its EZH2 (Enhancer of Zeste Homolog 2) subunit, which catalyzes the methylation of histone H3 lysine 27 (H3K27). Recent structural studies of PRC2 revealed extensive conformational changes in the non-catalytic EZH2 N-terminal SANT-Binding Domain (SBD) during PRC2 activation, though the functional significance remains unclear. Here, we investigate how the SBD regulates PRC2 function. The domain is highly conserved in metazoans, dispensable for PRC2 assembly and chromatin localization, yet required for genome-wide histone H3K27 methylation. Further, we show that an intact SBD is necessary for the proliferation of EZH2- addicted lymphomas, and its deletion in the presence of
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