SUZ12 acts as scaffold for the complex, containing a C-terminal VEFS domain binding to EED and EZH2/1 and a N-terminal domain with associated non-core subunits. Chromatin binding is dependent on the N-terminal part of SUZ12, and CGI residence time may be modulated by non-core subunits, transcriptional activity and colocalizing factors including PRC1, H2AK119ub1 and H3K27me3. The catalytic activity of PRC2 may be influenced by non-core subunits and post-translational modifications of histones (H3K27me3, H3K4me3 and H3K36me2/me3).