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Journal: bioRxiv
Article Title: EZH2 Serine 21 Phosphorylation Restrains Compact-State PRC2 Activation and H3K27me3 Propagation
doi: 10.64898/2026.06.02.729660
Figure Lengend Snippet: A. Domain schematic of the purified recombinant core PRC2 subunits EZH2, SUZ12, EED, and RBBP4, with annotated phosphorylation sites. Yellow circles denote phosphorylation sites reported in high-throughput proteomic studies, and red circles denote sites reported in low-throughput studies. B. In vitro histone methyltransferase assays comparing untreated recombinant PRC2 and PRC2 dephosphorylated with lambda phosphatase. Sf9-purified PRC2 complexes were incubated with recombinant nucleosomes and a 2-fold serial dilution of stimulatory H3K27me3 peptide, beginning at 40 μM. Reaction products were analyzed by immunoblotting. C. Quantification of PRC2 catalytic activity in response to increasing concentrations of stimulatory H3K27me3 peptide. Untreated or lambda phosphatase-treated recombinant PRC2 was incubated with recombinant nucleosomes, and methyltransferase activity was measured by incorporation of 3 H-SAM. Data are shown as mean ± SEM. D. In vitro methyltransferase activity of recombinant PRC2 complexes containing wild-type EZH2, EZH2 S21D, or EZH2 S21A, assayed before or after lambda phosphatase treatment. Complexes were incubated with recombinant nucleosomes, and activity was quantified by incorporation of 3 H-SAM. Data are shown as mean ± SEM, with individual replicate values indicated. Statistical comparisons are indicated above the bars. E. EZH2 domain schematic and multiple sequence alignment of the conserved N-terminal region surrounding S21. The AKT1 consensus motif and S21 residue are indicated. F. Immunoblot analysis of Ezh2 knockout MEFs reconstituted with FLAG-tagged wild-type EZH2, S21D, S21A, or empty vector. GAPDH serves as a loading control. G. Heatmaps and aggregate profiles showing spike-in-normalized H3K27me3 and EZH2 ChIP-seq signal centered on H3K27me3 or EZH2 peaks in Ezh2 -knockout MEFs expressing the indicated EZH2 transgenes or empty vector. ChIP-seq experiments were normalized using exogenous spike-in chromatin. H. Representative genome browser tracks showing spike-in-normalized H3K27me3 and EZH2 ChIP-seq signal at Polycomb target loci in Ezh2 -knockout MEFs expressing the indicated EZH2 transgenes or empty vector. I. Immunoblot analysis of FLAG coimmunoprecipitation from nuclear extracts of Ezh2 knockout MEFs expressing the indicated FLAG-tagged EZH2 transgenes or empty vector control.
Article Snippet:
Techniques: Purification, Recombinant, Phospho-proteomics, High Throughput Screening Assay, In Vitro, Incubation, Serial Dilution, Western Blot, Activity Assay, Sequencing, Residue, Knock-Out, Plasmid Preparation, Control, ChIP-sequencing, Expressing