Specificity of methylation mediated by the COPR5–PRMT5‐containing complex. Specificity of methylation mediated by the COPR5–PRMT5‐containing complex. (A)

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Presentation transcript:

Specificity of methylation mediated by the COPR5–PRMT5‐containing complex. Specificity of methylation mediated by the COPR5–PRMT5‐containing complex. (A) GST‐COPR5 beads were incubated with nuclear extracts from U2OS cells treated with either siRNA directed against PRMT5 (siPRMT5) or scrambled siRNA (siScr). PRMT5 depletion was assessed by immunoblotting (upper panel). Cellular proteins bound to COPR5 beads were used in 3H‐SAM‐dependent methylation assays in vitro in the absence (−) or presence of substrates: bulk of purified histones (His), recombinant H3r and H4r and MBP. Substrates were visualized by Coomassie staining (middle panels) and their methylation analysed by fluorography (lower panels). (B) COPR5‐bound PRMT5 methylates histone H4 in R3. Methylation assays were performed as in (A) towards synthetic peptides corresponding to the amino termini of H4, H4 modified on R3 by dimethylation (H4R3me2s), H4 with an acetylated lysine in the place of R3 (H4R3Kac) or H3. Similar amounts of peptides (upper panel) were methylated and analysed by fluorography (lower panel). (C) Cellular depletion of COPR5 modified the activity and specificity of nuclear PRMT5 towards histones. U2OS cells were infected with retroviral shRNAs directed against COPR5 (shCOPR5) or control target (shluc), and transfected with Flag‐PRMT5. Anti‐Flag immunoprecipitation of PRMT5 was performed on nuclear extracts prepared from these cells (upper panel) and precipitates were used to methylate either total histones (His) or recombinant H4r in vitro. Substrates were analysed for protein content by Coomassie staining (middle panel) and for methylation by fluorography (lower panel). (D) COPR5 depletion by shCOPR5 was assessed by immunoblotting on nuclear (N) and cytoplasmic extracts (C). As a control of fractionation, samples were also probed for the nuclear protein TBP. COPR5, cooperator of PRMT5; GST, glutathione‐S‐transferase; MBP, myelin basic protein; PRMT5, protein arginine methyltransferase 5; SAM, S‐adenosylmethionine; shRNA, short hairpin RNA; siRNA, short interfering RNA; TBP, TATA‐binding protein. Matthieu Lacroix et al. EMBO Rep. 2008;9:452-458 © as stated in the article, figure or figure legend