A cooperative activation loop among SWI/SNF, γ‐H2AX and H3 acetylation for DNA double‐strand break repair BRG1 binds to γ‐H2AX nucleosomes by interacting.

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A cooperative activation loop among SWI/SNF, γ‐H2AX and H3 acetylation for DNA double‐strand break repair BRG1 binds to γ‐H2AX nucleosomes by interacting with acetylated H3 through its bromodomain. (A) f‐H2AX cells were transfected with empty vector, or the expression vectors for the full‐length BRG1 or the BRD‐deleted BRG1 (BRG1ΔBRD). Flag‐tagged nucleosomes were immunoprecipitated at 1 h after 10‐Gy IR and analysed for associating proteins by immunoblot. (B) f‐H2AX and f‐S139A cells were transfected with empty vector (V) or the expression vector for myc‐tagged BRG1 BRD (Myc‐BRD, b). Flag‐tagged nucleosomes were immunoprecipitated at 1 h after 10‐Gy IR and analysed for associating proteins by immunoblot. Non‐specific (NS) bands are also indicated. (C) f‐H2AX (lane 1) and f‐S139A (lane 2) cells were exposed to 10‐Gy IR, and after 1 h, cells were collected and subjected to the affinity purification of flag‐tagged nucleosomes. Coomassie stain gel of the purified nucleosomes is shown. (D) The GST proteins containing the 588–748 aa of BRG1 (lane 1) or the BRG1 BRD (lane 2) were expressed and purified from Escherichia coli, and analysed on an SDS gel with coomassie stain. (E) The purified flag‐tagged nucleosomes shown in (C) were analysed for γ‐H2AX and H3K14ac by immunoblot. (F) Affinity‐purified f‐S139A and f‐H2AX nucleosomes were incubated with buffer only (lanes 1 and 4) or GST‐BRD at increasing molar ratios of 1:2 (lanes 2 and 5) or 1:8 (lanes 3 and 6). Flag‐tagged nucleosomes were immunoprecipitated and analysed for associating proteins by immunoblot. (G) Affinity‐purified f‐H2AX nucleosomes were incubated with buffer only (lanes 1 and 7) or indicated GST proteins at increasing molar ratios of 1:1 (lanes 2 and 8), 1:2 (lanes 3 and 9), 1:4 (lanes 4 and 10), 1:8 (lanes 5 and 11) or 1:16 (lanes 6 and 12). The nucleosomes were immunoprecipitated and analysed for associating proteins by immunoblot. (H) Verification of synthetic peptides by immunoblot analysis. Unmodified and K14‐acetylated H3 peptides (left panel), and unmodified and S139‐phosphorylated H2AX peptides (right panel) were run on 18% SDS gel and subjected to immunoblot with specific antibodies as indicated. (I) Indicated biotinylated peptides (5 μg/ml) were incubated with buffer only (lanes 1, 4, 7 and 10) or purified SWI/SNF complexes at the concentrations of 0.2 μg/ml (lanes 2, 5, 8 and 11) or 0.8 μg/ml (lanes 3, 6, 9 and 12). Peptide‐protein complexes were pull downed by streptavidin‐coated beads and the bead‐bound proteins were analysed by immunoblot. IF THIS IMAGE HAS BEEN PROVIDED BY OR IS OWNED BY A THIRD PARTY, AS INDICATED IN THE CAPTION LINE, THEN FURTHER PERMISSION MAY BE NEEDED BEFORE ANY FURTHER USE. PLEASE CONTACT WILEY'S PERMISSIONS DEPARTMENT ON PERMISSIONS@WILEY.COM OR USE THE RIGHTSLINK SERVICE BY CLICKING ON THE 'REQUEST PERMISSIONS' LINK ACCOMPANYING THIS ARTICLE. WILEY OR AUTHOR OWNED IMAGES MAY BE USED FOR NON-COMMERCIAL PURPOSES, SUBJECT TO PROPER CITATION OF THE ARTICLE, AUTHOR, AND PUBLISHER. EMBO J, Volume: 29, Issue: 8, Pages: 1434-1445, First published: 11 March 2010, DOI: (10.1038/emboj.2010.27)