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-Structure paper
| タイトル | CTCF and R-loops are boundaries of cohesin-mediated DNA looping. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 83, Issue 16, Page 2856-22871.e8, Year 2023 |
| 掲載日 | 2023年8月17日 |
著者 | Hongshan Zhang / Zhubing Shi / Edward J Banigan / Yoori Kim / Hongtao Yu / Xiao-Chen Bai / Ilya J Finkelstein / ![]() |
| PubMed 要旨 | Cohesin and CCCTC-binding factor (CTCF) are key regulatory proteins of three-dimensional (3D) genome organization. Cohesin extrudes DNA loops that are anchored by CTCF in a polar orientation. Here, ...Cohesin and CCCTC-binding factor (CTCF) are key regulatory proteins of three-dimensional (3D) genome organization. Cohesin extrudes DNA loops that are anchored by CTCF in a polar orientation. Here, we present direct evidence that CTCF binding polarity controls cohesin-mediated DNA looping. Using single-molecule imaging, we demonstrate that a critical N-terminal motif of CTCF blocks cohesin translocation and DNA looping. The cryo-EM structure of the cohesin-CTCF complex reveals that this CTCF motif ahead of zinc fingers can only reach its binding site on the STAG1 cohesin subunit when the N terminus of CTCF faces cohesin. Remarkably, a C-terminally oriented CTCF accelerates DNA compaction by cohesin. DNA-bound Cas9 and Cas12a ribonucleoproteins are also polar cohesin barriers, indicating that stalling may be intrinsic to cohesin itself. Finally, we show that RNA-DNA hybrids (R-loops) block cohesin-mediated DNA compaction in vitro and are enriched with cohesin subunits in vivo, likely forming TAD boundaries. |
リンク | Mol Cell / PubMed:37536339 |
| 手法 | EM (単粒子) |
| 解像度 | 6.5 Å |
| 構造データ | EMDB-32252, PDB-7w1m: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-BEF: ![]() ChemComp-ZN: |
| 由来 |
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キーワード | DNA BINDING PROTEIN/DNA / Cohesin / NIPBL / CTCF / DNA / chromosome folding / topologically associating domain / chromatin loops / DNA loop extrusion / sister chromatid cohesion / complex / ATPase / HEAT repeat protein / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex |
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