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-Structure paper
タイトル | Molecular mechanisms of assembly and TRIP13-mediated remodeling of the human Shieldin complex. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 118, Issue 8, Year 2021 |
掲載日 | 2021年2月23日 |
著者 | Wei Xie / Shengliu Wang / Juncheng Wang / M Jason de la Cruz / Guotai Xu / Maurizio Scaltriti / Dinshaw J Patel / |
PubMed 要旨 | The Shieldin complex, composed of REV7, SHLD1, SHLD2, and SHLD3, protects DNA double-strand breaks (DSBs) to promote nonhomologous end joining. The AAA ATPase TRIP13 remodels Shieldin to regulate DNA ...The Shieldin complex, composed of REV7, SHLD1, SHLD2, and SHLD3, protects DNA double-strand breaks (DSBs) to promote nonhomologous end joining. The AAA ATPase TRIP13 remodels Shieldin to regulate DNA repair pathway choice. Here we report crystal structures of human SHLD3-REV7 binary and fused SHLD2-SHLD3-REV7 ternary complexes, revealing that assembly of Shieldin requires fused SHLD2-SHLD3 induced conformational heterodimerization of open (O-REV7) and closed (C-REV7) forms of REV7. We also report the cryogenic electron microscopy (cryo-EM) structures of the ATPγS-bound fused SHLD2-SHLD3-REV7-TRIP13 complexes, uncovering the principles underlying the TRIP13-mediated disassembly mechanism of the Shieldin complex. We demonstrate that the N terminus of REV7 inserts into the central channel of TRIP13, setting the stage for pulling the unfolded N-terminal peptide of C-REV7 through the central TRIP13 hexameric channel. The primary interface involves contacts between the safety-belt segment of C-REV7 and a conserved and negatively charged loop of TRIP13. This process is mediated by ATP hydrolysis-triggered rotatory motions of the TRIP13 ATPase, thereby resulting in the disassembly of the Shieldin complex. |
リンク | Proc Natl Acad Sci U S A / PubMed:33597306 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.7 - 3.8 Å |
構造データ | EMDB-23244, PDB-7l9p: PDB-6ww9: PDB-6wwa: |
化合物 | ChemComp-AGS: |
由来 |
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キーワード | NUCLEAR PROTEIN / REV7 / SHLD3 / SHLD2 / TRIP13 |