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-Structure paper
タイトル | Cryo-EM visualization of DNA-PKcs structural intermediates in NHEJ. |
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ジャーナル・号・ページ | Sci Adv, Vol. 9, Issue 22, Page eadg2838, Year 2023 |
掲載日 | 2023年6月2日 |
![]() | Siyu Chen / Alex Vogt / Linda Lee / Tasmin Naila / Ryan McKeown / Alan E Tomkinson / Susan P Lees-Miller / Yuan He / ![]() ![]() |
PubMed 要旨 | DNA double-strand breaks (DSBs), one of the most cytotoxic forms of DNA damage, can be repaired by the tightly regulated nonhomologous end joining (NHEJ) machinery (Stinson and Loparo and Zhao ). ...DNA double-strand breaks (DSBs), one of the most cytotoxic forms of DNA damage, can be repaired by the tightly regulated nonhomologous end joining (NHEJ) machinery (Stinson and Loparo and Zhao ). Core NHEJ factors form an initial long-range (LR) synaptic complex that transitions into a DNA-PKcs (DNA-dependent protein kinase, catalytic subunit)-free, short-range state to align the DSB ends (Chen ). Using single-particle cryo-electron microscopy, we have visualized three additional key NHEJ complexes representing different transition states, with DNA-PKcs adopting distinct dimeric conformations within each of them. Upon DNA-PKcs autophosphorylation, the LR complex undergoes a substantial conformational change, with both Ku and DNA-PKcs rotating outward to promote DNA break exposure and DNA-PKcs dissociation. We also captured a dimeric state of catalytically inactive DNA-PKcs, which resembles structures of other PIKK (Phosphatidylinositol 3-kinase-related kinase) family kinases, revealing a model of the full regulatory cycle of DNA-PKcs during NHEJ. |
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手法 | EM (単粒子) |
解像度 | 3.6 - 14.0 Å |
構造データ | EMDB-28731, PDB-8ez9: EMDB-28732, PDB-8eza: EMDB-28733, PDB-8ezb: ![]() EMDB-28734: DNA-PKcs monomer in dimer DNA-PKcs complex ![]() EMDB-28735: DNAPKcs-Ku-LigIV(BRCT)-PAXX-DNA subcomplex in PAXX-LR complex ![]() EMDB-28736: XRCC4-XLF-XRCC4 subcomplex of PAXX-LR complex ![]() EMDB-28737: DNA-PKcs without N-terminus in PAXX-LR-ATP complex ![]() EMDB-28738: DNAPKcs-Ku-DNA subcomplex in PAXX-LR-ATP complex ![]() EMDB-28739: XRCC4-XLF-XRCC4 subcomplex in LR-ATP complex |
化合物 | ![]() ChemComp-ATP: ![]() ChemComp-MG: |
由来 |
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![]() | DNA BINDING PROTEIN / Dimer / Kinase / Complex / NHEJ / DNA BINDING PROTEIN/DNA / DNA BINDING PROTEIN-DNA complex |