+検索条件
-Structure paper
タイトル | Structural basis of long-range to short-range synaptic transition in NHEJ. |
---|---|
ジャーナル・号・ページ | Nature, Vol. 593, Issue 7858, Page 294-298, Year 2021 |
掲載日 | 2021年4月14日 |
著者 | Siyu Chen / Linda Lee / Tasmin Naila / Susan Fishbain / Annie Wang / Alan E Tomkinson / Susan P Lees-Miller / Yuan He / |
PubMed 要旨 | DNA double-strand breaks (DSBs) are a highly cytotoxic form of DNA damage and the incorrect repair of DSBs is linked to carcinogenesis. The conserved error-prone non-homologous end joining (NHEJ) ...DNA double-strand breaks (DSBs) are a highly cytotoxic form of DNA damage and the incorrect repair of DSBs is linked to carcinogenesis. The conserved error-prone non-homologous end joining (NHEJ) pathway has a key role in determining the effects of DSB-inducing agents that are used to treat cancer as well as the generation of the diversity in antibodies and T cell receptors. Here we applied single-particle cryo-electron microscopy to visualize two key DNA-protein complexes that are formed by human NHEJ factors. The Ku70/80 heterodimer (Ku), the catalytic subunit of the DNA-dependent protein kinase (DNA-PKcs), DNA ligase IV (LigIV), XRCC4 and XLF form a long-range synaptic complex, in which the DNA ends are held approximately 115 Å apart. Two DNA end-bound subcomplexes comprising Ku and DNA-PKcs are linked by interactions between the DNA-PKcs subunits and a scaffold comprising LigIV, XRCC4, XLF, XRCC4 and LigIV. The relative orientation of the DNA-PKcs molecules suggests a mechanism for autophosphorylation in trans, which leads to the dissociation of DNA-PKcs and the transition into the short-range synaptic complex. Within this complex, the Ku-bound DNA ends are aligned for processing and ligation by the XLF-anchored scaffold, and a single catalytic domain of LigIV is stably associated with a nick between the two Ku molecules, which suggests that the joining of both strands of a DSB involves both LigIV molecules. |
リンク | Nature / PubMed:33854234 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.1 - 9.3 Å |
構造データ | EMDB-23509, PDB-7lsy: EMDB-23510, PDB-7lt3: EMDB-23511: EMDB-23512: EMDB-23513: EMDB-23514: EMDB-23515: |
化合物 | ChemComp-ADP: |
由来 |
|
キーワード | DNA BINDING PROTEIN/DNA / NHEJ / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex |