+検索条件
-Structure paper
| タイトル | Human polymerase θ helicase positions DNA microhomologies for double-strand break repair. |
|---|---|
| ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 32, Issue 6, Page 1061-1068, Year 2025 |
| 掲載日 | 2025年2月28日 |
著者 | Christopher J Zerio / Yonghong Bai / Brian A Sosa-Alvarado / Timothy Guzi / Gabriel C Lander / ![]() |
| PubMed 要旨 | DNA double-strand breaks occur daily in all human cells and must be repaired with high fidelity to minimize genomic instability. Deficiencies in high-fidelity DNA repair by homologous recombination ...DNA double-strand breaks occur daily in all human cells and must be repaired with high fidelity to minimize genomic instability. Deficiencies in high-fidelity DNA repair by homologous recombination lead to dependence on DNA polymerase θ, which identifies DNA microhomologies in 3' single-stranded DNA overhangs and anneals them to initiate error-prone double-strand break repair. The resulting genomic instability is associated with numerous cancers, thereby making this polymerase an attractive therapeutic target. However, despite the biomedical importance of polymerase θ, the molecular details of how it initiates DNA break repair remain unclear. Here, we present cryo-electron microscopy structures of the polymerase θ helicase domain bound to microhomology-containing DNA, revealing DNA-induced rearrangements of the helicase that enable DNA repair. Our structures show that DNA-bound helicase dimers facilitate a microhomology search that positions 3' single-stranded DNA ends in proximity to align complementary bases and anneal DNA microhomology. We characterize the molecular determinants that enable the helicase domain of polymerase θ to identify and pair DNA microhomologies to initiate mutagenic DNA repair, thereby providing insight into potentially targetable interactions for therapeutic interventions. |
リンク | Nat Struct Mol Biol / PubMed:40021738 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.3 - 3.6 Å |
| 構造データ | EMDB-44534, PDB-9bh6: EMDB-44535, PDB-9bh7: EMDB-44536, PDB-9bh8: EMDB-44537, PDB-9bh9: EMDB-44538, PDB-9bha: |
| 由来 |
|
キーワード | DNA BINDING PROTEIN / DNA repair / TMEJ / MMEJ |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク









homo sapiens (ヒト)
キーワード