- EMDB-44534: Human DNA polymerase theta helicase domain tetramer in the apo form -
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基本情報
登録情報
データベース: EMDB / ID: EMD-44534
タイトル
Human DNA polymerase theta helicase domain tetramer in the apo form
マップデータ
Combined tetramer map
試料
複合体: Human DNA polymerase theta helicase domain
タンパク質・ペプチド: DNA polymerase theta
キーワード
DNA repair / TMEJ / MMEJ / DNA binding protein
機能・相同性
機能・相同性情報
double-strand break repair via alternative nonhomologous end joining / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / replication fork processing / site of DNA damage / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / error-prone translesion synthesis / negative regulation of double-strand break repair via homologous recombination ...double-strand break repair via alternative nonhomologous end joining / HDR through MMEJ (alt-NHEJ) / single-stranded DNA helicase activity / replication fork processing / site of DNA damage / mitochondrial nucleoid / 5'-deoxyribose-5-phosphate lyase activity / somatic hypermutation of immunoglobulin genes / error-prone translesion synthesis / negative regulation of double-strand break repair via homologous recombination / RNA-directed DNA polymerase activity / DNA helicase activity / base-excision repair / protein homooligomerization / RNA-directed DNA polymerase / double-strand break repair / site of double-strand break / DNA helicase / damaged DNA binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA repair / DNA damage response / chromatin binding / magnesium ion binding / Golgi apparatus / ATP hydrolysis activity / nucleoplasm / ATP binding / identical protein binding / nucleus / cytosol 類似検索 - 分子機能
: / DNA_pol_Q helicase like region helical domain / DNA polymerase theta-like, helix-turn-helix domain / Helix-turn-helix domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain ...: / DNA_pol_Q helicase like region helical domain / DNA polymerase theta-like, helix-turn-helix domain / Helix-turn-helix domain / DNA polymerase A / DNA polymerase family A / DNA-directed DNA polymerase, family A, conserved site / DNA polymerase family A signature. / DNA-directed DNA polymerase, family A, palm domain / DNA polymerase A domain / DEAD/DEAH box helicase domain / DEAD/DEAH box helicase / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Ribonuclease H superfamily / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
National Institutes of Health/National Cancer Institute (NIH/NCI)
F32CA288144
米国
National Institutes of Health/National Center for Research Resources (NIH/NCRR)
S10OD032467
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Human polymerase θ helicase positions DNA microhomologies for double-strand break repair. 著者: Christopher J Zerio / Yonghong Bai / Brian A Sosa-Alvarado / Timothy Guzi / Gabriel C Lander / 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.
モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: HOLEY / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 30 sec. 詳細: Grids were glow discharged under vacuum for 30 s at 15 mA in a Pelco easiGlow 91000 Glow Discharge Cleaning System.
凍結
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277 K / 装置: HOMEMADE PLUNGER 詳細: 3 microliters of sample was applied to the surface of the grid, blotted with Whatman 1 filter paper until 2 seconds after the liquid spot on the filter paper stopped spreading, and the grid ...詳細: 3 microliters of sample was applied to the surface of the grid, blotted with Whatman 1 filter paper until 2 seconds after the liquid spot on the filter paper stopped spreading, and the grid was plunged into a liquid ethane pool cooled by liquid nitrogen using a manual plunge freezer..
想定した対称性 - 点群: D2 (2回x2回 2面回転対称) アルゴリズム: FOURIER SPACE / 解像度のタイプ: BY AUTHOR / 解像度: 3.3 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: cryoSPARC (ver. 4.3) 詳細: We performed local refinement of a single protomer and then multiplied the output protomer map to fit the D2 symmetric tetramer map. 使用した粒子像数: 208545
Chain - Chain ID: A / Chain - Residue range: 67-892 / Chain - Source name: PDB / Chain - Initial model type: experimental model
詳細
We used ISOLDE to flexibly fit one protomer into the locally refined protomer map. The output protomer model was multiplied and we used ISOLDE to fit four protomers into the tetramer map.
精密化
空間: REAL / プロトコル: FLEXIBLE FIT / 温度因子: 54.43 当てはまり具合の基準: Cross-correlation coefficient
得られたモデル
PDB-9bh6: Human DNA polymerase theta helicase domain tetramer in the apo form