- EMDB-45218: Human DNA polymerase theta helicase domain in microhomology annea... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-45218
タイトル
Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
マップデータ
試料
複合体: Human DNA polymerase theta helicase domain in microhomology annealed state 2, dimer form
DNA: DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*CP*CP*CP*GP*GP*G)-3')
タンパク質・ペプチド: DNA polymerase theta
キーワード
DNA repair / helicase / ATPase / TRANSFERASE-DNA complex
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 / mitochondrial nucleoid / site of DNA damage / 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 / mitochondrial nucleoid / site of DNA damage / 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 / DNA helicase activity / RNA-directed DNA polymerase activity / base-excision repair / protein homooligomerization / RNA-directed DNA polymerase / double-strand break repair / site of double-strand break / DNA helicase / DNA-directed DNA polymerase / damaged DNA binding / 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 Institute of General Medical Sciences (NIH/NIGMS)
R35 GM152198
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01 AI150524
米国
引用
ジャーナル: bioRxiv / 年: 2024 タイトル: Structural Basis for Polθ-Helicase DNA Binding and Microhomology-Mediated End-Joining. 著者: Fumiaki Ito / Ziyuan Li / Leonid Minakhin / Htet A Khant / Richard T Pomerantz / Xiaojiang S Chen / 要旨: DNA double-strand breaks (DSBs) present a critical threat to genomic integrity, often precipitating genomic instability and oncogenesis. Repair of DSBs predominantly occurs through homologous ...DNA double-strand breaks (DSBs) present a critical threat to genomic integrity, often precipitating genomic instability and oncogenesis. Repair of DSBs predominantly occurs through homologous recombination (HR) and non-homologous end joining (NHEJ). In HR-deficient cells, DNA polymerase theta (Polθ) becomes critical for DSB repair via microhomology-mediated end joining (MMEJ), also termed theta-mediated end joining (TMEJ). Thus, Polθ is synthetically lethal with BRCA1/2 and other HR factors, underscoring its potential as a therapeutic target in HR-deficient cancers. However, the molecular mechanisms governing Polθ-mediated MMEJ remain poorly understood. Here we present a series of cryo-electron microscopy structures of the Polθ helicase domain (Polθ-hel) in complex with DNA containing 3'-overhang. The structures reveal the sequential conformations adopted by Polθ-hel during the critical phases of DNA binding, microhomology searching, and microhomology annealing. The stepwise conformational changes within the Polθ-hel subdomains and its functional dimeric state are pivotal for aligning the 3'-overhangs, facilitating the microhomology search and subsequent annealing necessary for DSB repair via MMEJ. Our findings illustrate the essential molecular switches within Polθ-hel that orchestrate the MMEJ process in DSB repair, laying the groundwork for the development of targeted therapies against the Polθ-hel.