DNA repair / helicase / ATPase / TRANSFERASE-INHIBITOR 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 / 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 Institute of General Medical Sciences (NIH/NIGMS)
GM130889
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: Structural basis for a Polθ helicase small-molecule inhibitor revealed by cryo-EM. 著者: Fumiaki Ito / Ziyuan Li / Leonid Minakhin / Gurushankar Chandramouly / Mrityunjay Tyagi / Robert Betsch / John J Krais / Bernadette Taberi / Umeshkumar Vekariya / Marissa Calbert / Tomasz ...著者: Fumiaki Ito / Ziyuan Li / Leonid Minakhin / Gurushankar Chandramouly / Mrityunjay Tyagi / Robert Betsch / John J Krais / Bernadette Taberi / Umeshkumar Vekariya / Marissa Calbert / Tomasz Skorski / Neil Johnson / Xiaojiang S Chen / Richard T Pomerantz / 要旨: DNA polymerase theta (Polθ) is a DNA helicase-polymerase protein that facilitates DNA repair and is synthetic lethal with homology-directed repair (HDR) factors. Thus, Polθ is a promising precision ...DNA polymerase theta (Polθ) is a DNA helicase-polymerase protein that facilitates DNA repair and is synthetic lethal with homology-directed repair (HDR) factors. Thus, Polθ is a promising precision oncology drug-target in HDR-deficient cancers. Here, we characterize the binding and mechanism of action of a Polθ helicase (Polθ-hel) small-molecule inhibitor (AB25583) using cryo-EM. AB25583 exhibits 6 nM IC against Polθ-hel, selectively kills BRCA1/2-deficient cells, and acts synergistically with olaparib in cancer cells harboring pathogenic BRCA1/2 mutations. Cryo-EM uncovers predominantly dimeric Polθ-hel:AB25583 complex structures at 3.0-3.2 Å. The structures reveal a binding-pocket deep inside the helicase central-channel, which underscores the high specificity and potency of AB25583. The cryo-EM structures in conjunction with biochemical data indicate that AB25583 inhibits the ATPase activity of Polθ-hel helicase via an allosteric mechanism. These detailed structural data and insights about AB25583 inhibition pave the way for accelerating drug development targeting Polθ-hel in HDR-deficient cancers.