- EMDB-52748: Ku from Mycobacterium tuberculosis bound to DNA -
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基本情報
登録情報
データベース: EMDB / ID: EMD-52748
タイトル
Ku from Mycobacterium tuberculosis bound to DNA
マップデータ
試料
複合体: KuTB-DNA complex
タンパク質・ペプチド: Non-homologous end joining protein Ku
DNA: DNA 1
DNA: DNA 2
リガンド: water
キーワード
DNA repair / tuberculosis / NHEJ / DNA BINDING PROTEIN
機能・相同性
機能・相同性情報
positive regulation of ligase activity / DNA helicase complex / double-strand break repair via nonhomologous end joining / double-stranded DNA binding / DNA recombination / protein homodimerization activity 類似検索 - 分子機能
Non-homologous end joining protein Ku, prokaryotic type / Ku70/Ku80 beta-barrel domain / Ku70 and Ku80 are 70kDa and 80kDa subunits of the Lupus Ku autoantigen / Ku70/Ku80 beta-barrel domain / SPOC-like, C-terminal domain superfamily 類似検索 - ドメイン・相同性
ジャーナル: Nat Commun / 年: 2025 タイトル: Oligomerisation of Ku from Mycobacterium tuberculosis promotes DNA synapsis. 著者: Sayma Zahid / Sonia Baconnais / Henrietta Smith / Saseela Atwal / Lucy Bates / Harriet Read / Ankita Chadda / Florian Morati / Tom Bedwell / Emil G P Stender / Joanne Walter / Steven W ...著者: Sayma Zahid / Sonia Baconnais / Henrietta Smith / Saseela Atwal / Lucy Bates / Harriet Read / Ankita Chadda / Florian Morati / Tom Bedwell / Emil G P Stender / Joanne Walter / Steven W Hardwick / Fredrik Westerlund / Eric Galburt / Eric Le Cam / Alice Pyne / Galina V Mukamolova / Amanda K Chaplin / 要旨: Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis (TB), is estimated to infect nearly one-quarter of the global population. A key factor in its resilience and persistence is its ...Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis (TB), is estimated to infect nearly one-quarter of the global population. A key factor in its resilience and persistence is its robust DNA repair capacity. Non-homologous end joining (NHEJ) is the primary pathway for repairing DNA double-strand breaks (DSBs) in many organisms, including Mtb, where it is mediated by the Ku protein and the multifunctional LigD enzyme. In this study, we demonstrate that Ku is essential for mycobacterial survival under DNA-damaging conditions. Using cryogenic electron microscopy (cryo-EM), we solved high-resolution structures of both the apo and DNA-bound forms of the Ku-Mtb homodimer. Our structural and biophysical analyses reveal that Ku forms an extended proteo-filament upon binding DNA. We identify critical residues involved in filament formation and DNA synapsis and show that their mutation severely impairs bacterial viability. Furthermore, we propose a model in which the C-terminus of Ku regulates DNA binding and loading and facilitates subsequent recruitment of LigD. These findings provide unique insights into bacterial DNA repair and guide future therapeutics.