Journal: Mol Cell / Year: 2021 Title: Cryo-EM of NHEJ supercomplexes provides insights into DNA repair. Authors: Amanda K Chaplin / Steven W Hardwick / Antonia Kefala Stavridi / Christopher J Buehl / Noah J Goff / Virginie Ropars / Shikang Liang / Taiana Maia De Oliveira / Dimitri Y Chirgadze / ...Authors: Amanda K Chaplin / Steven W Hardwick / Antonia Kefala Stavridi / Christopher J Buehl / Noah J Goff / Virginie Ropars / Shikang Liang / Taiana Maia De Oliveira / Dimitri Y Chirgadze / Katheryn Meek / Jean-Baptiste Charbonnier / Tom L Blundell / Abstract: Non-homologous end joining (NHEJ) is one of two critical mechanisms utilized in humans to repair DNA double-strand breaks (DSBs). Unrepaired or incorrect repair of DSBs can lead to apoptosis or ...Non-homologous end joining (NHEJ) is one of two critical mechanisms utilized in humans to repair DNA double-strand breaks (DSBs). Unrepaired or incorrect repair of DSBs can lead to apoptosis or cancer. NHEJ involves several proteins, including the Ku70/80 heterodimer, DNA-dependent protein kinase catalytic subunit (DNA-PKcs), X-ray cross-complementing protein 4 (XRCC4), XRCC4-like factor (XLF), and ligase IV. These core proteins bind DSBs and ligate the damaged DNA ends. However, details of the structural assembly of these proteins remain unclear. Here, we present cryo-EM structures of NHEJ supercomplexes that are composed of these core proteins and DNA, revealing the detailed structural architecture of this assembly. We describe monomeric and dimeric forms of this supercomplex and also propose the existence of alternate dimeric forms of long-range synaptic complexes. Finally, we show that mutational disruption of several structural features within these NHEJ complexes negatively affects DNA repair.
History
Deposition
Feb 5, 2021
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Header (metadata) release
Aug 18, 2021
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Map release
Aug 18, 2021
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Update
Jul 10, 2024
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Current status
Jul 10, 2024
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
UniProtKB: DNA-dependent protein kinase catalytic subunit
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Macromolecule #2: X-ray repair cross-complementing protein 6
Macromolecule
Name: X-ray repair cross-complementing protein 6 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
UniProtKB: X-ray repair cross-complementing protein 6
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Macromolecule #3: X-ray repair cross-complementing protein 5
Macromolecule
Name: X-ray repair cross-complementing protein 5 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
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