Journal: Structure / Year: 2023 Title: Cryo-EM structure of a DNA-PK trimer: higher order oligomerisation in NHEJ. Authors: Steven W Hardwick / Antonia Kefala Stavridi / Dimitri Y Chirgadze / Taiana Maia De Oliveira / Jean-Baptiste Charbonnier / Virginie Ropars / Katheryn Meek / Tom L Blundell / Amanda K Chaplin / Abstract: The ability of humans to maintain the integrity of the genome is imperative for cellular survival. DNA double-strand breaks (DSBs) are considered the most critical type of DNA lesion, which can ...The ability of humans to maintain the integrity of the genome is imperative for cellular survival. DNA double-strand breaks (DSBs) are considered the most critical type of DNA lesion, which can ultimately lead to diseases including cancer. Non-homologous end joining (NHEJ) is one of two core mechanisms utilized to repair DSBs. DNA-PK is a key component in this process and has recently been shown to form alternate long-range synaptic dimers. This has led to the proposal that these complexes can be formed before transitioning to a short-range synaptic complex. Here we present cryo-EM data representing an NHEJ supercomplex consisting of a trimer of DNA-PK in complex with XLF, XRCC4, and DNA Ligase IV. This trimer represents a complex of both long-range synaptic dimers. We discuss the potential role of the trimeric structure, and possible higher order oligomers, as structural intermediates in the NHEJ mechanism, or as functional DNA repair centers.
UniProtKB: DNA-dependent protein kinase catalytic subunit
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Macromolecule #5: X-ray repair cross-complementing protein 6
Macromolecule
Name: X-ray repair cross-complementing protein 6 / type: protein_or_peptide / ID: 5 / Number of copies: 3 / 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
+
Macromolecule #6: X-ray repair cross-complementing protein 5
Macromolecule
Name: X-ray repair cross-complementing protein 5 / type: protein_or_peptide / ID: 6 / Number of copies: 3 / Enantiomer: LEVO EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
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