Download MendeleyCryo-EM structure of a DNA-PK trimer: higher order oligomerisation in NHEJ.
Hardwick, S.W., Stavridi, A.K., Chirgadze, D.Y., De Oliveira, T.M., Charbonnier, J.B., Ropars, V., Meek, K., Blundell, T.L., Chaplin, A.K.(2023) Structure 31: 895
- PubMed: 37311458
- DOI: https://doi.org/10.1016/j.str.2023.05.013
- Primary Citation of Related Structures:
8BOT - PubMed 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 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.
- Cryo-EM Facility, Department of Biochemistry, University of Cambridge, Sanger Building, Tennis Court Road, CB2 1GA Cambridge, UK.
Organizational Affiliation:
