ArticlebioRxiv : the preprint server for biology2024
The KU70-SAP domain has an overlapping function with DNA-PKcs in limiting the lateral movement of KU along DNA.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The non-homologous end-joining (NHEJ) pathway is critical for DNA double-strand break repair and is essential for lymphocyte development and maturation. The Ku70/Ku80 heterodimer (KU) binds to DNA ends, initiating NHEJ and recruiting additional factors, including DNA-dependent protein kinase catalytic subunit (DNA-PKcs) that caps the ends and pushes KU inward. The C-terminus of Ku70 in higher eukaryotes includes a flexible linker and a SAP domain, whose physiological role remains poorly understood. To investigate this, we generated a mouse model with knock-in deletion of the SAP domain ( Highlight: Ku70 is a conserved non-homologous end-joining (NHEJ) factor. Using genetically engineered mouse models and biochemical analyses, our study uncovered a previously unappreciated role of the C-terminal SAP domain of Ku70 in limiting the lateral movement of KU on DNA ends and ensuring end protection. The presence of DNA-PKcs partially masks this role of the SAP domain.
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