DNA-dependent protein kinase-DNA ligase 4 complex A large protein complex which is involved in the repair of DNA double-strand breaks and, in mammals, V(D)J recombination events. It consists of the DNA-dependent protein kinase catalytic subunit (DNA-PKcs), the DNA end-binding heterodimer Ku, the nuclear phosphoprotein XRCC4 or a homolog thereof, and DNA ligase IV. GO:0005959 GO:0005958 cellular_component nonhomologous end joining complex nuclear protein-containing complex