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Ku80, also known as XRCC5, plays a role in many diverse processes including cell signaling, proliferation, DNA repair, replication, transcriptional activation and apoptosis.
As one half of the heterodimer complex Ku, Ku80 is required for proper maintenance of the telomeric C strand. Ku80 also plays a role in DNA repair as an essential subunit of DNA-dependent protein kinase (DNA-PK) that phosphorylates certain transcription factors (Sp1, Oct-1 and p53). The heterodimer Ku binds double stranded DNA breaks for non-homologous end joining repair. Ku mutants are defective in T-DNA integration and over-expression confers increased resistance to DNA damage agents and increased susceptibility to T-DNA transformation.
