XPF, also called DNA excision repair protein ERCC-4, or DNA repair protein complementing XP-F cells, or Xeroderma pigmentosum group F-complementing protein, is a DNA repair endonuclease that is a catalytic component of a structure-specific DNA repair endonuclease responsible for the 5-prime incision during DNA repair. It is involved in homologous recombination that assists in removing interstrand cross-link. The nuclease domains of the catalytic subunits XPF have the GDX(n)ERKX(3)D motif which is required for metal-dependent endonuclease activity but not for DNA junction binding. XPF-ERRC1 and its yeast homolog Rad1-Rad10 play key roles in the excision of DNA lesions and are required for certain types of homologous recombination events and for the repair of DNA cross-links.
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