In global genome nucleotide excision repair (GG-NER), just like in transcription-coupled nucleotide excision repair (TC-NER), the cleavage of the damaged strand of DNA 5' to the site of damage occurs at the junction of single-stranded DNA and double-stranded DNA that is formed when the DNA duplex is unwound. The 5' incision is carried out by the ERCC1:XPF (ERCC1:ERCC4) complex and precedes the 3' incision (Staresincic et al. 2009).
Wijgers, N, Staresincic, L, Schärer, OD, Gourdin, AM, Fagbemi, AF, Enzlin, JH, Dunand-Sauthier, I, Clarkson, SG, Giglia-Mari, G, Vermeulen, W
endonuclease activity of GG-NER incision complex:Open bubble dsDNA [nucleoplasm]
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