DNA repair protein complementing XP-C cells (XPC)

Involved in global genome nucleotide excision repair (GG-NER) by acting as damage sensing and DNA-binding variable component of this XPC complex. Has only a low DNA repair activity by itself that is stimulated by RAD23B and RAD23A.

Has a preference to bind DNA comprising a short single-stranded segment but to not damaged oligonucleotides. This feature is suggested to be connected to a dynamic sensor function: XPC can rapidly screen duplex DNA for non-hydrogen-bonded foundations by forming a transient nucleoprotein intermediate complicated which evolves into a steady recognition complex through an intrinsic single-stranded DNA- binding activity.