This domain is found in the N-terminal region of xeroderma pigmentosum group B (XPB) helicase present in Archaeoglobus fulgidus. XPB is essential for transcription, nucleotide excision repair, and TFIIH functional assembly. The domain is a damage recognition domain (DRD) which allows XPB to unwind damaged DNA as needed for nucleotide excision repair [1].

1: Conserved XPB core structure and motifs for DNA unwinding: implications for pathway selection of transcription or excision repair. Fan L, Arvai AS, Cooper PK, Iwai S, Hanaoka F, Tainer JA; Mol Cell. 2006;22:27-37. PMID:16600867