If you look at the TFIIH p62 subunit N-terminal (BTF2-p62) of the TFIIH basal transcription factor complex, you can see that it is part of the IPR013876 group. This region is necessary for activity because it interacts with the 3' endonuclease XPG. A critical element of the nucleotide excision repair apparatus is the 3' endonuclease XPG. The structure of the N-terminal region demonstrates the pleckstrin homology (PH) fold.