General transcription factor TFIIE consists of two subunits, TFIIE alpha Pfam:PF02002 and TFIIE beta. TFIIE beta has been found to bind to the region where the promoter starts to open to be single-stranded upon transcription initiation by RNA polymerase II. The structure of the DNA binding core region has been solved [1] and has a winged helix fold.

1: Structure of the central core domain of TFIIEbeta with a novel double-stranded DNA-binding surface. Okuda M, Watanabe Y, Okamura H, Hanaoka F, Ohkuma Y, Nishimura Y; EMBO J 2000;19:1346-1356. PMID:10716934