This domain is found in Transcription factor tau 138 kDa subunit from Saccharomyces cerevisiae (TFC3), which may play a role in linking tauA, tauB, and TFIIIB to regulate the formation of the RNA polymerase III pre-initiation complex. This entry represents its extended winged helix (eWH) domain, which is centrally located [1,2].

1: Architecture of TFIIIC and its role in RNA polymerase III pre-initiation complex assembly. Male G, von Appen A, Glatt S, Taylor NM, Cristovao M, Groetsch H, Beck M, Muller CW; Nat Commun. 2015;6:7387. PMID:26060179

2: Construction of novel repeat proteins with rigid and predictable structures using a shared helix method. Youn SJ, Kwon NY, Lee JH, Kim JH, Choi J, Lee H, Lee JO; Sci Rep. 2017;7:2595. PMID:28572639