Transcription factor; part of the gene cluster that mediates the biosynthesis of 11'-deoxyverticillin A, one of the dimeric epipolythiodioxopiperazines (ETPs) from the verticillin family that act as mycotoxins (PubMed:28376389, PubMed:29058652). 11'-deoxyverticillin A is required for normal conidiation (PubMed:28376389). Directly binds the consensus motif 5'-(T/C)(C/A)(G/T)GN3CC(G/T)(A/G)(G/C)-3' localized in the upstream regions of the verticillin biosynthetic genes (PubMed:29058652). Significantly decreases 11'-deoxyverticillin A production.