Transcription factor; part of the gene cluster that mediates the biosynthesis of eupenifeldin, a bistropolone meroterpenoid that acts as an antitumor agent. Abolishes the production of eupenifeldin. Eupenifeldin is a bistropolone-humulene meroterpenoid first discovered as an antitumor and anti-leukemia agent (PubMed:8360103). This metabolite shows also anthelmintic activity against the parasitic worm Hemonchus contortus, anti-malarial activity as well as antifungal activity (PubMed:18095654, Ref.4). Truncated N-terminus.