Transcription factor that regulates the expression of the gene cluster that mediates the biosynthesis of bikaverin, a red pigment also considered as a mycotoxin (PubMed:19400779). Expression is repressed by glutamine and at alkaline ambient pH and highly induced under nitrogen starvation and acidic pH conditions (PubMed:19400779). Leads to decreased production of bikaverin (PubMed:19400779).