Transcription factor that regulates the expression of the gene cluster that mediates the biosynthesis of the mycotoxin citrinin, a hepato-nephrotoxic compound to humans due to inhibition of respiration complex III (PubMed:17586673, PubMed:19111642). Leads to a large decrease in the transcription of pksCT and ctnC, together with reduction of citrinin production to barely detectable level (PubMed:17586673).