Transcription factor that regulates the expression the gene cluster that mediates the biosynthesis of fumonisins B1 (FB1), B2 (FB2), B3 (FB3), and B4 (FB4), which are carcinogenic mycotoxins (PubMed:17483290). Expression is controlled by the global regulators for secondary metabolite VE1 and LAE1 (PubMed:19382792, PubMed:22713715). Expression is increased under histone deacetylase (HDAC)-inhibiting conditions (PubMed:22117026). Impairs the production of fumonisins (PubMed:17483290).