Transcription factor that regulates the expression of the gene cluster that mediates the biosynthesis of ustiloxin B, an antimitotic tetrapeptide (PubMed:24841822, PubMed:26703898). Impairs the production of ustiloxin B and its intermediate ustiloxin F (PubMed:24841822, PubMed:26703898). The predicted genes AFLA_095080 and AFLA_095090 have been merged into 1 gene: ustR. The predicted genes AFLA_095080 and AFLA_095090 have been merged into 1 gene: ustR.