Transcription factor that binds ribosomal protein gene promoters and rDNA locus with TBF1. Necessary for the expression of genes involved in assimilation of inorganic sulfate. Also required for the expression of respiratory genes and glycolytic genes. Does not bind to centromeres and is not necessary for efficient chromosome segregationas as does S.cerevisiae CBF1. Repressed during biofilm formation. Leads to auxotrophy for sulfur amino acids.