Transcription factor that mediates regulation of both acid- and alkaline-expressed genes in response to ambient pH. At alkaline ambient pH, activates transcription of alkaline-expressed genes (including RIM101 itself) and represses transcription of acid-expressed genes. Specifically recognizes and binds the consensus sequence 5'-CCAAGAA-3'. Required for the control of alkaline pH-induced filamentation (dimorphic switch) and virulence