Transcription factor that positively controls filamentous growth, virulence, and invasiveness. Binds directly to the two SRE-1-like elements upstream of TEC1 and thus regulates positively expression of this important hyphal growth regulator. Functions independently of known signaling cascades involving EFG1. Regulates also gene expression during intestinal colonization but is not involved in host cell adhesion. Up-regulated during the yeast-to-hypha transition and in virulent strains during intestinal colonization. Also induced upon exposure to fluconazole. Expression is down-regulated by tetrandrine and by Escherichia coli biofilm secretory products. Impairs expression of hypha-specific transcripts and leads to a medium-specific impairment in hyphal development.