Transcription factor that regulates gliotoxin production and contributes to virulence (PubMed:15979823, PubMed:17030582, PubMed:20548963, PubMed:21612254). Expression is induced by gliotoxin (PubMed:20548963). Expression is controled by veA (PubMed:23087369). Expression is controled by brlA and abaA (PubMed:26032501). Expression is also regulated by rsmA (PubMed:23671611). Expression is also influenced by SfaD and GpgA (PubMed:19915845). Impairs the expression of the majority of genes in the gliotoxin cluster with the exception of gliT (PubMed:17030582, PubMed:20548963, PubMed:21612254). Truncated N-terminus.