Transcription coactivator involved in regulation of the dothistromin biosynthesis gene cluster with aflR (PubMed:25986547). Expression is 8-fold up regulated when aflR is deleted (PubMed:23207690). Strongly reduces the expression of dothistromin biosynthesis genes such as hexA, hexB, pksA, adhA, vbsA, dotB, ver1 and dotB, and the subsequent production of dothistromin (PubMed:25986547).