Transcription factor that regulates the expression of the gene cluster that mediates the biosynthesis of the antibiotic 2,4- dihydroxy-3-methyl-6-(2-oxopropyl)benzaldehyde (DHMBA) and its derivatives (PubMed:23001671). Probably binds the conserved motif 5'-CT/CCG/AGA/CG/CT/A/CA/TT/A/GC-3' found in all dba cluster promoters and that shows significant similarities to the binding sites of other fungal C6 finger domain transcription factors (Probable). Deletion of the conserved eukaryotic csnE deneddylase subunit of the COP9 signalosome leading to defect in protein degradation results in the activation of the silenced dba gene cluster (PubMed:23001671). Expression is controlled by the transcription factor flbB (PubMed:25701285).