Transcription factor that coregulates 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). Specifically positively regulates the expression of the FAD-dependent oxidoreductase dbaF (PubMed:23001671). 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 positively regulated by the dba cluster specific transcription factor dbaA (PubMed:23001671). Expression is also controlled by the transcription factor flbB (PubMed:25701285). Reduces the amounts of DHMBA produced and strongly reduces the production of yellow pigmentation.