This domain is found in a family of actinobacterial transcription factors. The structure shows it has a PAS domain like fold and it is bound to Myristic acid [1].

1: Structure of an MmyB-like regulator from C. aurantiacus, member of a new transcription factor family linked to antibiotic metabolism in actinomycetes. Xu Q, van Wezel GP, Chiu HJ, Jaroszewski L, Klock HE, Knuth MW, Miller MD, Lesley SA, Godzik A, Elsliger MA, Deacon AM, Wilson IA; PLoS One. 2012;7:e41359. PMID:22844465