ABC transporter; part of the gene cluster that mediates the biosynthesis of xenovulene A, an unusual meroterpenoid that has potent inhibitory effects on the human gamma-aminobutyrate A (GABAA) benzodiazepine receptor. Expression is significantly up-regulated under xenovulene A producing condition. Xenovulene A is a natural product exhibiting little structural resemblance with classical benzodiazepines yet is able to displace high-affinity ligand binding to the benzodiazepine site of the gamma-aminobutyrate A (GABAA) receptor and could be potentially used as an anti-depressant with reduced addictive properties. Belongs to the ABC transporter superfamily. ABCG family. PDR (TC 3.A.1.205) subfamily.