This domain is found at the N-terminus of ABC-transporter proteins from fungi, plants to higher eukaryotes. It is predicted to be an intracellular domain [1, 2, 3].

1: PDR5, a novel yeast multidrug resistance conferring transporter controlled by the transcription regulator PDR1. Balzi E, Wang M, Leterme S, Van Dyck L, Goffeau A; J Biol Chem. 1994;269:2206-2214. PMID:8294477

2: Molecular cloning and expression in Saccharomyces cerevisiae of a laccase gene from the ascomycete Melanocarpus albomyces. Kiiskinen LL, Saloheimo M; Appl Environ Microbiol. 2004;70:137-144. PMID:14711635

3: Toward understanding the mechanism of action of the yeast multidrug resistance transporter Pdr5p: a molecular modeling study. Rutledge RM, Esser L, Ma J, Xia D; J Struct Biol. 2011;173:333-344. PMID:21034832