Pdr5p, the major multidrug exporter inSaccharomyces cerevisiae, is a member of the ATP-binding cassette (ABC) superfamily. Pdr5p shares similar mechanisms of substrate recognition and transport with the human MDR1-Pgp, despite an inverted topology of transmembrane and ATP-binding domains. The hexahistidine-tagged Pdr5p multidrug transporter was highly overexpressed in yeast strains where other ABC genes have been deleted. After solubilization and purification, the 160-kDa recombinant Pdr5p has been reconstituted into a lipid bilayer. Controlled detergent removal from Pdr5p-lipid-detergent micelles allowed the production of peculiar square-shaped particles coexisting with liposomes and proteoliposomes. These particles having 11 nm in side were well suited for single particle analysis by electron microscopy. From such analysis, a computed volume has been determined at 25-Å resolution, giving insight into the structural organization of Pdr5p. Comparison with the reported structures of different bacterial ABC transporters was consistent with a dimeric organization of Pdr5p in the square particles. Each monomer was composed of three subregions corresponding to a membrane region of about 50 Å in height that joins two well separated protruding stalks of about 40 Å in height, ending each one with a cytoplasmic nucleotide-binding domain (NBD) lobe of about 50–60 Å in diameter. The three-dimensional reconstruction of Pdr5p revealed a close arrangement and a structural asymmetric organization of the two NBDs that appeared oriented perpendicularly within a monomer. The existence of different angular positions of the NBDs, with respect to the stalks, suggest rotational movements during the catalytic cycle.
Three-dimensional Reconstruction of the Saccharomyces cerevisiae Multidrug Resistance Protein Pdr5p*
A. Ferreira-Pereira,S. Marco,A. Decottignies,J. Nader,A. Goffeau,J. Rigaud
Published 2003 in Journal of Biological Chemistry
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- Publication year
2003
- Venue
Journal of Biological Chemistry
- Publication date
2003-04-04
- Fields of study
Biology, Medicine
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Semantic Scholar, PubMed
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