Previous Article | Next Article 
Microbiology and Molecular Biology Reviews, December 2009, p. 577-593, Vol. 73, No. 4
1092-2172/09/$08.00+0 doi:10.1128/MMBR.00020-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.
ABC Transporters in Saccharomyces cerevisiae and Their Interactors: New Technology Advances the Biology of the ABCC (MRP) Subfamily
Christian M. Paumi,1,
Matthew Chuk,2
Jamie Snider,2
Igor Stagljar,2* and
Susan Michaelis1*
Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205,1 Terrence Donnelly Centre for Cellular and Biomolecular Research, Department of Biochemistry and Department of Molecular Genetics, University of Toronto, 160 College Street, Toronto, Ontario M5S 3E1, Canada2
Summary: Members of the ATP-binding cassette (ABC) transporter superfamily exist in bacteria, fungi, plants, and animals and play key roles in the efflux of xenobiotic compounds, physiological substrates, and toxic intracellular metabolites. Based on sequence relatedness, mammalian ABC proteins have been divided into seven subfamilies, ABC subfamily A (ABCA) to ABCG. This review focuses on recent advances in our understanding of ABC transporters in the model organism Saccharomyces cerevisiae. We propose a revised unified nomenclature for the six yeast ABC subfamilies to reflect the current mammalian designations ABCA to ABCG. In addition, we specifically review the well-studied yeast ABCC subfamily (formerly designated the MRP/CFTR subfamily), which includes six members (Ycf1p, Bpt1p, Ybt1p/Bat1p, Nft1p, Vmr1p, and Yor1p). We focus on Ycf1p, the best-characterized yeast ABCC transporter. Ycf1p is located in the vacuolar membrane in yeast and functions in a manner analogous to that of the human multidrug resistance-related protein (MRP1, also called ABCC1), mediating the transport of glutathione-conjugated toxic compounds. We review what is known about Ycf1p substrates, trafficking, processing, posttranslational modifications, regulation, and interactors. Finally, we discuss a powerful new yeast two-hybrid technology called integrated membrane yeast two-hybrid (iMYTH) technology, which was designed to identify interactors of membrane proteins. iMYTH technology has successfully identified novel interactors of Ycf1p and promises to be an invaluable tool in future efforts to comprehensively define the yeast ABC interactome.
* Corresponding author. Mailing address for Susan Michaelis: Department of Cell Biology, the Johns Hopkins School of Medicine, Baltimore, MD 21205. Phone: (410) 955-7274. Fax: (410) 955-4129. E-mail: michaelis{at}jhmi.edu. Mailing address for Igor Stagljar: Terrence Donnelly Centre for Cellular and Biomolecular Research, Department of Biochemistry and Department of Molecular Genetics, University of Toronto, 160 College Street, Toronto, Ontario M5S 3E1, Canada. Phone: (416) 946-7828. Fax: (416) 978-8287. E-mail: igor.stagljar{at}utoronto.ca
Present address: Graduate Center for Toxicology, University of Kentucky, Combs 212, 800 Rose St., Lexington, KY 40536.
Microbiology and Molecular Biology Reviews, December 2009, p. 577-593, Vol. 73, No. 4
1092-2172/09/$08.00+0 doi:10.1128/MMBR.00020-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.
Copyright © 2010 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»