Mapping protein-protein interactions for the yeast ABC transporter Ycf1p by integrated split-ubiquitin membrane yeast two-hybrid analysis |
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Authors: | Paumi Christian M Menendez Javier Arnoldo Anthony Engels Kim Iyer Kavitha Ravee Thaminy Safia Georgiev Oleg Barral Yves Michaelis Susan Stagljar Igor |
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Affiliation: | Department of Cell Biology, The Johns Hopkins School of Medicine, Baltimore, MD 21205, USA. |
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Abstract: | The ATP binding cassette (ABC) transporters are important in human health and disease and represent the largest family of transmembrane proteins; however, their highly hydrophobic nature complicates the use of standard biochemical approaches to identify interacting proteins. Here, we report the development of a modified version of the split-ubiquitin membrane yeast two-hybrid (MYTH) technology using genomically integrated "bait" constructs, hence the designation iMYTH. We used iMYTH in a library-screening format and identified six potential interacting partners of the yeast ABC transporter Ycf1p. Strains deleted for several of these genes result in arsenite sensitivity similar to a Deltaycf1 strain. Transport assays show that one of these, Tus1p, a guanine nucleotide exchange factor (GEF) for the small GTPase Rho1p, is a Rho1p-dependent-positive regulator of Ycf1p. Our study provides proof of principle that iMYTH is an ideal methodology to identify physiological interactors and regulators of ABC transporters and other yeast transmembrane proteins. |
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