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The yeast Ras-like small GTPases Gtr1p and Gtr2p form a heterodimer and interact genetically with Prp20p, a guanine nucleotide exchange factor for the GTPase Gsp1p. Gtr1p and Gtr2p may be involved in nucleocytoplasmic transport and in the nutrient-responsive TOR signaling pathway, but the role of the Gtr1p–Gtr2p heterodimer is not well understood. Characterization of the Gtr1p–Gtr2p complex is indispensable...
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