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Utp8p is an essential nucleolar component of the nuclear tRNA export machinery in Saccharomyces cerevisiae. It is thought to act at a step between tRNA maturation/aminoacylation and translocation of the tRNA across the nuclear pore complex. To understand the function of Utp8p in nuclear tRNA export, a comprehensive affinity purification analysis was conducted to identify proteins that interact with Utp8p in vivo. In addition to finding proteins that have been shown previously to copurify with Utp8p, a number of new interactions were identified. These interactions include aminoacyl-tRNA synthetases, the RanGTPase Gsp1p, and nuclear tRNA export receptors such as Los1p and Msn5p. Characterization of the interaction of Utp8p with a subset of the newly identified proteins suggests that Utp8p most likely transfer tRNAs to the nuclear tRNA export receptors by using a channeling mechanism.

Utp8p Is a Nucleolar tRNA-binding Protein That Forms a Complex with Components of the Nuclear tRNA Export Machinery inSaccharomyces cerevisiae