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Vol. 12, Issue 5, 1381-1392, May 2001

Role of Nuclear Pools of Aminoacyl-tRNA Synthetases in tRNA Nuclear Export

Abul K. Azad,* David R. Stanford, Srimonti Sarkar,dagger and Anita K. HopperDagger

Department of Biochemistry and Molecular Biology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033

Reports of nuclear tRNA aminoacylation and its role in tRNA nuclear export (Lund and Dahlberg, 1998; Sarkar et al., 1999; Grosshans et al., 2000a) have led to the prediction that there should be nuclear pools of aminoacyl-tRNA synthetases. We report that in budding yeast there are nuclear pools of tyrosyl-tRNA synthetase, Tys1p. By sequence alignments we predicted a Tys1p nuclear localization sequence and showed it to be sufficient for nuclear location of a passenger protein. Mutations of this nuclear localization sequence in endogenous Tys1p reduce nuclear Tys1p pools, indicating that the motif is also important for nucleus location. The mutations do not significantly affect catalytic activity, but they do cause defects in export of tRNAs to the cytosol. Despite export defects, the cells are viable, indicating that nuclear tRNA aminoacylation is not required for all tRNA nuclear export paths. Because the tRNA nuclear exportin, Los1p, is also unessential, we tested whether tRNA aminoacylation and Los1p operate in alternative tRNA nuclear export paths. No genetic interactions between aminoacyl-tRNA synthetases and Los1p were detected, indicating that tRNA nuclear aminoacylation and Los1p operate in the same export pathway or there are more than two pathways for tRNA nuclear export.

Present addresses: *Sir William Dunn School of Pathology, University of Oxford, South Parks Road, OX1 3RE, Oxford, United Kingdom; dagger Department of Cellular and Molecular Medicine, Howard Hughes Medical Institution, University of California, San Diego, School of Medicine, La Jolla, California 9209.

Dagger Corresponding author. E-mail address: ahopper{at}psu.edu

Molecular Biology of the Cell
Vol. 12, 1381-1392, May 2001
Copyright © 2001 by The American Society for Cell Biology


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