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Published online 11 February 2002. doi:10.1083/jcb.200106046
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© The Rockefeller University Press, 0021-9525/2002/2/617 $5.00
The Journal of Cell Biology, Volume 156, Number 4, February 18, 2002 617-630

Article

Tpr is localized within the nuclear basket of the pore complex and has a role in nuclear protein export



Phyllis Frosst, Tinglu Guan, Cecilia Subauste, Klaus Hahn and Larry Gerace

Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037

Address correspondence to Larry Gerace, 10550 N. Torrey Pines Rd., Imm10, R209, La Jolla, CA 92037. Tel.: (858) 784-8514. Fax: (858) 784-9132. E-mail: lgerace{at}scripps.edu

Tpr is a coiled-coil protein found near the nucleoplasmic side of the pore complex. Since neither the precise localization of Tpr nor its functions are well defined, we generated antibodies to three regions of Tpr to clarify these issues. Using light and EM immunolocalization, we determined that mammalian Tpr is concentrated within the nuclear basket of the pore complex in a distribution similar to Nup153 and Nup98. Antibody localization together with imaging of GFP-Tpr in living cells revealed that Tpr is in discrete foci inside the nucleus similar to several other nucleoporins but is not present in intranuclear filamentous networks (Zimowska et al., 1997) or in long filaments extending from the pore complex (Cordes et al., 1997) as proposed. Injection of anti-Tpr antibodies into mitotic cells resulted in depletion of Tpr from the nuclear envelope without loss of other pore complex basket proteins. Whereas nuclear import mediated by a basic amino acid signal was unaffected, nuclear export mediated by a leucine-rich signal was retarded significantly. Nuclear injection of anti-Tpr antibodies in interphase cells similarly yielded inhibition of protein export but not import. These results indicate that Tpr is a nucleoporin of the nuclear basket with a role in nuclear protein export.

Key Words: nuclear basket; nuclear foci; nuclear filaments; nuclear transport; nuclear pore complex


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