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© The Rockefeller University Press, 0021-9525/1998//863 $5.00
The Journal of Cell Biology, Volume 141, Number 4, , 1998 863-874

Articles

Nucleocytoplasmic Shuttling Factors Including Ran and CRM1 Mediate Nuclear Export of NFAT In Vitro



Ralph H. Kehlenbach, Achim Dickmanns, and Larry Gerace

Department of Cell Biology and Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037

We have developed a permeabilized cell assay to study the nuclear export of the shuttling transcription factor NFAT, which contains a leucine-rich export signal. The assay uses HeLa cells that are stably transfected with NFAT fused to the green fluorescent protein (GFP). Nuclear export of GFP–NFAT in digitonin-permeabilized cells occurs in a temperature- and ATP-dependent manner and can be quantified by flow cytometry. In vitro NFAT export requires the GTPase Ran, which is released from cells during the digitonin permeabilization. At least one additional rate-limiting export factor is depleted from permeabilized cells by a preincubation at 30°C in the absence of cytosol. This activity can be provided by cytosolic or nucleoplasmic extracts in a subsequent export step. Using this assay, we have purified a second major export activity from cytosol. We found that it corresponds to CRM1, a protein recently reported to be a receptor for certain leucine-rich export sequences. CRM1 appears to be imported into the nucleus by a Ran-dependent mechanism that is distinct from conventional signaling pathways. Considered together, our studies directly demonstrate by fractionation and reconstitution that nuclear export of NFAT is mediated by multiple nucleocytoplasmic shuttling factors, including Ran and CRM1.

Abbreviations used in this paper: FACS®, fluorescence activated cell sort(er)ing; GFP, green fluorescent protein; GSK-3, glycogen synthase kinase-3; NES, nuclear export sequence; NFAT, nuclear factor of activated T cells; NLS, nuclear localization sequence; NPC, nuclear pore complex; WGA, wheat germ agglutinin.

Address all correspondence to Larry Gerace, Department of Cell Biology and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037. Tel.: (619) 784-8514. Fax: (619) 784-9132. E-mail: lgerace{at}scripps.edu


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