Abstract
THE import of nuclear proteins proceeds through the nuclear pore complex and requires nuclear localization signals (NLSs)1,2, energy3,4 and soluble factors5, namely importin-α(Mr 60K)6-12,28, importin-β (90K)8-11,13 and Ran14,15. Importin-α is primarily responsible for NLS recognition6-12,29 and is a member of a protein family that includes the essential yeast nuclear pore protein SRPlp (ref. 16). As the first event, the complex of importin-α and importin-β binds the import substrate in the cytosol8,9. Here we show that this nuclear pore targeting complex initially docks as a single entity to the nuclear pore via importin-β. Then the energy-dependent, Ran-mediated translocation through the pore results in the accumulation of import substrate and importin-α in the nucleus. In contrast, importin-β accumulates at the nuclear envelope, but not in the nucleoplasm. Immunoelectron microscopy detects importin-β on both sides of the nuclear pore. This suggests that the nuclear pore targeting complex might move as a single entity from its initial docking site through the central part of the nuclear pore before it disassembles on the nucleoplasmic side.
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References
Dingwall, C., Sharnick, S. V. & Laskey, R. A. Cell 30, 449–458 (1982).
Kalderon, D., Roberts, B. L., Richardson, W. D. & Smith, A. E. Cell 39, 499–509 (1984).
Newmeyer, D. D. & Forbes, D. J. Cell 52, 641–653 (1988).
Richardson, W. D., Mills, A. D., Dilworth, S. M., Laskey, R. A. & Dingwall, C. Cell 52, 655–664 (1988).
Adam, S. A., Sterne-Marr, R. & Gerace, L. J. Cell Biol. 111, 807–816 (1990).
Adam, S. A. & Gerace, L. Cell 66, 837–847 (1991).
Görlich, D., Prehn, S., Laskey, R. A. & Hartmann, E. Cell 79, 767–778 (1994).
Görlich, D. et al. Curr. Biol. 5, 383–392 (1995).
Imamoto, N., Tachibana, T., Matsubae, M. & Yoneda, Y. J. biol. Chem. 270, 8559–8565 (1995).
Moroianu, J., Blobel, G. & Radu, A. Proc. natn. Acad. Sci. U.S.A. 92, 2008–2011 (1995).
Radu, A., Blobel, G. & Moore, M. S. Proc. natn. Acad. Sci. U.S.A. 92, 1769–1773 (1995).
Weis, K., Mattaj, I. W. & Lamond, A. I. Science 268, 1049–1051 (1995).
Chi, N. C., Adam, E. J. H. & Adam, S. A. J. Cell Biol. 130, 265–274 (1995).
Moore, M. S. & Blobel, G. Nature 365, 661–663 (1993).
Melchior, F., Paschal, B., Evans, J. & Gerace, L. J. Cell Biol. 123, 1649–1659 (1993).
Yano, R., Oakes, M., Yamaghishi, M., Dodd, J. A. & Nomura, M. Molec. cell. Biol. 12, 5640–5651 (1992).
Moore, M. S. & Biobel, G. Proc. natn. Acad. Sci. U.S.A. 91, 10212–10216 (1994).
Paschal, B. M. & Gerace, L. J. Cell Biol. 129, 925–937 (1995).
Adam, S. A., Lobl, T. J., Mitchell, M. A. & Gerace, L. Nature 337, 276–279 (1989).
Bischoff, F. R. & Ponstingl, H. Proc. natn. Acad. Sci. U.S.A. 88, 10830–10834 (1991).
Ren, M. D., Drivas, G., Deustachio, P. & Rush, M. G. J. Cell Biol. 120, 313–323 (1993).
Moroianu, J. & Blobel, G. Proc. natn. Acad. Sci. U.S.A. 92, 4318–4322 (1995).
Schmidt-Zachmann, M. S., Dargemont, C., Kuhn, L. C. & Nigg, E. A. Cell 74, 493–504 (1993).
Azuma, Y., Tabb, M. M., Vu, L. & Nomura, M. Proc. natn. Acad. Sci. U.S.A. 5159–5163 (1995).
Harlow, E. & Lane, D. Antibodies: A Laboratory Manual (Cold Spring Harbor Laboratory, New York, 1988).
Tokuyasu, K. Histochem. J. 21, 163–171 (1989).
Griffiths, G. in Fine Structure Immunocytochemistry 137–203 (Springer, Berlin, 1993).
Imamoto, N. et al. EMBO J. 14, 36717–36726 (1995).
Moroianu, J., Hijikata, M., Blobel, G. & Radu, A. Proc. natn. Acad. Sci. U.S.A. 92, 6532–6536 (1995).
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Görlich, D., Vogel, F., Mills, A. et al. Distinct functions for the two importin subunits in nuclear protein import. Nature 377, 246–248 (1995). https://doi.org/10.1038/377246a0
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DOI: https://doi.org/10.1038/377246a0
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