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. 1994 Jul 19;91(15):7179–7183. doi: 10.1073/pnas.91.15.7179

Nuclear localization signals also mediate the outward movement of proteins from the nucleus.

A Guiochon-Mantel 1, K Delabre 1, P Lescop 1, E Milgrom 1
PMCID: PMC44362  PMID: 8041765

Abstract

Several nuclear proteins, including steroid hormone receptors, have been shown to shuttle continuously between the nucleus and the cytoplasm. The mechanism of entry of proteins into the nucleus is well documented, whereas the mechanism of their outward movement into the cytoplasm is not understood. We have grafted the nuclear localization signals of the progesterone receptor or the simian virus 40 large tumor antigen onto beta-galactosidase. These additions were shown to impart to the protein the ability to shuttle between the nucleus and the cytoplasm. Microinjected proteins devoid of a nuclear localization signal were unable to exit from the nucleus. The same nuclear localization signals are thus involved in both the inward and the outward movement of proteins through the nuclear membrane. We also show that although the nuclear import requires energy, the nuclear export does not. These results suggest that the nucleocytoplasmic shuttling may be a general phenomenon for nuclear proteins that could possibly undergo modifications in the cytoplasm and exert some biological activities there. These conclusions also imply that at least part of the cellular machinery involved in the nuclear import of proteins may function bidirectionally.

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