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Nuclear transport of human immunodeficiency virus type 1, visna virus, and equine infectious anemia virus Rev proteins: identification of a family of transferable nuclear export signals.

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  • 1. Howard Hughes Medical Institute, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6148, USA.
      Authors
    • Meyer BE 1
    (1 author)

Journal of Virology, 01 Apr 1996, 70(4):2350-2359
https://doi.org/10.1128/jvi.70.4.2350-2359.1996 PMID: 8642662 PMCID: PMC190077

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Abstract 

The human immunodeficiency virus type 1 Rev trans activator binds directly to unspliced viral mRNA in the nucleus and activates its transport to the cytoplasm. In additon to the sequences that confer RNA binding and nuclear localization, Rev has a carboxy-terminal region, the activation domain, whose integrity is essential for biological activity. Because it has been established that Rev constitutively exits and reenters the nucleus and that the activation domain is required for nuclear exit, it has been proposed that Rev's activation domain is a nuclear export signal (NES). Here, we used microinjection-based assays to demonstrate that the activation domain of human immunodeficiency virus type 1 Rev imparts rapid nuclear export after its transfer to heterologous substrates. NES- mediated export is specific, as it is sensitive both to inactivation by missense mutation and to selective inhibition by an excess of the wild-type, but not mutant, activation domain peptide. Examination of the Rev trans activators of two nonprimate lentiviruses, visna virus and equine infectious anemia virus, revealed that their activation domains are also potent NESs. Taken together, these data demonstrate that nuclear export can be determined by positively acting peptide motifs, namely, NESs, and suggest that Rev proteins activate viral RNA transport by providing export ribonucleoproteins with specific information that targets them to the cytoplasm.

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J Virol. 1996 Apr; 70(4): 2350–2359.
PMCID: PMC190077
PMID: 8642662

Nuclear transport of human immunodeficiency virus type 1, visna virus, and equine infectious anemia virus Rev proteins: identification of a family of transferable nuclear export signals.

B E Meyer, J L Meinkoth, and M H Malim
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Abstract

The human immunodeficiency virus type 1 Rev trans activator binds directly to unspliced viral mRNA in the nucleus and activates its transport to the cytoplasm. In additon to the sequences that confer RNA binding and nuclear localization, Rev has a carboxy-terminal region, the activation domain, whose integrity is essential for biological activity. Because it has been established that Rev constitutively exits and reenters the nucleus and that the activation domain is required for nuclear exit, it has been proposed that Rev's activation domain is a nuclear export signal (NES). Here, we used microinjection-based assays to demonstrate that the activation domain of human immunodeficiency virus type 1 Rev imparts rapid nuclear export after its transfer to heterologous substrates. NES- mediated export is specific, as it is sensitive both to inactivation by missense mutation and to selective inhibition by an excess of the wild-type, but not mutant, activation domain peptide. Examination of the Rev trans activators of two nonprimate lentiviruses, visna virus and equine infectious anemia virus, revealed that their activation domains are also potent NESs. Taken together, these data demonstrate that nuclear export can be determined by positively acting peptide motifs, namely, NESs, and suggest that Rev proteins activate viral RNA transport by providing export ribonucleoproteins with specific information that targets them to the cytoplasm.

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Selected References

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