Journal
JOURNAL OF CELL SCIENCE
Volume 122, Issue 8, Pages 1100-1110Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.040154
Keywords
Nup358; Transportin; Nuclear import; HIV-1 Rev; Nuclear pore complex
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Funding
- DFG [KE 660/5-1]
- Free and Hanseatic City of Hamburg
- Federal Ministry of Health
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Nup358 (also known as RanBP2), a component of the cytoplasmic filaments of the nuclear pore complex, has been implicated in various nucleocytoplasmic transport pathways. Here, we identify Nup358 as an important factor for transportin-mediated nuclear import. Depletion of Nup358 resulted in a strong inhibition of nuclear import of the human immunodeficiency virus type 1 (HIV-1) Rev protein. HIV-1 Rev is an RNA-binding protein that is required for CRM1 ( also known as exportin 1)-dependent nuclear export of unspliced or partially spliced viral RNA. We show that transportin is the major nuclear import receptor for HIV-1 Rev in HeLa cells. Overexpression of transportin strongly promoted nuclear import of HIV-1 Rev in Nup358-depleted cells, indicating that the import receptor becomes rate-limiting under these conditions. Importantly, the import rate of other transportin-dependent proteins was also significantly reduced in Nup358-depleted cells. Our data therefore suggest a general role for Nup358 in transportin-mediated nuclear import.
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