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| Content Provider | PubMed Central |
|---|---|
| Author | Kenna, M. A. Petranka, J. G. Reilly, J. L. Davis, L. I. |
| Abstract | The FG nucleoporins are a conserved family of proteins, some of which bind to the nuclear localization sequence receptor, karyopherin. Distinct members of this family are found in each region of the nuclear pore complex (NPC), spanning from the cytoplasmically disposed filaments to the distal end of the nuclear basket. Movement of karyopherin from one FG nucleoporin to the next may be required for translocation of substrates across the NPC. So far, nothing is known about how the FG nucleoporins are localized within the NPC. To identify proteins that interact functionally with one member of this family, the Saccharomyces cerevisiae protein Nup1p, we previously identified 16 complementation groups containing mutants that are lethal in the absence of NUP1 These mutants were referred to as nle (Nup-lethal) mutants. Mutants in the nle3/nlel7 complementation group are lethal in combination with amino-terminal nup1 truncation mutants, which we have previously shown to be defective for localization to the NPC. Here we show that NLE3 (which is allelic to NUP170) encodes a protein with similarity to the mammalian nucleoporin Nup155. We show that Nle3p coprecipitates with glutathione S-transferase fusions containing the amino-terminal domain of Nup1p. Furthermore, a deletion of Nle3p leads to changes in the stoichiometry of several of the XFXFG nucleoporins, including the loss of Nup1p and Nup2p. These results suggest that Nle3p plays a role in localizing specific FG nucleoporins within the NPC. The broad spectrum of synthetic phenotypes observed with the nle3delta mutant provides support for this model. We also identify a redundant yeast homolog that can partially substitute for Nle3p and show that together these proteins are required for viability. |
| Starting Page | 2025 |
| File Format | |
| ISSN | 10985549 |
| e-ISSN | 10985549 |
| Journal | Molecular and Cellular Biology |
| Issue Number | 5 |
| Volume Number | 16 |
| Language | English |
| Publisher Date | 1996-05-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology |
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