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| Item Type: | Article |
|---|---|
| Title: | Identification of importin alpha 7 specific transport cargoes using a proteomic screening approach |
| Creators Name: | Hügel, S. and Depping, R. and Dittmar, G. and Rother, F. and Cabot, R. and Sury, M.D. and Hartmann, E. and Bader, M. |
| Abstract: | The importin alpha:beta complex is responsible for the nuclear import of proteins bearing classical nuclear localization signals. In mammals several importin alpha subtypes are known to exist which are suggested to have individual functions. Importin alpha 7 was shown to play a crucial role in early embryo development in mice. Embryos from importin alpha 7 depleted females stop at the two-cell stage and show disturbed zygotic genome activation. Since there is evidence that individual importin alpha subtypes possess cargo specificities, we hypothesized that importin alpha 7 binds a unique set of intracellular proteins. By using a collection of in vitro and in vivo binding assays, importin alpha 7 interaction partners were identified that differed from proteins found to bind to importin alpha 2 and 3. One of the proteins preferentially binding importin alpha 7 was the maternal effect protein Brg1. However, Brg1 was localized in oocyte nuclei in importin alpha 7 deficient embryos, albeit in reduced amounts, suggesting additional modes of nuclear translocation of this factor. An additional SILAC based screening approach identified Ash2l, Chd3, Mcm3, and Smarcc1 whose nuclear import seems to be disturbed in importin alpha 7 deficient fibroblasts. |
| Keywords: | Importin alpha, Karyopherin alpha, Nucleocytoplasmic Transport, Brg1, smarca4, Baf190a, Ash2l, Chd3, Mcm3, Mcm5, Smarcc1, Binding Partners, Animals, Mice |
| Source: | Molecular & Cellular Proteomics |
| ISSN: | 1535-9476 |
| Publisher: | American Society for Biochemistry and Molecular Biology |
| Volume: | 13 |
| Number: | 5 |
| Page Range: | 1286-1298 |
| Date: | 1 May 2014 |
| Official Publication: | https://doi.org/10.1074/mcp.M112.026856 |
| PubMed: | View item in PubMed |
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