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| Title | The small GTPase Ran defines nuclear pore complex asymmetry. |
|---|---|
| Journal, issue, pages | Cell, Vol. 188, Issue 21, Page 5931-5946.e16, Year 2025 |
| Publish date | Oct 16, 2025 |
Authors | Jenny Sachweh / Mandy Börmel / Sven Klumpe / Anja Becker / Reiya Taniguchi / Marta Anna Kubańska / Verena Pintschovius / Eva Kaindl / Jürgen M Plitzko / Florian Wilfling / Martin Beck / Bernhard Hampoelz / ![]() |
| PubMed Abstract | Nuclear pore complexes (NPCs) bridge across the nuclear envelope and mediate nucleocytoplasmic exchange. They consist of hundreds of nucleoporin building blocks and exemplify the structural ...Nuclear pore complexes (NPCs) bridge across the nuclear envelope and mediate nucleocytoplasmic exchange. They consist of hundreds of nucleoporin building blocks and exemplify the structural complexity of macromolecular assemblies. To ensure transport directionality, different nucleoporin complexes are attached to the cytoplasmic and nuclear face of the NPC. How those asymmetric structures are faithfully assembled onto the symmetric scaffold architecture that exposes the same interaction surfaces to either side remained enigmatic. Here, we combine cryo-electron tomography, subtomogram averaging, and template matching with live imaging to address this question in budding yeast and Drosophila. We genetically induce ectopic nuclear pores and show that pores outside the nuclear envelope are symmetric. We furthermore demonstrate that the peripheral NPC configuration is affected by the nucleotide state of the small GTPase Ran. Our findings indicate that the nuclear transport system is self-regulatory, namely that the same molecular mechanism controls both transport and transport channel composition. |
External links | Cell / PubMed:40829587 |
| Methods | EM (subtomogram averaging) |
| Resolution | 31.1 - 69.0 Å |
| Structure data | ![]() EMDB-53721: Asymmetric unit of the NE-NPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53722: Cytoplasmic ring asymmetric unit of the NE-NPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53723: Inner ring asymmetric unit of the NE-NPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53724: Nuclear ring asymmetric unit of the NE-NPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53725: Asymmetric unit of the nNPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53727: Top nuclear ring asymmetric unit of the nNPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53728: Inner ring asymmetric unit of the nNPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53729: Bottom nuclear ring asymmetric unit of the nNPC in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells ![]() EMDB-53731: Nuclear pore complex in the nuclear envelope (NE-NPC) in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells, composite structure ![]() EMDB-53732: Nuclear pore complex in nucleoplasmic membranes (nNPC) in S. cerevisiae Not4 deletion Nup188::GFP Nup170::mars cells, composite structure ![]() EMDB-53739: Asymmetric unit of the NE-NPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53740: Cytoplasmic ring asymmetric unit of the NE-NPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53741: Inner ring asymmetric unit of the NE-NPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53742: Nuclear ring asymmetric unit of the NE-NPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53743: Nuclear basket asymmetric unit of the NE-NPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53744: Asymmetric unit of the cNPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53745: Top cytoplasmic ring asymmetric unit of the cNPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53746: Inner ring asymmetric unit of the cNPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53747: Bottom cytoplasmic ring asymmetric unit of the cNPC in D. melanogaster Nup358::VN/Nup358::VC cells ![]() EMDB-53750: Nuclear pore complex in the nuclear envelope (NE-NPC) in D. melanogaster Nup358::VN/Nup358::VC cells, composite structure ![]() EMDB-53751: Nuclear pore complex in cytoplasmic membranes (cNPC) in D. melanogaster Nup358::VN/Nup358::VC cells, composite structure |
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