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Updated: Aug 7, 2026

Single-Molecule Imaging of Nuclear Transport
Published on: June 10, 2010
Translocation through the nuclear pore complex: selectivity and speed by reduction-of-dimensionality
1Institute of Medical Physics and Biophysics and Center of Nanotechnology (CeNTech), University of Muenster, Robert-Koch-Strasse 31, 48149 Muenster, Germany. petersr@uni-muenster.de
Nuclear transport receptors act as nanoscopic ferries, sliding along phenylalanine glycine (FG) motifs within the nuclear pore complex (NPC). This model explains how binding enhances passive cargo transport through the NPC.
Area of Science:
- Cell Biology
- Biophysics
Background:
- Nuclear pore complex (NPC) facilitates transport between the nucleus and cytoplasm.
- Translocation is passive and diffusion-driven, yet enhanced by binding, posing a transport paradox.
Purpose of the Study:
- To propose a novel model for nuclear transport receptors (NTRs) mediated translocation through the NPC.
- To explain the paradox of binding enhancing passive transport.
Main Methods:
- A conceptual model based on recent experimental findings.
- Postulating NTRs as nanoscopic ferries utilizing a 2D random walk on FG motifs.
Main Results:
- NTRs, like karyopherins, slide on a coherent FG motif surface within the NPC.
- This mechanism explains enhanced transport and features virtual gating.
- The model is independent of FG affinity gradients and tolerates FG motif variations.
Conclusions:
- The proposed nanoscopic ferry model provides a new perspective on NPC transport.
- It reconciles passive diffusion with binding-enhanced translocation.
- Further experimental tests are suggested to validate the model.
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