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Single-Molecule Imaging of Nuclear Transport
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A simple kinetic model with explicit predictions for nuclear transport.

Sanghyun Kim1, M Elbaum

  • 1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel.

Biophysical Journal
|August 13, 2013
PubMed
Summary

Nuclear transport relies on nuclear pores and receptor proteins. This study models this process, finding that receptor binding, not pore permeability, often limits molecular exchange between the nucleus and cytoplasm.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Nuclear pores facilitate molecular exchange between the nucleus and cytoplasm.
  • This transport involves both passive diffusion and receptor-mediated processes.
  • The small GTPase Ran regulates a major class of receptor-mediated transport, acting as a molecular pump.

Purpose of the Study:

  • To develop a simple analytical model for nucleo-cytoplasmic transport.
  • To investigate the kinetics of transport, including translocation and receptor binding.
  • To determine rate-limiting steps in nuclear transport under realistic cellular conditions.

Main Methods:

  • Development of a simple analytical model for molecular transport.
  • Inclusion of translocation and receptor binding kinetics in the model.
  • Application of the model to steady-state kinetics, such as fluorescence recovery after photobleaching.

Main Results:

  • Model time constants are combinations of parameters, making individual effects inseparable.
  • Competitive cargo binding and cytoplasmic volume buffer transport properties.
  • Under realistic conditions, receptor binding, not nuclear pore permeability, is often rate-limiting for nucleo-cytoplasmic exchange.

Conclusions:

  • Receptor binding kinetics play a critical role in regulating nucleo-cytoplasmic transport.
  • The model provides insights into the cellular context of nuclear transport.
  • Understanding these limitations is crucial for comprehending eukaryotic cell function.