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Related Experiment Videos

The strategy for coupling the RanGTP gradient to nuclear protein export.

Attila Becskei1, Iain W Mattaj

  • 1Gene Expression Programme, European Molecular Biology Laboratory, D-69117 Heidelberg, Germany.

Proceedings of the National Academy of Sciences of the United States of America
|February 4, 2003
PubMed
Summary

Nuclear protein export relies on the Ran GTPase. Researchers found that export signals enable cargo movement into the nucleus, supporting a diffusional mechanism for nuclear transport.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biophysics

Background:

  • The Ran GTPase is essential for nucleocytoplasmic transport, providing energy and directionality.
  • The mechanism coupling the RanGTP gradient to nuclear protein export is currently unknown.
  • Understanding this coupling mechanism is crucial for determining the limits of cytoplasmic cargo accumulation.

Purpose of the Study:

  • To investigate the mechanism coupling the RanGTP gradient to nuclear protein export.
  • To distinguish between plausible coupling mechanisms by comparing experimental data with mathematical models.
  • To determine the rates of reverse motion of export cargoes through the nuclear pore complex (NPC).

Main Methods:

  • Utilized Xenopus oocytes for experimental measurements.

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  • Measured the rates of reverse motion of export cargoes through the NPC.
  • Employed a mathematical model for comparison with experimental rates.
  • Analyzed the relationship between cargo-receptor affinity and transport rates.

    • Main Results:

    • Nuclear export signals facilitate RanGTP-dependent cargo movement into the nucleus against the RanGTP gradient.
    • Reverse export rates were comparable to forward export rates.
    • Cargoes with higher affinity for their receptor were exported faster and exhibited greater reverse transport.
    • The ratio of reverse to forward export rates correlated with cargo diffusion rates through the NPC.

    Conclusions:

    • The study substantiates a diffusional mechanism for coupling the RanGTP gradient to nuclear protein export.
    • Evidence suggests a high concentration of RanGTP-receptor complexes within the NPC.
    • A sharp decrease in RanGTP-receptor complexes at the NPC's cytoplasmic boundary is indicated.