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Structural basis for the nuclear protein import cycle.

M Stewart1

  • 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, UK. ms@mrc-lmb.cam.ac.uk

Biochemical Society Transactions
|October 21, 2006
PubMed
Summary
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Nuclear transport relies on importin-beta proteins that bind cargo and move through nuclear pore complexes (NPCs). Ran-GTP binding alters importin-beta

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Nuclear pore complexes (NPCs) regulate macromolecule transport between the nucleus and cytoplasm.
  • Importin-beta superfamily proteins act as soluble transport factors for nuclear import.
  • The import cycle involves cargo binding, NPC translocation, and cargo release mediated by Ran-GTP.

Purpose of the Study:

  • To elucidate the molecular mechanisms governing nuclear protein import.
  • To understand the structural dynamics of importin-beta and its interactions during transport.
  • To investigate the role of Ran-GTP in regulating importin-beta function.

Main Methods:

  • Crystallography to determine protein structures.
  • Biochemical assays to study protein interactions and function.

Related Experiment Videos

  • Cellular studies to validate findings in a biological context.
  • Protein engineering and computer modeling for mechanistic insights.

    • Main Results:

    • Importin-beta proteins are flexible and adapt their shape to bind cargo.
    • Ran-GTP binding induces a conformational change in importin-beta and CAS, inhibiting cargo binding.
    • Interactions with nucleoporins (e.g., Nup1p, Nup2p, Nup50) modulate complex formation and dissociation rates.

    Conclusions:

    • A detailed molecular model of the nuclear import cycle has been developed and validated.
    • The conformational flexibility of importin-beta is crucial for cargo recognition and transport.
    • Ran-GTP acts as a key regulator by altering importin-beta conformation and disrupting import complexes.