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Nuclear pore complex structure in birds

M W Goldberg1, I Solovei, T D Allen

  • 1Department of Structural Cell Biology, Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, United Kingdom.

Journal of Structural Biology
|August 1, 1997
PubMed
Summary
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Nuclear pore complexes (NPCs) are crucial for cell function. This study reveals that the NPC structure, including peripheral elements like the nucleoplasmic basket, is highly conserved across different species, even with variations in basket conformation.

Area of Science:

  • Cell Biology
  • Structural Biology
  • Molecular Biology

Background:

  • The nuclear envelope regulates molecular transport between the nucleus and cytoplasm.
  • Nuclear pore complexes (NPCs) are large protein structures embedded in the nuclear envelope.
  • Current NPC models primarily derive from amphibian oocyte studies, raising questions about broader applicability.

Purpose of the Study:

  • To investigate the structure of nuclear pore complexes in bird oocytes.
  • To compare avian NPC structure with existing models derived from amphibian oocytes.
  • To determine the conservation of novel peripheral NPC structures, such as the nucleoplasmic basket.

Main Methods:

  • Isolation of nuclear envelopes from bird oocytes.
  • High-resolution electron microscopy, including field emission in-lens scanning electron microscopy.

Related Experiment Videos

  • Comparative structural analysis of avian NPCs.

    • Main Results:

    • The overall structure of bird oocyte NPCs is remarkably conserved compared to amphibian models.
    • Novel peripheral structures, including the nucleoplasmic basket, show high similarity between avian and amphibian NPCs.
    • Observed variations in nucleoplasmic basket conformation are likely related to the functional states of individual NPCs.

    Conclusions:

    • The fundamental structure of nuclear pore complexes is evolutionarily conserved across different vertebrate classes.
    • Peripheral NPC structures, identified recently, are also conserved, suggesting a common functional role.
    • Variations in NPC structure, like basket conformation, may reflect dynamic functional states rather than fundamental structural differences.