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Quick-freeze, deep-etch visualization of the nuclear pore complex.

Y Fujitani, S Higaki, H Sawada

    Journal of Electron Microscopy
    |January 1, 1989
    PubMed
    Summary
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    We visualized the nuclear pore complex (NPC) in 3D, revealing a structure of four rings and filaments. These filaments, potentially vimentin, interact with the NPC and nuclear membrane.

    Area of Science:

    • Cell Biology
    • Structural Biology
    • Biophysics

    Background:

    • The nuclear pore complex (NPC) regulates transport between the nucleus and cytoplasm.
    • Detailed structural information of the NPC is crucial for understanding its function.

    Purpose of the Study:

    • To visualize the three-dimensional structure of the nuclear pore complex (NPC).
    • To elucidate the composition and arrangement of NPC components, including rings and filaments.

    Main Methods:

    • Three-dimensional visualization using quick-freeze and deep-etching techniques.
    • Analysis of replica and thin-sectioned images for structural details.

    Main Results:

    • The NPC is composed of four distinct rings located at the cytoplasmic, nucleoplasmic, and pore waist regions.

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  • Associated filaments emanate towards the cytoplasm, spread over the cytoplasmic face of the nuclear membrane, and interconnect the rings.
  • Emanating filaments are identified as potential vimentin filaments based on imaging analysis.

    • Conclusions:

    • The study provides a detailed 3D structural model of the NPC.
    • The identified filament structures suggest a role in NPC organization and interaction with the nuclear envelope.
    • Vimentin filaments may be associated with the NPC structure.