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Related Experiment Videos

Intranuclear membrane structure formations by CaaX-containing nuclear proteins.

Thorsten Ralle1, Christine Grund, Werner W Franke

  • 1Department of Cell Biology, University of Bremen, PO Box 33 04 40, 28334 Bremen, Germany.

Journal of Cell Science
|November 18, 2004
PubMed
Summary

Increased synthesis of lamins B1 and B2 in amphibian oocytes induces intranuclear membrane arrays. This membrane proliferation depends on CaaX-specific posttranslational modification, impacting protein synthesis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The nuclear lamina, a protein meshwork, lines the nuclear envelope.
  • Lamins associate with the inner nuclear membrane via C-terminal CaaX motif modifications.
  • B-type lamins are isoprenylated, while lamin A undergoes processing.

Purpose of the Study:

  • To investigate the effects of increased lamin synthesis on nuclear structure.
  • To explore the role of CaaX-mediated posttranslational modifications in membrane formation.
  • To compare induced membrane structures with known cellular compartments.

Main Methods:

  • Overexpression of lamins B1 and B2 in amphibian oocytes.
  • Transfection of HeLa cells with chimeric GFP-CaaX constructs.

Related Experiment Videos

  • Analysis of induced intranuclear and cytoplasmic membrane structures.

    • Main Results:

    • Increased lamin B1/B2 synthesis induced extensive intranuclear 'lamin membrane arrays'.
    • These arrays are attached to, but not continuous with, the inner nuclear membrane.
    • CaaX-motif modification is essential for inducing these membrane proliferations.
    • Similar intranuclear stacks and cytoplasmic ER-like cisternae were observed in transfected HeLa cells.

    Conclusions:

    • CaaX-specific posttranslational modifications play a crucial role in inducing intranuclear membrane structures.
    • The study provides insights into the synthesis and assembly of CaaX-containing proteins.
    • The findings differentiate these induced structures from lamina-associated annulate lamellae.