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Immunogold localisation of the intermediate chain within the protein complex of cytoplasmic dynein

W Steffen1, J L Hodgkinson, G Wiche

  • 1University of Vienna, Institute of Biochemistry and Molecular Cell Biology, Biocenter, Dr. Bohrgasse 9, A-1030, Vienna, Austria.

Journal of Structural Biology
|November 1, 1996
PubMed

Insights

Researchers mapped the cytoplasmic dynein intermediate chain using immunoelectron microscopy. This finding supports a potential docking function for this essential motor protein component.

Area of Science:

  • Cell Biology
  • Molecular Motors
  • Protein Localization

Background:

  • Cytoplasmic dynein is a crucial motor protein complex responsible for intracellular transport.
  • The precise structural organization and functional domains of dynein subunits remain incompletely understood.

Purpose of the Study:

  • To determine the specific location of the intermediate chain within the cytoplasmic dynein complex.
  • To provide the first structural map of a cytoplasmic dynein component.

Main Methods:

  • Generation of two specific monoclonal antibodies (m74-1 and m74-2) targeting the intermediate chain.
  • Validation of antibody specificity using SDS-PAGE immunoblots and ELISA assays.
  • Immunoelectron microscopy with gold-conjugated antibodies on purified bovine brain cytoplasmic dynein.

Main Results:

  • The intermediate chain was localized to the base of the V-shaped stalk, opposite the globular heads of the dynein complex.
  • Antibodies m74-1 and m74-2 successfully recognized the intermediate chain in both native and denatured states.

Conclusions:

  • The intermediate chain of cytoplasmic dynein is situated at the base of the motor complex.
  • This localization supports a proposed docking function for the intermediate chain within the dynein structure.

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