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Hook2 contributes to aggresome formation.

Györgyi Szebenyi1, W Christian Wigley, Branden Hall

  • 1Center for Basic Neuroscience, University of Texas, Southwestern Medical Center, Dallas, Texas 75390-9111, USA. gspb@prodigy.net <gspb@prodigy.net>

BMC Cell Biology
|June 2, 2007
PubMed
Summary
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Hook2 protein facilitates the formation of aggresomes, which are cellular structures that sequester misfolded proteins. This protein is crucial for transporting protein aggregates to the centrosome for cellular cleanup.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Degradation

Background:

  • Aggresomes are cellular compartments containing misfolded proteins, chaperones, and proteasomes, localized near the centrosome.
  • Active, microtubule-dependent transport is essential for aggresome positioning.
  • Hook proteins act as adaptors, linking organelles to motor proteins like dynein for transport.

Purpose of the Study:

  • To investigate the role of Hook2 protein in aggresome formation and pericentrosomal localization.
  • To determine if Hook2 is involved in the transport of protein aggregates to aggresomes.

Main Methods:

  • Overexpression of wild-type and mutant forms of Hook2.
  • Analysis of aggresome formation using the cystic fibrosis transmembrane regulator as a model cargo.

Related Experiment Videos

  • Assessment of Hook2's interaction with centriolin.

    • Main Results:

    • Overexpression of Hook2 enhances the accumulation of the cystic fibrosis transmembrane regulator in aggresomes.
    • A dominant-negative Hook2 mutant lacking the C-terminal centriolin-binding domain inhibits aggresome formation.
    • Hook2's function in aggresome formation is independent of changes in cargo biochemical properties or steady-state levels.

    Conclusions:

    • Hook2 plays a significant role in the establishment and maintenance of aggresome localization at the pericentrosome.
    • Hook2 promotes the microtubule-based delivery of protein aggregates to pericentriolar aggresomes.