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Published on: January 11, 2017
EHD2 regulates caveolar dynamics via ATP-driven targeting and oligomerization
Björn Morén1, Claudio Shah, Mark T Howes
1Medical Biochemistry and Biophysics, Laboratory for Molecular Infection Medicine, Sweden, Umeå University, Umeå, Sweden.
Molecular Biology of the Cell
|February 11, 2012
Summary
Eps15 homology domain-containing 2 (EHD2) protein stabilizes caveolae at the plasma membrane, controlling their turnover. EHD2 acts as a third structural component, distinct from its previously suggested role in endocytosis.
Area of Science:
- Cell Biology
- Membrane Biology
- Protein Biochemistry
Background:
- Eps15 homology domain-containing 2 (EHD2) is a dynamin-related ATPase implicated in membrane remodeling.
- Previous studies suggested EHD2's involvement in clathrin-mediated endocytosis and endosomal recycling.
Purpose of the Study:
- To investigate the specific role and localization of EHD2 within cellular membranes.
- To elucidate the molecular mechanisms governing EHD2's association with specific membrane structures.
Main Methods:
- Immunofluorescence microscopy to visualize EHD2 localization.
- Co-immunoprecipitation assays to identify interacting proteins.
- Biochemical assays to assess ATPase activity and membrane binding.
- Knockdown studies using siRNA to evaluate EHD2 function in caveolae dynamics.
Main Results:
- EHD2 is specifically and stably associated with caveolae at the plasma membrane, not involved in clathrin-mediated endocytosis.
- EHD2 interacts with pacsin2 and cavin1, with its assembly dependent on cavin1 and caveolar integrity.
- A loop in the nucleotide-binding domain, along with ATP binding, is crucial for EHD2's caveolar localization.
- While not essential for caveolae formation, high EHD2 levels distort caveolae; however, EHD2 assembly stabilizes caveolae and controls their turnover.
Conclusions:
- EHD2 is a novel structural component of caveolae, distinct from caveolins and cavins.
- EHD2 plays a critical role in stabilizing caveolae at the plasma membrane and regulating their dynamic turnover.
- EHD2's function is linked to its oligomerization and ATP-dependent localization within the caveolae structure.
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