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Published on: October 17, 2014
Cadherin 23-C Regulates Microtubule Networks by Modifying CAMSAP3's Function
Satoe Takahashi1, Vincent J Mui1, Samuel K Rosenberg1
1Department of Otolaryngology - Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA.
Cadherin-related 23 (CDH23) directly binds to CAMSAP3/Marshalin, a microtubule (MT) regulator. This interaction, crucial for hearing and vision, modifies MT networks and is impaired by Usher Syndrome mutations.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Cadherin-related 23 (CDH23) is vital for hearing and vision.
- CAMSAP3/Marshalin regulates microtubule (MT) networks.
- Both proteins are found in the organ of Corti, but their functional connection was unknown.
Purpose of the Study:
- To investigate the functional relationship between CDH23 and CAMSAP3/Marshalin.
- To identify the molecular mechanism of their interaction.
- To determine the role of this interaction in hearing and vision.
Main Methods:
- Protein binding assays (in vivo and in vitro).
- Identification of protein interaction domains (CKK, CBM).
- Site-directed mutagenesis to mimic Usher Syndrome mutation (CDH23 R55H).
Main Results:
- CDH23-C directly binds to CAMSAP3/Marshalin.
- CDH23-C inhibits CAMSAP3/Marshalin-induced bundle formation via its CKK domain.
- A conserved CKK binding motif (CBM) in CDH23-C mediates the interaction.
- The Usher Syndrome mutation R3175H in CDH23 impairs CAMSAP3/Marshalin binding.
Conclusions:
- CDH23-C interacts with CAMSAP3/Marshalin, modulating MT networks.
- This interaction is essential for proper function in hearing and vision.
- The identified binding site and the effect of mutations highlight the clinical relevance of this molecular interaction.
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