Structure of mouse protocadherin 15 of the stereocilia tip link in complex with LHFPL5
- Oregon Health and Science University, United States
- National Institutes of Health, United States
Abstract
Hearing and balance involve the transduction of mechanical stimuli into electrical signals by deflection of bundles of stereocilia linked together by protocadherin 15 (PCDH15) and cadherin 23 'tip links'. PCDH15 transduces tip link tension into opening of a mechano-electrical transduction (MET) ion channel. PCDH15 also interacts with LHFPL5, a candidate subunit of the MET channel. Here we illuminate the PCDH15-LHFPL5 structure, showing how the complex is composed of PCDH15 and LHFPL5 subunit pairs related by a 2-fold axis. The extracellular cadherin domains define a mobile tether coupled to a rigid, 2-fold symmetric 'collar' proximal to the membrane bilayer. LHFPL5 forms extensive interactions with the PCDH15 transmembrane helices and stabilizes the overall PCDH15-LHFPL5 assembly. Our studies illuminate the architecture of the PCDH15-LHFPL5 complex, localize mutations associated with deafness, and shed new light on how forces in the PCDH15 tether may be transduced into the stereocilia membrane.
Data availability
The crystal structure of EC11-EL has been deposited to the Protein Data Bank under accession code 6C10. The three-dimensional cryo-EM density maps of the PCDH154EC-LHFPL5 complex and the PCDH151EC-LHFPL5 complex have been deposited to the EM database under the accession codes EMD-7327 and EMD-7328, respectively, and the coordinates for the structures have been deposited to the Protein Data Bank under the accession codes 6C13 and 6C14, respectively.
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Soluble domain of a membrane proteinPublicly available at the RCSB Protein Data Bank (accession no: PDB 6C10).
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Structure of a membrane protein complexPublicly available at the RCSB Protein Data Bank (accession no: PDB 6C13).
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Structure of a membrane protein complexPublicly available at the Electron Microscopy Data Bank (accession no: EMD-7327).
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cryoEM structure of membrane protein complexPublicly available at the RCSB Protein Data Bank (accession no: PDB 6C14).
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cryoEM structure of membrane protein complexPublicly available at the Electron Microscopy Data Bank (accession no: EMD-7328).
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Author details
Funding
National Institutes of Health (NIBIB intramural research program)
- Joy Zhao
- Peter Schuck
Howard Hughes Medical Institute
- Eric Gouaux
The funders had no role in study design, data collection and interpretation, or the decision to submit the work for publication.
Copyright
This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.
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