4AQE

CRYSTAL STRUCTURE OF DEAFNESS ASSOCIATED MUTANT MOUSE CADHERIN-23 EC1- 2S70P AND PROTOCADHERIN-15 EC1-2 FORM I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of a Force-Conveying Cadherin Bond Essential for Inner-Ear Mechanotransduction

Sotomayor, M.Weihofen, W.Gaudet, R.Corey, D.P.

(2012) Nature 492: 128

  • DOI: 10.1038/nature11590
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Hearing and balance use hair cells in the inner ear to transform mechanical stimuli into electrical signals. Mechanical force from sound waves or head movements is conveyed to hair-cell transduction channels by tip links, fine filaments formed by two ...

    Hearing and balance use hair cells in the inner ear to transform mechanical stimuli into electrical signals. Mechanical force from sound waves or head movements is conveyed to hair-cell transduction channels by tip links, fine filaments formed by two atypical cadherins known as protocadherin 15 and cadherin 23 (refs 4, 5). These two proteins are involved in inherited deafness and feature long extracellular domains that interact tip-to-tip in a Ca(2+)-dependent manner. However, the molecular architecture of this complex is unknown. Here we combine crystallography, molecular dynamics simulations and binding experiments to characterize the protocadherin 15-cadherin 23 bond. We find a unique cadherin interaction mechanism, in which the two most amino-terminal cadherin repeats (extracellular cadherin repeats 1 and 2) of each protein interact to form an overlapped, antiparallel heterodimer. Simulations predict that this tip-link bond is mechanically strong enough to resist forces in hair cells. In addition, the complex is shown to become unstable in response to Ca(2+) removal owing to increased flexure of Ca(2+)-free cadherin repeats. Finally, we use structures and biochemical measurements to study the molecular mechanisms by which deafness mutations disrupt tip-link function. Overall, our results shed light on the molecular mechanics of hair-cell sensory transduction and on new interaction mechanisms for cadherins, a large protein family implicated in tissue and organ morphogenesis, neural connectivity and cancer.


    Organizational Affiliation

    Howard Hughes Medical Institute and Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CADHERIN-23
A
214Mus musculusMutation(s): 1 
Gene Names: Cdh23
Find proteins for Q99PF4 (Mus musculus)
Go to UniProtKB:  Q99PF4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTOCADHERIN-15
B
242Mus musculusMutation(s): 0 
Gene Names: Pcdh15
Find proteins for Q99PJ1 (Mus musculus)
Go to UniProtKB:  Q99PJ1
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.173 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 174.023α = 90.00
b = 40.866β = 102.95
c = 84.775γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
REFMACrefinement
HKL-2000data reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2012-11-21
    Type: Database references
  • Version 1.2: 2012-12-12
    Type: Database references