3K1R

Structure of harmonin NPDZ1 in complex with the SAM-PBM of Sans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.210 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of the harmonin/sans complex reveals an unexpected interaction mode of the two Usher syndrome proteins

Yan, J.Pan, L.Chen, X.Wu, L.Zhang, M.

(2010) Proc.Natl.Acad.Sci.USA 107: 4040-4045

  • DOI: 10.1073/pnas.0911385107

  • PubMed Abstract: 
  • The hereditary hearing-vision loss disease, Usher syndrome I (USH1), is caused by defects in several proteins that can interact with each other in vitro. Defects in USH1 proteins are thought to be responsible for the developmental and functional impa ...

    The hereditary hearing-vision loss disease, Usher syndrome I (USH1), is caused by defects in several proteins that can interact with each other in vitro. Defects in USH1 proteins are thought to be responsible for the developmental and functional impairments of sensory cells in the retina and inner ear. Harmonin/USH1C and Sans/USH1G are two of the USH1 proteins that interact with each other. Harmonin also binds to other USH1 proteins such as cadherin 23 (CDH23) and protocadherin 15 (PCDH15). However, the molecular basis governing the harmonin and Sans interaction is largely unknown. Here, we report an unexpected assembly mode between harmonin and Sans. We demonstrate that the N-terminal domain and the first PDZ domain of harmonin are tethered by a small-domain C-terminal to PDZ1 to form a structural and functional supramodule responsible for binding to Sans. We discover that the SAM domain of Sans, specifically, binds to the PDZ domain of harmonin, revealing previously unknown interaction modes for both PDZ and SAM domains. We further show that the synergistic PDZ1/SAM and PDZ1/carboxyl PDZ binding-motif interactions, between harmonin and Sans, lock the two scaffold proteins into a highly stable complex. Mutations in harmonin and Sans found in USH1 patients are shown to destabilize the complex formation of the two proteins.


    Organizational Affiliation

    Department of Biochemistry, Molecular Neuroscience Center, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Harmonin
A
192Homo sapiensGene Names: USH1C (AIE75)
Find proteins for Q9Y6N9 (Homo sapiens)
Go to Gene View: USH1C
Go to UniProtKB:  Q9Y6N9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Usher syndrome type-1G protein
B
74Homo sapiensGene Names: USH1G (SANS)
Find proteins for Q495M9 (Homo sapiens)
Go to Gene View: USH1G
Go to UniProtKB:  Q495M9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.210 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 59.603α = 90.00
b = 57.775β = 104.63
c = 59.505γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASESphasing
CrystalCleardata collection
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance