Macromolecule Content

• Total Structure Weight: 10.59 kDa 
• Atom Count: 742 
• Residue Count: 100 
• Unique protein chains: 2

2KBS

Solution structure of harmonin PDZ2 in complex with the carboxyl tail peptide of cadherin23

• DOI: 10.2210/pdb2KBS/pdb

• Classification: STRUCTURAL PROTEIN/CELL ADHESION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2008-12-05 Released: 2009-03-31 
• Deposition Author(s): Pan, L., Yan, J., Wu, L., Zhang, M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Assembling stable hair cell tip link complex via multidentate interactions between harmonin and cadherin 23

Pan, L., Yan, J., Wu, L., Zhang, M.

(2009) Proc Natl Acad Sci U S A 106: 5575-5580

• PubMed: 19297620 
• DOI: 10.1073/pnas.0901819106
• Primary Citation of Related Structures:  
  2KBS, 2KBR, 2KBQ


• PubMed Abstract: 
  

The hereditary hearing-vision loss disease Usher syndrome (USH) is caused by defects in several proteins, most of which form an integrated protein network called Usher interactome. Harmonin/Ush1C is a master scaffold in the assembly of the Usher protein complexes, because harmonin is known to bind to every protein in the Usher interactome. However, the biochemical and structural mechanism governing the Usher protein complex formation is largely unclear. Here, we report that the highly-conserved N-terminal fragment of harmonin (N-domain) immediately preceding its PDZ1 adopts an autonomously-folded domain. We discovered that the N-domain specifically binds to a short internal peptide fragment of the cadherin 23 cytoplasmic domain. The structures of the harmonin N-domain alone and in complex with the cadherin 23 internal peptide fragment uncovered the detailed binding mechanism of this interaction between harmonin and cadherin 23. We further elucidated the harmonin PDZ domain-mediated cadherin 23 binding by solving the structure of the second harmonin PDZ domain in complex with the cadherin 23 carboxyl tail. The multidentate binding mode between harmonin and cadherin 23 provides a structural and biochemical basis for the harmonin-mediated assembly of stable tip link complex in the auditory hair cells.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Harmonin	A	92	Homo sapiens	Mutation(s): 0  Gene Names: HARMONIN, USH1C, AIE75
Find proteins for Q9Y6N9 (Homo sapiens) Explore Q9Y6N9  Go to UniProtKB:  Q9Y6N9
NIH Common Fund Data Resources
PHAROS  Q9Y6N9 GTEx  ENSG00000006611

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
octameric peptide from Cadherin-23	B	8	Homo sapiens	Mutation(s): 0  Gene Names: Cadherin23, CDH23, KIAA1774, KIAA1812, UNQ1894/PRO4340
Find proteins for Q9H251 (Homo sapiens) Explore Q9H251  Go to UniProtKB:  Q9H251
NIH Common Fund Data Resources
PHAROS  Q9H251 GTEx  ENSG00000107736

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KBS Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-12-05 
• Released Date: 2009-03-31 
Deposition Author(s): Pan, L., Yan, J., Wu, L., Zhang, M.

Revision History 

• Version 1.0: 2009-03-31
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance