2LSR

Solution structure of harmonin N terminal domain in complex with a exon68 encoded peptide of cadherin23


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Large protein assemblies formed by multivalent interactions between cadherin23 and harmonin suggest a stable anchorage structure at the tip link of stereocilia.

Wu, L.Pan, L.Zhang, C.Zhang, M.

(2012) J Biol Chem 287: 33460-33471

  • DOI: 10.1074/jbc.M112.378505
  • Primary Citation of Related Structures:  
    2LSR

  • PubMed Abstract: 
  • Stereocilia tip links of inner ear hair cells are subjected to constant stretching during hair-bundle deflection, and accordingly are well designed to prevent from being broken by mechanical tensions. The roots of tip links, which couple tip links with the cytoskeleton, supposedly play important roles in withstanding large forces under stimulated conditions ...

    Stereocilia tip links of inner ear hair cells are subjected to constant stretching during hair-bundle deflection, and accordingly are well designed to prevent from being broken by mechanical tensions. The roots of tip links, which couple tip links with the cytoskeleton, supposedly play important roles in withstanding large forces under stimulated conditions. The upper root of the tip link is mainly formed by the cytoplasmic tail of cadherin23 and its actin-anchoring protein harmonin. However, the detailed organization mode of the two proteins that gives rise to a strong upper root remains unclear. Here we show that the exon68-encoded peptide of cadherin23 can either interact with the N-terminal domain (NTD) of harmonin or form a homodimer. We demonstrate that the three harmonin binding sites of cadherin23, namely the NTD-binding motif, the exon68 peptide, and the C-terminal PDZ binding motif, do not synergize with each other in binding to harmonin, instead they facilitate formation of polymeric cadherin23/harmonin complexes. The exon68 peptide can promote the cadherin23/harmonin polymer formation via either binding to harmonin NTD or self-dimerization. We propose that the polymeric cadherin23/harmonin complex formed beneath the upper tip link membranes may serve as part of the stable rootlet structure for anchoring the tip links of stereocilia.


    Organizational Affiliation

    Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HarmoninA80Homo sapiensMutation(s): 0 
Gene Names: AIE75USH1C
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y6N9 (Homo sapiens)
Explore Q9Y6N9 
Go to UniProtKB:  Q9Y6N9
PHAROS:  Q9Y6N9
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
peptide from Cadherin-23B16Homo sapiensMutation(s): 1 
Gene Names: CDH23Ush1DKIAA1774KIAA1812UNQ1894/PRO4340
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H251 (Homo sapiens)
Explore Q9H251 
Go to UniProtKB:  Q9H251
PHAROS:  Q9H251
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-15
    Type: Initial release
  • Version 1.1: 2019-12-25
    Changes: Database references