1N9J

Solution Structure of the 3D domain swapped dimer of Stefin A


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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This is version 1.4 of the entry. See complete history


Literature

Three-dimensional domain swapping in the folded and molten-globule states of cystatins, an amyloid-forming structural superfamily

Staniforth, R.A.Giannini, S.Higgins, L.D.Conroy, M.J.Hounslow, A.M.Jerala, R.Craven, C.J.Waltho, J.P.

(2001) EMBO J 20: 4774-4781

  • DOI: https://doi.org/10.1093/emboj/20.17.4774
  • Primary Citation of Related Structures:  
    1N9J

  • PubMed Abstract: 

    Cystatins, an amyloid-forming structural superfamily, form highly stable, domain-swapped dimers at physiological protein concentrations. In chicken cystatin, the active monomer is a kinetic trap en route to dimerization, and any changes in solution conditions or mutations that destabilize the folded state shorten the lifetime of the monomeric form. In such circumstances, amyloidogenesis will start from conditions where a domain-swapped dimer is the most prevalent species. Domain swapping occurs by a rearrangement of loop I, generating the new intermonomer interface between strands 2 and 3. The transition state for dimerization has a high level of hydrophobic group exposure, indicating that gross conformational perturbation is required for domain swapping to occur. Dimerization also occurs when chicken cystatin is in its reduced, molten-globule state, implying that the organization of secondary structure in this state mirrors that in the folded state and that domain swapping is not limited to the folded states of proteins. Although the interface between cystatin-fold units is poorly defined for cystatin A, the dimers are the appropriate size to account for the electron-dense regions in amyloid protofilaments.


  • Organizational Affiliation

    Krebs Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, Transgenomic Ltd, Western Bank, Sheffield S10 2TN, UK. r.a.staniforth@shef.ac.uk


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cystatin A
A, B
98Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P01040 (Homo sapiens)
Explore P01040 
Go to UniProtKB:  P01040
PHAROS:  P01040
GTEx:  ENSG00000121552 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01040
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-02-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection