1N9J

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


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1093/emboj/20.17.4774

  • 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 c ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cystatin A
A, B
98Homo sapiensGene Names: CSTA (STF1, STFA)
Find proteins for P01040 (Homo sapiens)
Go to Gene View: CSTA
Go to UniProtKB:  P01040
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-25
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance