1IJN

Crystal structure of the transthyretin mutant TTR C10A/Y114C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.207 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Cys114-linked dimers of transthyretin are compatible with amyloid formation

Karlsson, A.Olofsson, A.Eneqvist, T.Sauer-Eriksson, A.E.

(2005) Biochemistry 44: 13063-13070

  • DOI: https://doi.org/10.1021/bi050795s
  • Primary Citation of Related Structures:  
    1IJN

  • PubMed Abstract: 

    The Tyr114Cys substitution in the human plasma protein transthyretin leads to a particularly aggressive form of familial amyloidotic polyneuropathy. In a previous study we demonstrated that ATTR Tyr114Cys forms intermolecular disulfide bonds, which partly impair fibril formation and result in a more amorphous morphology. Apart from the introduced cysteinyl group in position 114, the native sequence contains one cysteine located at position 10. To deduce the role of intermolecular disulfide bridging in fibril formation we generated and characterized the TTR Cys10Ala/Tyr114Cys double mutant. Our results suggest that an intermolecular cysteine bridge at position 114 enhances the exposure of cysteine 10, thereby facilitating additional intermolecular cysteine assemblies. We also purified a disulfide-linked dimeric form of TTR Cys10Ala/Tyr114Cys, which was recognized by the anti-TTR amyloid-specific monoclonal antibody MAb (39-44). Moreover, this dimeric molecule can form protofibrils indistinguishable from the fibrils formed under reducing conditions, as judged by atomic force microscopy. Assuming that both molecules of the dimer are part of the core of the fibril, the assembly is incompatible with a preserved native or near-native dimeric interphase. Our findings raise the question of whether TTR-amyloid architecture is indeed the result of one highly stringent assembly of structures or if different fibrils may be built from different underlying structures.


  • Organizational Affiliation

    Umeå Centre for Molecular Pathogenesis, Umeå University, SE-901 87 Umeå, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TRANSTHYRETIN
A, B
127Homo sapiensMutation(s): 2 
Gene Names: TTR
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens)
Explore P02766 
Go to UniProtKB:  P02766
PHAROS:  P02766
GTEx:  ENSG00000118271 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02766
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.207 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.15α = 90
b = 85.235β = 90
c = 64.797γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-06-03
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description