The X-ray crystallographic structure of the amyloidogenic variant TTR Tyr78Phe

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

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X-ray crystallographic studies of two transthyretin variants: further insights into amyloidogenesis.

Neto-Silva, R.M.Macedo-Ribeiro, S.Pereira, P.J.Coll, M.Saraiva, M.J.Damas, A.M.

(2005) Acta Crystallogr D Biol Crystallogr 61: 333-339

  • DOI: https://doi.org/10.1107/S0907444904034316
  • Primary Citation of Related Structures:  
    1X7S, 1X7T

  • PubMed Abstract: 

    Transthyretin (TTR) is a homotetrameric plasma protein that, as a result of a set of not yet fully characterized conformational changes, forms fibrillar aggregates that are the major protein component of amyloid deposits. More than 80 mutations associated with TTR amyloid deposition have been described in the literature. X-ray crystallography was used to elucidate the three-dimensional structure of two important TTR variants: TTR Y78F, an amyloidogenic protein, and TTR R104H, which is associated with a protective effect over the amyloidogenic V30M mutation. The structures of those two TTR variants have been determined in space group P2(1)2(1)2 to 1.55 and 1.60 angstroms resolution, respectively, using molecular-replacement techniques. Detailed analysis of the protein model for TTR Y78F indicates a destabilization of the contacts between the alpha-helix and AB loop and the body of the molecule, intimately related to the amyloidogenic nature; contrastingly, in the TTR R104H variant new contacts involving the N-terminal region and His104 are clearly antagonists of amyloid formation.

  • Organizational Affiliation

    Molecular Structure Group, Institute for Molecular and Cell Biology, Rua do Campo Alegre No. 823, 4150 Porto, Portugal.

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

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.719α = 90
b = 86.082β = 90
c = 63.799γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-03-22
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references
  • Version 1.4: 2023-08-23
    Changes: Data collection, Refinement description