Structure of transthyretin L55P in complex with Zn

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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Structural insights into a zinc-dependent pathway leading to Leu55Pro transthyretin amyloid fibrils.

Castro-Rodrigues, A.F.Gales, L.Saraiva, M.J.Damas, A.M.

(2011) Acta Crystallogr D Biol Crystallogr 67: 1035-1044

  • DOI: https://doi.org/10.1107/S090744491104491X
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Human transthyretin (TTR) is a homotetrameric protein that is responsible for the formation of amyloid in patients with familiar amyloidotic polyneuropathy (FAP), familiar amyloidotic cardiomyopathy (FAC) and senile systemic amyloidosis (SSA). Amyloid fibrils are characterized by a cross-β structure. However, details of how TTR monomers are organized to form such an assembly remain unknown. The effect of Zn(2+) in increasing TTR L55P amyloidogenecity has been reported. Crystals of the TTR L55P-Zn(2+) complex were grown under conditions similar to those leading to higher amyloidogenic potential of the variant protein and the three-dimensional structure of the complex was determined by X-ray crystallography. Two different tetrahedral Zn(2+)-binding sites were identified: one cross-links two tetramers, while the other lies at the interface between two monomers in a dimer. The association of monomers involving the two Zn(2+)-binding sites leads to a bidimensional array with a cross-β structure. The formation of this structure and subsequent organization into amyloid fibrils was monitored by fluorescence spectroscopy and electron microscopy. The TTR L55P-Zn(2+) structure offers the first molecular insights into the role of Zn(2+) as a mediator of cross-β-type structure in TTR amyloidosis and the relevance of a Zn(2+)-dependent pathway leading to the production of early amyloidogenic intermediates is discussed.

  • Organizational Affiliation

    IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transthyretin127Homo 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: 2.00 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.615α = 90
b = 54.615β = 90
c = 86.564γ = 90
Software Package:
Software NamePurpose
DNAdata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-30
    Type: Initial release
  • Version 1.1: 2011-12-14
    Changes: Database references