3SSG

Structure of transthyretin L55P in complex with Zn


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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.,Sect.D 67: 1035-1044

  • DOI: 10.1107/S090744491104491X

  • 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). Amyloi ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transthyretin
A
127Homo sapiensMutation(s): 1 
Gene Names: TTR (PALB)
Find proteins for P02766 (Homo sapiens)
Go to Gene View: TTR
Go to UniProtKB:  P02766
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CAC
Query on CAC

Download SDF File 
Download CCD File 
A
CACODYLATE ION
dimethylarsinate
C2 H6 As O2
OGGXGZAMXPVRFZ-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.203 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 54.615α = 90.00
b = 54.615β = 90.00
c = 86.564γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHASESphasing
MOSFLMdata reduction
REFMACrefinement
DNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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