5N5Q

Human TTR altered conformation from soaking in iron chloride.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Copper mediated amyloid-beta binding to Transthyretin.

Ciccone, L.Fruchart-Gaillard, C.Mourier, G.Savko, M.Nencetti, S.Orlandini, E.Servent, D.Stura, E.A.Shepard, W.

(2018) Sci Rep 8: 13744-13744

  • DOI: 10.1038/s41598-018-31808-5
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Transthyretin (TTR), a homotetrameric protein that transports thyroxine and retinol both in plasma and in cerebrospinal (CSF) fluid provides a natural protective response against Alzheimer's disease (AD), modulates amyloid-β (Aβ) deposition by direct ...

    Transthyretin (TTR), a homotetrameric protein that transports thyroxine and retinol both in plasma and in cerebrospinal (CSF) fluid provides a natural protective response against Alzheimer's disease (AD), modulates amyloid-β (Aβ) deposition by direct interaction and co-localizes with Aβ in plaques. TTR levels are lower in the CSF of AD patients. Zn 2+ , Mn 2+ and Fe 2+ transform TTR into a protease able to cleave Aβ. To explain these activities, monomer dissociation or conformational changes have been suggested. Here, we report that when TTR crystals are exposed to copper or iron salts, the tetramer undergoes a significant conformational change that alters the dimer-dimer interface and rearranges residues implicated in TTR's ability to neutralize Aβ. We also describe the conformational changes in TTR upon the binding of the various metal ions. Furthermore, using bio-layer interferometry (BLI) with immobilized Aβ(1-28), we observe the binding of TTR only in the presence of copper. Such Cu 2+ -dependent binding suggests a recognition mechanism whereby Cu 2+ modulates both the TTR conformation, induces a complementary Aβ structure and may participate in the interaction. Cu 2+ -soaked TTR crystals show a conformation different from that induced by Fe 2+ , and intriguingly, TTR crystals grown in presence of Aβ(1-28) show different positions for the copper sites from those grown its absence.


    Organizational Affiliation

    Dipartimento di Scienze della Terra, Universitá di Pisa, Via Santa Maria 53-55, 56100, Pisa, Italy.,CEA Institut des Sciences du Vivant Frédéric Joliot, Service d'Ingènierie Moléculaire des Protéines (SIMOPRO), Université Paris-Saclay, 91191, Gif-sur-Yvette, France.,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192, Gif-sur-Yvette, France. william.shepard@synchrotron-soleil.fr.,Dipartimento di Farmacia, Universitá di Pisa, Via Bonanno 6, 56126, Pisa, Italy.,Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192, Gif-sur-Yvette, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transthyretin
A, B
116Homo sapiensMutation(s): 0 
Gene Names: TTR (PALB)
Find proteins for P02766 (Homo sapiens)
Go to Gene View: TTR
Go to UniProtKB:  P02766
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
FE
Query on FE

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Download CCD File 
A, B
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
FFE
Query on FFE

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Download CCD File 
A
[bis(oxidanyl)-[tetrakis(oxidanyl)ferriooxy]ferrio]oxy-pentakis(oxidanyl)iron
Fe3 H11 O13
WDCOXZGBZIBJBW-UHFFFAOYSA-C
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.730α = 90.00
b = 81.810β = 90.00
c = 69.460γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
PHASERphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-03-07
    Type: Initial release
  • Version 1.1: 2018-09-26
    Type: Data collection, Database references