3B56

Crystal structure of transthyretin in complex with 3,5-diiodosalicylic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Iodination of salicylic acid improves its binding to transthyretin

Gales, L.Almeida, M.R.Arsequell, G.Valencia, G.Saraiva, M.J.Damas, A.M.

(2008) Biochim.Biophys.Acta 1784: 512-517

  • DOI: 10.1016/j.bbapap.2007.11.014

  • PubMed Abstract: 
  • Transthyretin (TTR) is a plasma homotetrameric protein associated with senile systemic amyloidosis and familial amyloidotic polyneuropathy. In theses cases, TTR dissociation and misfolding induces the formation of amyloidogenic intermediates that ass ...

    Transthyretin (TTR) is a plasma homotetrameric protein associated with senile systemic amyloidosis and familial amyloidotic polyneuropathy. In theses cases, TTR dissociation and misfolding induces the formation of amyloidogenic intermediates that assemble into toxic oligomeric species and lead to the formation of fibrils present in amyloid deposits. The four TTR monomers associate around a central hydrophobic channel where two thyroxine molecules can bind simultaneously. In each thyroxine binding site there are three pairs of symmetry related halogen binding pockets which can accommodate the four iodine substituents of thyroxine. A number of structurally diverse small molecules that bind to the TTR channel increasing the protein stability and thereafter inhibiting amyloid fibrillogenesis have been tested. In order to take advantage of the high propensity to interactions between iodine substituents and the TTR channel we have identified two iodinated derivatives of salicylic acid, 5-iodosalicylic acid and 3,5-diiodosalicylic acid, available commercially. We report in this paper the relative binding affinities of salicylic acid and the two iodinated derivatives and the crystal structure of TTR complexed with 3,5-diiodosalicylic acid, to elucidate the higher binding affinity of this compound towards TTR.


    Organizational Affiliation

    ICBAS - Instituto de Ciências Biomédicas Abel Salazar, Largo Prof. Abel Salazar, 2, 4099-003 Porto, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transthyretin
A, B
127Homo 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 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DIU
Query on DIU

Download SDF File 
Download CCD File 
A, B
2-HYDROXY-3,5-DIIODO-BENZOIC ACID
2-HYDROXY-3,5-DIIODOBENZOIC ACID
C7 H4 I2 O3
DHZVWQPHNWDCFS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.189 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.539α = 90.00
b = 85.757β = 90.00
c = 64.346γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
REFMACrefinement
DNAdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-10-25 
  • Released Date: 2008-01-15 
  • Deposition Author(s): Gales, L., Damas, A.M.

Revision History 

  • Version 1.0: 2008-01-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance