3FCB

Crystal structure of transthyretin in complex with iododiflunisal-betaAlaOH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Iodine atoms: a new molecular feature for the design of potent transthyretin fibrillogenesis inhibitors.

Mairal, T.Nieto, J.Pinto, M.Almeida, M.R.Gales, L.Ballesteros, A.Barluenga, J.Perez, J.J.Vazquez, J.T.Centeno, N.B.Saraiva, M.J.Damas, A.M.Planas, A.Arsequell, G.Valencia, G.

(2009) Plos One 4: e4124-e4124

  • DOI: 10.1371/journal.pone.0004124
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The thyroid hormone and retinol transporter protein known as transthyretin (TTR) is in the origin of one of the 20 or so known amyloid diseases. TTR self assembles as a homotetramer leaving a central hydrophobic channel with two symmetrical binding s ...

    The thyroid hormone and retinol transporter protein known as transthyretin (TTR) is in the origin of one of the 20 or so known amyloid diseases. TTR self assembles as a homotetramer leaving a central hydrophobic channel with two symmetrical binding sites. The aggregation pathway of TTR into amiloid fibrils is not yet well characterized but in vitro binding of thyroid hormones and other small organic molecules to TTR binding channel results in tetramer stabilization which prevents amyloid formation in an extent which is proportional to the binding constant. Up to now, TTR aggregation inhibitors have been designed looking at various structural features of this binding channel others than its ability to host iodine atoms. In the present work, greatly improved inhibitors have been designed and tested by taking into account that thyroid hormones are unique in human biochemistry owing to the presence of multiple iodine atoms in their molecules which are probed to interact with specific halogen binding domains sitting at the TTR binding channel. The new TTR fibrillogenesis inhibitors are based on the diflunisal core structure because diflunisal is a registered salicylate drug with NSAID activity now undergoing clinical trials for TTR amyloid diseases. Biochemical and biophysical evidence confirms that iodine atoms can be an important design feature in the search for candidate drugs for TTR related amyloidosis.


    Organizational Affiliation

    Unit of Glycoconjugate Chemistry, Institut de Química Avançada de Catalunya, I.Q.A.C.-C.S.I.C., Barcelona, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
transthyretin
A, B
124Homo sapiensGene 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
IFB
Query on IFB

Download SDF File 
Download CCD File 
A, B
N-[(2',4'-DIFLUORO-4-HYDROXY-5-IODOBIPHENYL-3-YL)CARBONYL]-BETA-ALANINE
C16 H12 F2 I N O4
YZQVXOZCPWWABX-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IFBIC50: 4900 nM BINDINGMOAD
IFBIC50: 4900 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.973α = 90.00
b = 85.657β = 90.00
c = 63.639γ = 90.00
Software Package:
Software NamePurpose
DNAdata collection
SCALAdata scaling
MOSFLMdata reduction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-11-21 
  • Released Date: 2009-02-17 
  • Deposition Author(s): Gales, L., Damas, A.M.

Revision History 

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance