Crystal structure of transthyretin in complex with diflunisal at acidic pH

Experimental Data Snapshot

  • Resolution: 1.69 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 

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This is version 1.3 of the entry. See complete history


Structural evidence for native state stabilization of a conformationally labile amyloidogenic transthyretin variant by fibrillogenesis inhibitors.

Zanotti, G.Cendron, L.Folli, C.Florio, P.Imbimbo, B.P.Berni, R.

(2013) FEBS Lett 587: 2325-2331

  • DOI: https://doi.org/10.1016/j.febslet.2013.06.016
  • Primary Citation of Related Structures:  
    4I85, 4I87, 4I89

  • PubMed Abstract: 

    Several classes of chemicals are able to bind to the thyroxine binding sites of transthyretin (TTR), stabilizing its native state and inhibiting in vitro the amyloidogenic process. The amyloidogenic I84S TTR variant undergoes a large conformational change at moderately acidic pH. Structural evidence has been obtained by X-ray analysis for the native state stabilization of I84S TTR by two chemically distinct fibrillogenesis inhibitors. In fact, they fully prevent the acidic pH-induced protein conformational change as a result of a long-range stabilizing effect. This study provides further support to the therapeutic strategy based on the use of TTR stabilizers as anti-amyloidogenic drugs.

  • Organizational Affiliation

    Department of Biomedical Sciences, University of Padua, Viale G. Colombo 3, 35131 Padova, Italy. giuseppe.zanotti@unipd.it

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
127Homo sapiensMutation(s): 1 
Gene Names: PALBTTR
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens)
Explore P02766 
Go to UniProtKB:  P02766
PHAROS:  P02766
GTEx:  ENSG00000118271 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02766
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1FL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C13 H8 F2 O3
Binding Affinity Annotations 
IDSourceBinding Affinity
1FL BindingDB:  4I89 Kd: min: 75, max: 5600 (nM) from 5 assay(s)
IC50: min: 1.20e+4, max: 2.50e+4 (nM) from 2 assay(s)
EC50: 5600 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.69 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.192 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.8α = 90
b = 86.22β = 90
c = 64.32γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-19
    Type: Initial release
  • Version 1.1: 2013-07-10
    Changes: Database references
  • Version 1.2: 2013-08-07
    Changes: Non-polymer description
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description