Crystal structure of transthyretin in complex with CHF5075, a flurbiprofen analogue

Experimental Data Snapshot

  • Resolution: 1.30 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.180 

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Structure-activity relationships of flurbiprofen analogues as stabilizers of the amyloidogenic protein transthyretin.

Loconte, V.Menozzi, I.Ferrari, A.Folli, C.Imbimbo, B.P.Zanotti, G.Berni, R.

(2019) J Struct Biol 208: 165-173

  • DOI: https://doi.org/10.1016/j.jsb.2019.08.011
  • Primary Citation of Related Structures:  
    6R66, 6R67, 6R68, 6R6I

  • PubMed Abstract: 

    The inherent amyloidogenic potentialof wild type transthyretin (TTR) is enhanced by a large number of point mutations, which destabilize the TTR tetramer, thereby promoting its disassembly and pathological aggregation responsible for TTR-related amyloidosis. TTR stabilizers are able to interact with the thyroxine-binding sites of TTR, stabilizing its tetrameric native state and inhibiting amyloidogenesis. Herein, we report on in vitro, ex vivo, and X-ray analyses to assess the TTR structural stabilization by analogues of flurbiprofen, a non-steroidal anti-inflammatory drug (NSAID). Overall, considering together binding selectivity and protective effects on TTR native structure by flurbiprofen analogues in the presence of plasma proteins, as determined by Western Blot,the aforementioned properties of analyzed compounds appear to be better (CHF5075 and CHF4802) or similar (CHF4795) or worse (CHF5074, also known as CSP-1103) as compared to those of diflunisal, used as a reference TTR stabilizer. Molecular details of the determinants affecting the interactionsof CHF5075, CHF4802, and CHF4795 with wild type TTRand of CHF5074 withtheamyloidogenic A25TTTR variant havebeen elucidated by X-ray analysis. Distinct interactions with TTR appear to characterize flurbiprofen analogues and the NSAID diflunisal and its analogues as TTR stabilizers. Relationships between stabilizing effect on TTR by flurbiprofen analogues determined experimentally and molecular details of their interactions with TTR have been established, providing the rationale for their protective effects on the native protein structure.

  • Organizational Affiliation

    Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy. Electronic address: rodolfo.berni@unipr.it.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
147Homo sapiensMutation(s): 0 
Gene Names: TTRPALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens)
Explore P02766 
Go to UniProtKB:  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
JTN (Subject of Investigation/LOI)
Query on JTN

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
1-[4-[3,5-bis(chloranyl)phenyl]-3-fluoranyl-phenyl]cyclopropane-1-carboxylic acid
C16 H11 Cl2 F O2
Experimental Data & Validation

Experimental Data

  • Resolution: 1.30 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.3α = 90
b = 84.9β = 90
c = 63.9γ = 90
Software Package:
Software NamePurpose
XDSdata 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: 2019-09-11
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Database references