3TCT

Structure of wild-type TTR in complex with tafamidis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Tafamidis, a potent and selective transthyretin kinetic stabilizer that inhibits the amyloid cascade.

Bulawa, C.E.Connelly, S.Devit, M.Wang, L.Weigel, C.Fleming, J.A.Packman, J.Powers, E.T.Wiseman, R.L.Foss, T.R.Wilson, I.A.Kelly, J.W.Labaudiniere, R.

(2012) Proc.Natl.Acad.Sci.USA 109: 9629-9634

  • DOI: 10.1073/pnas.1121005109

  • PubMed Abstract: 
  • The transthyretin amyloidoses (ATTR) are invariably fatal diseases characterized by progressive neuropathy and/or cardiomyopathy. ATTR are caused by aggregation of transthyretin (TTR), a natively tetrameric protein involved in the transport of thyrox ...

    The transthyretin amyloidoses (ATTR) are invariably fatal diseases characterized by progressive neuropathy and/or cardiomyopathy. ATTR are caused by aggregation of transthyretin (TTR), a natively tetrameric protein involved in the transport of thyroxine and the vitamin A-retinol-binding protein complex. Mutations within TTR that cause autosomal dominant forms of disease facilitate tetramer dissociation, monomer misfolding, and aggregation, although wild-type TTR can also form amyloid fibrils in elderly patients. Because tetramer dissociation is the rate-limiting step in TTR amyloidogenesis, targeted therapies have focused on small molecules that kinetically stabilize the tetramer, inhibiting TTR amyloid fibril formation. One such compound, tafamidis meglumine (Fx-1006A), has recently completed Phase II/III trials for the treatment of Transthyretin Type Familial Amyloid Polyneuropathy (TTR-FAP) and demonstrated a slowing of disease progression in patients heterozygous for the V30M TTR mutation. Herein we describe the molecular and structural basis of TTR tetramer stabilization by tafamidis. Tafamidis binds selectively and with negative cooperativity (K(d)s ~2 nM and ~200 nM) to the two normally unoccupied thyroxine-binding sites of the tetramer, and kinetically stabilizes TTR. Patient-derived amyloidogenic variants of TTR, including kinetically and thermodynamically less stable mutants, are also stabilized by tafamidis binding. The crystal structure of tafamidis-bound TTR suggests that binding stabilizes the weaker dimer-dimer interface against dissociation, the rate-limiting step of amyloidogenesis.


    Organizational Affiliation

    Pfizer Orphan and Genetic Diseases Research Unit, Cambridge, MA 02140, USA. Christine.Bulawa@pfizer.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transthyretin
A, B
127Homo 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
3MI
Query on 3MI

Download SDF File 
Download CCD File 
A, B
2-(3,5-dichlorophenyl)-1,3-benzoxazole-6-carboxylic acid
Tafamidis
C14 H7 Cl2 N O3
TXEIIPDJKFWEEC-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
3MIKd: 2 nM BINDINGMOAD
3MIKd: 3 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.3 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.161 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.749α = 90.00
b = 84.994β = 90.00
c = 64.334γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
REFMACrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-30
    Type: Initial release
  • Version 1.1: 2012-08-29
    Type: Database references