5HJG

Crystal Structure of Human Transthyretin in Complex with Tetrabromobisphenol A (TBBPA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.145 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Tetrabromobisphenol A Is an Efficient Stabilizer of the Transthyretin Tetramer.

Iakovleva, I.Begum, A.Brannstrom, K.Wijsekera, A.Nilsson, L.Zhang, J.Andersson, P.L.Sauer-Eriksson, A.E.Olofsson, A.

(2016) Plos One 11: e0153529-e0153529

  • DOI: 10.1371/journal.pone.0153529
  • Also Cited By: 5JIQ, 5JIM, 5JID

  • PubMed Abstract: 
  • Amyloid formation of the human plasma protein transthyretin (TTR) is associated with several human disorders, including familial amyloidotic polyneuropathy (FAP) and senile systemic amyloidosis. Dissociation of TTR's native tetrameric assembly is the ...

    Amyloid formation of the human plasma protein transthyretin (TTR) is associated with several human disorders, including familial amyloidotic polyneuropathy (FAP) and senile systemic amyloidosis. Dissociation of TTR's native tetrameric assembly is the rate-limiting step in the conversion into amyloid, and this feature presents an avenue for intervention because binding of an appropriate ligand to the thyroxin hormone binding sites of TTR stabilizes the native tetrameric assembly and impairs conversion into amyloid. The desired features for an effective TTR stabilizer include high affinity for TTR, high selectivity in the presence of other proteins, no adverse side effects at the effective concentrations, and a long half-life in the body. In this study we show that the commonly used flame retardant tetrabromobisphenol A (TBBPA) efficiently stabilizes the tetrameric structure of TTR. The X-ray crystal structure shows TBBPA binding in the thyroxine binding pocket with bromines occupying two of the three halogen binding sites. Interestingly, TBBPA binds TTR with an extremely high selectivity in human plasma, and the effect is equal to the recently approved drug tafamidis and better than diflunisal, both of which have shown therapeutic effects against FAP. TBBPA consequently present an interesting scaffold for drug design. Its absorption, metabolism, and potential side-effects are discussed.


    Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Umeå University, Umeå, Sweden.




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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
XDI
Query on XDI

Download SDF File 
Download CCD File 
A, B
4,4'-propane-2,2-diylbis(2,6-dibromophenol)
C15 H12 Br4 O2
VEORPZCZECFIRK-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.145 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 42.358α = 90.00
b = 85.298β = 90.00
c = 63.186γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish National Research CouncilSweden--

Revision History 

  • Version 1.0: 2016-05-04
    Type: Initial release