1THC

CRYSTAL STRUCTURE DETERMINATION AT 2.3A OF HUMAN TRANSTHYRETIN-3',5'-DIBROMO-2',4,4',6-TETRA-HYDROXYAURONE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure determination at 2.3-A resolution of human transthyretin-3',5'-dibromo-2',4,4',6-tetrahydroxyaurone complex.

Ciszak, E.Cody, V.Luft, J.R.

(1992) Proc.Natl.Acad.Sci.USA 89: 6644-6648


  • PubMed Abstract: 
  • The crystal structure of the complex of 3',5'-dibromo-2',4,4',6-tetrahydroxyaurone, a flavone derivative, with human transthyretin (TTR), a serum thyroid hormone transport protein, has been determined and refined to R = 17.9% for data to 2.3-A resolu ...

    The crystal structure of the complex of 3',5'-dibromo-2',4,4',6-tetrahydroxyaurone, a flavone derivative, with human transthyretin (TTR), a serum thyroid hormone transport protein, has been determined and refined to R = 17.9% for data to 2.3-A resolution and provides a detailed description of a protein-bound flavonoid structure. This bromoaurone is a potent competitor for thyroid hormone binding to TTR, a 54,980-dalton alpha 4 tetrameric protein of 222 molecular symmetry, as well as an inhibitor of iodothyronine deiodinase. Crystals of the TTR-bromoaurone complex are isomorphous to those of native TTR. Interpretation of difference Fourier electron density maps revealed two binding modes for the bromoaurone in each of the two independent binding sites of the TTR tetramer: deep in the channel near Ser-117 (mode I) and near the channel entrance (mode II). None of the binding modes can be fully occupied because of overlap between binding positions. A statistical disorder for bromoaurone binding was also applied, as it binds along the twofold crystallographic axis and does not possess such symmetry. The binding of mode I and that of mode II were refined at half occupancy, resulting in two molecules per tetramer. The bromoaurone binds in a nonplanar antiskewed conformation. The molecular pattern for TTR binding consists of halogen groups able to anchor between beta-sheets to form both hydrophobic and hydrophilic contacts. Comparison of structural data for bromoaurone- and thyroxine-TTR complexes indicates that bromoaurone binding mode I is 3 A deeper in the channel and binding mode II is 4 A further from the channel center than thyroxine. The bromoaurone binding observed in this TTR complex differs significantly from that based upon computer modeling studies.


    Related Citations: 
    • Protein-DNA and Protein-Hormone Interactions in Prealbumin, a Model of the Thyroid Hormone Nuclear Receptor (Query)
      Blake, C.C.F.,Oatley, S.J.
      (1977) Nature 268: 115
    • Structure of Human Plasma Prealbumin at 2.5 Angstroms Resolution,A Preliminary Report on the Polypeptide Chain Conformation,Quaternary Structure and Thyroxine Binding
      Blake, C.C.F.,Geisow, M.J.,Swan, I.D.A.,Rerat, C.,Rerat, B.
      (1974) J.Mol.Biol. 88: 1
    • An X-Ray Study of the Subunit Structure of Prealbumin
      Blake, C.C.F.,Swan, I.D.A.,Rerat, C.,Berthou, J.,Laurent, A.,Rerat, B.
      (1971) J.Mol.Biol. 61: 217
    • Mechanism of Molecular Recognition. Structural Aspects of 3,3'-Diiodo-L-Thyronine Binding to Human Serum Transthyretin
      Wojtczak, A.,Luft, J.,Cody, V.
      (1992) J.Biol.Chem. 267: 353


    Organizational Affiliation

    Molecular Biophysics Department, Medical Foundation of Buffalo, Inc., NY 14203.




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
FL9
Query on FL9

Download SDF File 
Download CCD File 
A, B
3',5'-DIBROMO-2',4,4',6'-TETRAHYDROXY AURONE
C15 H8 Br2 O6
BRPKBUNFOZFULQ-SGAXSIHGSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 43.402α = 90.00
b = 85.837β = 90.00
c = 65.784γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1993-07-15
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Advisory, Derived calculations, Other