Experimental Data Snapshot

  • Resolution: 2.2 Å
  • R-Value Work: 0.184 

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history


Structures of human transthyretin complexed with thyroxine at 2.0 A resolution and 3',5'-dinitro-N-acetyl-L-thyronine at 2.2 A resolution.

Wojtczak, A.Cody, V.Luft, J.R.Pangborn, W.

(1996) Acta Crystallogr.,Sect.D 52: 758-765

  • DOI: 10.1107/S0907444996003046
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The molecular structures of two human transthyretin (hTTR, prealbumin) complexes, co-crystallized with thyroxine (3,5,3',5'-tetraiodo-L-thyronine; T(4)), and with 3',5'-dinitro-N-acetyl-LL-thyronine (DNNAT), were determined by X-ray diffraction metho ...

    The molecular structures of two human transthyretin (hTTR, prealbumin) complexes, co-crystallized with thyroxine (3,5,3',5'-tetraiodo-L-thyronine; T(4)), and with 3',5'-dinitro-N-acetyl-LL-thyronine (DNNAT), were determined by X-ray diffraction methods. Crystals of both structures are orthorhombic, space group P2(1)2(1)2, and have two independent monomers in the asymmetric unit of the crystal lattice. These structures have been refined to 17.0% for 8-2.0 A resolution data for the T(4) complex (I), and to R = 18.4% for 8-2.2 A resolution data for the DNNAT structure (II). This report provides a detailed description of T(4) binding to wild-type hTTR at 2.0 A resolution, as well as DNNAT. In both structures, the two independent hormone-binding sites of the TTR tetramer are occupied by ligand. A 50% statistical disorder model was applied to account for the crystallographic twofold symmetry along the binding channel and the lack of such symmetry for the ligands. Results for the co-crystallized T(4) complex show that T(4) binds deep in the hormone-binding channel and displaces the bound water previously reported for T(4) soaked into a native transthyretin crystal [Blake & Oatley (1977). Nature (London), 268, 115-120]. DNNAT also binds deeper in the channel toward the tetramer center than T(4) with the nitro groups occupying the symmetrical innermost halogen pockets. The N-acetyl moiety does not form polar contacts with the protein side chains as it is oriented toward the center of the channel. The weak binding affinity of DNNAT results from the loss of hydrophobic interactions with the halogen binding pockets as observed in T(4) binding. These data suggest that the halogen-binding sites toward the tetramer center are of primary importance as they are occupied by analogues with weak affinity to TTR, and are therefore selected over the other halogen sites which contribute more strongly to the overall binding affinity.

    Related Citations: 
    • Structural Aspects of Inotropic Bipyridine Binding. Crystal Structure Determination to 1.9 A of the Human Serum Transthyretin-Milrinone Complex
      Wojtczak, A.,Luft, J.R.,Cody, V.
      (1993) J.Biol.Chem. 268: 6202
    • Protein-DNA and Protein-Hormone Interactions in Prealbumin: A Model of the Thyroid Hormone Nuclear Receptor?
      Blake, C.C.,Oatley, S.J.
      (1977) Nature 268: 115
    • 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
    • An X-Ray Study of the Subunit Structure of Prealbumin
      Blake, C.C.,Swan, I.D.,Rerat, C.,Berthou, J.,Laurent, A.,Rerat, B.
      (1971) J.Mol.Biol. 61: 217
    • Structure of Human Plasma Prealbumin at 2.5 A Resolution. A Preliminary Report on the Polypeptide Chain Conformation, Quaternary Structure and Thyroxine Binding
      Blake, C.C.F.,Geisow, M.J.,Swan, I.D.,Rerat, C.,Rerat, B.
      (1974) J.Mol.Biol. 88: 1
    • 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

    Organizational Affiliation

    Hauptman-Woodward Medical Research Institute, Inc., Buffalo, NY 14203, USA.


Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
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 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
Query on P28

Download SDF File 
Download CCD File 
A, B
C17 H15 N3 O9
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Resolution: 2.2 Å
  • R-Value Work: 0.184 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 43.621α = 90.00
b = 86.041β = 90.00
c = 64.953γ = 90.00
Software Package:
Software NamePurpose

Structure Validation

View Full Validation Report or Ramachandran Plots

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-04-21
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other