1Z7J

Human transthyretin (also called prealbumin) complex with 3, 3',5,5'-tetraiodothyroacetic acid (t4ac)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Ligand binding at the transthyretin dimer-dimer interface: structure of the transthyretin-T4Ac complex at 2.2 Angstrom resolution.

Neumann, P.Cody, V.Wojtczak, A.

(2005) Acta Crystallogr D Biol Crystallogr 61: 1313-1319

  • DOI: 10.1107/S0907444905022523
  • Primary Citation of Related Structures:  
    1Z7J

  • PubMed Abstract: 
  • The crystal structure of the complex of human transthyretin (hTTR) with 3,3',5,5'-tetraiodothyroacetic acid (T4Ac) has been determined to 2.2 Angstrom resolution. The complex crystallizes in the orthorhombic space group P2(1)2(1)2, with unit-cell par ...

    The crystal structure of the complex of human transthyretin (hTTR) with 3,3',5,5'-tetraiodothyroacetic acid (T4Ac) has been determined to 2.2 Angstrom resolution. The complex crystallizes in the orthorhombic space group P2(1)2(1)2, with unit-cell parameters a = 43.46, b = 85.85, c = 65.44 Angstrom. The structure was refined to R = 17.3% and R(free) = 21.9% for reflections without any sigma-cutoff. T4Ac is bound in both the forward and the reverse mode in the two binding sites of hTTR. In the forward orientation, T4Ac binds in a position similar to that described for thyroxine (T4) in the orthorhombic hTTR-T4 complex. In this orientation, the iodine substituents of the phenolic ring are bound in the P3'/P2 halogen pockets. In the reverse orientation, which is the major binding mode of T4Ac, the ligand is bound deep in the TTR channel, with the carboxylic group bound in the P3' pocket and forming simultaneous polar interactions with the residues constituting the two hormone-binding sites. Such interactions of a thyroxine-analogue ligand bound in the reverse mode have never been observed in TTR complexes previously.


    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
    • 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
    • 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 D Biol Crystallogr 52: 758

    Organizational Affiliation

    Institute of Chemistry, N. Copernicus University, Gagarina 7, 87-100 Toruń, Poland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TransthyretinAB127Homo sapiensMutation(s): 0 
Gene Names: TTRPALB
Find proteins for P02766 (Homo sapiens)
Explore P02766 
Go to UniProtKB:  P02766
NIH Common Fund Data Resources
PHAROS  P02766
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
T4A
Query on T4A

Download CCD File 
A, B
3,3',5,5'-TETRAIODOTHYROACETIC ACID
C14 H8 I4 O4
PPJYSSNKSXAVDB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.462α = 90
b = 85.858β = 90
c = 65.443γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2018-01-31
    Changes: Experimental preparation