1THA

MECHANISM OF MOLECULAR RECOGNITION. STRUCTURAL ASPECTS OF 3,3'-DIIODO-L-THYRONINE BINDING TO HUMAN SERUM TRANSTHYRETIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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: 353-357


  • PubMed Abstract: 
  • The three-dimensional structure of the thyroid hormone metabolite, 3,3'-diiodo-L-thyronine (3,3'-T2), complex with human serum transthyretin (TTR) has been refined to R = 18.5% for 8-2 A resolution data. This is the first detailed description of a th ...

    The three-dimensional structure of the thyroid hormone metabolite, 3,3'-diiodo-L-thyronine (3,3'-T2), complex with human serum transthyretin (TTR) has been refined to R = 18.5% for 8-2 A resolution data. This is the first detailed description of a thyroid hormone metabolite binding to a thyroid transport protein. The four TTR monomeric subunits form a tetramer in the same manner as the native transthyretin reported earlier (Blake, C. C. F., Geisow, M. J., Oatley, S. J., Rerat, B., and Rerat, C. (1978) J. Mol. Biol. 121, 339-356). The two hormone binding sites of the TTR tetramer are occupied by 3,3'-T2. A statistical disorder model for the ligand was applied with a 50% occupancy to account for the discrepancy between the crystallographic 2-fold symmetry of the binding sites and the lack of such symmetry for 3,3'-T2. The bound metabolite has an overall transoid conformation with the either bridge intermediate between skewed and perpendicular. The hormone metabolite is bound 3.5 A deeper and with a different orientation in the channel than observed for thyroxine (T4), thereby revealing the presence of another set of halogen binding sites close to the center of the tetramer. When compared with the binding of T4, these data show that the 3-iodine of 3,3'-T2 occupies the same site as the 3'-iodine of T4, and the metabolite 3'-iodine occupies the water site observed in the T4 complex. The binding affinity of 3,3'-T2, which is 100-fold lower than that of T4, reflects the lack of the second pair of iodine atoms interacting in the channel. In order to understand the tighter binding of T4 observed in the Ala-109----Thr mutant, modeling studies were carried out that indicate that this modification could shorten the contacts between thyroid hormone iodines and residues 108-110 of the binding site.


    Related Citations: 
    • Feldmann, R.J.
      (1976) Atlas of Macromolecular Structure on Microfiche --: 549
    • Dayhoff, M.O.
      (1976) Atlas of Protein Sequence and Structure,Supplement 2 5: 265
    • 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
    • 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
    • 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


    Organizational Affiliation

    Medical Foundation of Buffalo Inc., New York 14203.




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 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
T33
Query on T33

Download SDF File 
Download CCD File 
A, B
3,3'-DEIODO-THYROXINE
C15 H13 I2 N O4
CPCJBZABTUOGNM-LBPRGKRZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 43.927α = 90.00
b = 86.653β = 90.00
c = 65.645γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement
CORELSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-01-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other