1GKE

RAT TRANSTHYRETIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of rat transthyretin at 2.5 A resolution: first report on a unique tetrameric structure

Wojtczak, A.

(1997) Acta Biochim.Pol. 44: 505-517


  • PubMed Abstract: 
  • The first observation of a unique tetrameric molecular structure of transthyretin from rat (rTTR, prealbumin) is reported. The structure has been determined by X-ray diffraction using molecular replacement and the structure of human transthyretin (hT ...

    The first observation of a unique tetrameric molecular structure of transthyretin from rat (rTTR, prealbumin) is reported. The structure has been determined by X-ray diffraction using molecular replacement and the structure of human transthyretin (hTTR) as a starting model. Crystals of native rat transthyretin are tetragonal, space group P4(3)2(1)2, and have four independent monomers in the asymmetric unit of the crystal lattice. Data were collected to 2.5 A resolution and the structure has been refined to R = 18.9% for 13584 data points between 8-2.5 A resolution. Like hTTR, the rat protein is also a 54000 Da tetramer with four identical polypeptide chains of 127 amino-acid residues. Of the 22 amino-acid residues which are different in the human and rat TTR sequences, none are in the thyroxine binding domain. Analysis of these data reveal that the tertiary structure of rTTR is similar to that of hTTR with only small differences in the flexible loop regions on the surface of the protein. As a result of local changes in flexible loop regions near residues 30-41, 60-65 and 102-104, the structure of rTTR monomers is more compact than that of the corresponding hTTR monomers. The loop between residues 30-41 is bound closer to the monomer core in the former as compared with the latter structure and there is a wider opening of the space formed between these loops at two adjacent monomeric subunits. These conformational changes do not affect the interfaces between the monomeric subunits and are not transmitted to the thyroxine binding site so that its topology remains not altered.


    Organizational Affiliation

    Faculty of Chemistry, N. Copernicus University, ToruĊ„, Poland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSTHYRETIN
A, B, C, D
120Rattus norvegicusGene Names: Ttr (Tt)
Find proteins for P02767 (Rattus norvegicus)
Go to UniProtKB:  P02767
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.189 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 82.729α = 90.00
b = 82.729β = 90.00
c = 161.804γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
R-AXISdata scaling
R-AXISdata reduction
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1997-05-13 
  • Released Date: 1998-05-13 
  • Deposition Author(s): Wojtczak, A.

Revision History 

  • Version 1.0: 1998-05-13
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance