1KGI

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

DOI: 10.2210/pdb1KGI/pdb

Classification: TRANSPORT PROTEIN
Organism(s): Rattus norvegicus
Mutation(s): No

Deposited: 2001-11-27 Released: 2002-11-27
Deposition Author(s): Wojtczak, A., Neumann, P., Muziol, T., Cody, V., Luft, J.R., Pangborn, W.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.80 Å
R-Value Free: 0.240
R-Value Work: 0.207
R-Value Observed: 0.204

wwPDB Validation3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Complex of rat transthyretin with tetraiodothyroacetic acid refined at 2.1 and 1.8 A resolution.

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

(2001) Acta Biochim Pol 48: 877-884

PubMed: 11995998 Search on PubMed
Structures With Same Primary Citation

PubMed Abstract:

The crystal structure of rat transthyretin (rTTR) complex with 3,5,3',5'-tetraiodothyroacetic acid (T4Ac) was determined at 1.8 A resolution with low temperature synchrotron data collected at CHESS. The structure was refined to R = 0.207 and Rfree = 0.24 with the use of 8-1.8 A data. The additional 8000 reflections from the incomplete 2.1-1.8 data shell, included in the refinement, reduced the Rfree index by 1.3%. Structure comparison with the model refined against the complete 8-2.1 A data revealed no differences in the ligand orientation and the conformation of the polypeptide chain in the core regions. However, the high-resolution data included in the refinement improved the model in the flexible regions poorly defined with the lower resolution data. Also additional sixteen water molecules were found in the difference map calculated with the extended data. The structure revealed both forward and reverse binding of tetraiodothyroacetic acid in one binding site and two modes of forward ligand binding in the second site, with the phenolic iodine atoms occupying different sets of the halogen binding pockets.

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

Structure of New Polymorphic Monoclinic Form of Hum Transthyretin at 3A Resolution Reveals a Mixed Comp between Unliganded and T4-Bound Tetramers of Ttr
Wojtczak, A., Neumann, P., Cody, V.
(2001) Acta Crystallogr D Biol Crystallogr 57: 957

STRUCTURE OF RAT (rTTR) TRANSTHYRETIN COMPLEX WITH THYROXINE AT 2.5 A RESOLUTION: FIRST NON-BIASED INS INTO THYROXINE BINDING REVEALS DIFFERENT HORMONE ORIENTATION IN TWO BINDING SITES
Wojtczak, A., Cody, V., Luft, J., Pangborn, W.
(2001) Acta Crystallogr D Biol Crystallogr 57: 1061

Organizational Affiliation:

Institute of Chemistry, Nicolaus Copernicus University, Toruń, Poland.

Macromolecules

Find similar proteins by: Sequence | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
TRANSTHYRETIN	A, B, C, D	127	Rattus norvegicus	Mutation(s): 0 Gene Names: Ttr, Tt
Find proteins for P02767 (Rattus norvegicus) Go to UniProtKB: P02767
Protein Feature View
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
T4A Query on T4A Download CCD File	C, D	3,3',5,5'-TETRAIODOTHYROACETIC ACID C₁₄ H₈ I₄ O₄ PPJYSSNKSXAVDB-UHFFFAOYSA-N		Ligand Interaction