4TR4

Mouse iodothyronine deiodinase 3 catalytic core, active site mutant SeCys->Cys


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structure of mammalian selenocysteine-dependent iodothyronine deiodinase suggests a peroxiredoxin-like catalytic mechanism.

Schweizer, U.Schlicker, C.Braun, D.Kohrle, J.Steegborn, C.

(2014) Proc.Natl.Acad.Sci.USA 111: 10526

  • DOI: 10.1073/pnas.1323873111
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Local levels of active thyroid hormone (3,3',5-triiodothyronine) are controlled by the action of activating and inactivating iodothyronine deiodinase enzymes. Deiodinases are selenocysteine-dependent membrane proteins catalyzing the reductive elimina ...

    Local levels of active thyroid hormone (3,3',5-triiodothyronine) are controlled by the action of activating and inactivating iodothyronine deiodinase enzymes. Deiodinases are selenocysteine-dependent membrane proteins catalyzing the reductive elimination of iodide from iodothyronines through a poorly understood mechanism. We solved the crystal structure of the catalytic domain of mouse deiodinase 3 (Dio3), which reveals a close structural similarity to atypical 2-Cys peroxiredoxin(s) (Prx). The structure suggests a route for proton transfer to the substrate during deiodination and a Prx-related mechanism for subsequent recycling of the transiently oxidized enzyme. The proposed mechanism is supported by biochemical experiments and is consistent with the effects of mutations of conserved amino acids on Dio3 activity. Thioredoxin and glutaredoxin reduce the oxidized Dio3 at physiological concentrations, and dimerization appears to activate the enzyme by displacing an autoinhibitory loop from the iodothyronine binding site. Deiodinases apparently evolved from the ubiquitous Prx scaffold, and their structure and catalytic mechanism reconcile a plethora of partly conflicting data reported for these enzymes.


    Organizational Affiliation

    Institut für Biochemie und Molekularbiologie, Rheinische Friedrich Wilhelms-Universität Bonn, 53115 Bonn, Germany; uschweiz@uni-bonn.de clemens.steegborn@uni-bayreuth.de.,Department of Biochemistry and Research Center for Bio-Macromolecules, University of Bayreuth, 95440 Bayreuth, Germany uschweiz@uni-bonn.de clemens.steegborn@uni-bayreuth.de.,Institut für Biochemie und Molekularbiologie, Rheinische Friedrich Wilhelms-Universität Bonn, 53115 Bonn, Germany;,Institut für Experimentelle Endokrinologie, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany; and.,Department of Physiological Chemistry, Ruhr University Bochum, 44801 Bochum, Germany;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Type III iodothyronine deiodinase
A
191Mus musculusMutation(s): 1 
Gene Names: Dio3
EC: 1.21.99.3
Find proteins for Q91ZI8 (Mus musculus)
Go to UniProtKB:  Q91ZI8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.807α = 90.00
b = 54.188β = 90.00
c = 66.493γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
MOLREPphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-23
    Type: Initial release