4BVA

Crystal structure of the NADPH-T3 form of mouse Mu-crystallin.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of Mouse Mu-Crystallin Complexed with Nadph and the T3 Thyroid Hormone

Borel, F.Hachi, I.Palencia, A.Gaillard, M.C.Ferrer, J.L.

(2014) FEBS J. 281: 1598

  • DOI: 10.1111/febs.12726
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mu-crystallin (CRYM), first described as a structural component of the eye lens in marsupials, has been characterized as an NADPH-dependent cytosolic T3 thyroid hormone (triiodothyronine) binding protein. More recently, CRYM has also been associated ...

    Mu-crystallin (CRYM), first described as a structural component of the eye lens in marsupials, has been characterized as an NADPH-dependent cytosolic T3 thyroid hormone (triiodothyronine) binding protein. More recently, CRYM has also been associated with ketimine reductase activity. Here, we report three crystal structures: mouse CRYM (mCRYM) in its apo form, in a form complexed with NADPH, and in a form with both NADPH and triiodothyronine bound. Comparison of the apo and NADPH forms reveals a rearrangement of the protein upon NADPH binding that reduces the degrees of freedom of several residues and traps the conformation of the binding pocket in a more T3 competent state. These findings are in agreement with the cooperative mechanism identified using isothermal titration calorimetry. Our structure with T3 reveals for the first time the location of the hormone binding site and shows its detailed interactions. T3 binding involves mainly hydrophobic interactions. Only five residues, either directly or through bridging water molecules, are hydrogen bonded to the hormone. Using in silico docking analysis, a series of ring-containing hydrophobic molecules were identified as potential mCRYM ligands, suggesting that the specificity for the recognition of the hydrophobic part of the hormone might be low. This is in agreement with the ketimine reductase activity that has been identified for ovine CRYM, as it demonstrates how a protein known as a thyroid hormone transporter can accommodate the ringed molecules required for its ketimine reductase activity. In the light of our results, a putative role of CRYM in thyroid hormone metabolism is also discussed.


    Organizational Affiliation

    Institut de Biologie Structurale, Université de Grenoble Alpes, CEA, CNRS, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
THIOMORPHOLINE-CARBOXYLATE DEHYDROGENASE
A, B
335Mus musculusMutation(s): 0 
Gene Names: Crym
EC: 1.5.1.25
Find proteins for O54983 (Mus musculus)
Go to UniProtKB:  O54983
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A, B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
T3
Query on T3

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Download CCD File 
A, B
3,5,3'TRIIODOTHYRONINE
T3; THYROID HORMONE; LIOTHYRONINE
C15 H12 I3 N O4
AUYYCJSJGJYCDS-LBPRGKRZSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
A, B
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
T3Kd: 60 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.146 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.240α = 90.00
b = 97.140β = 104.90
c = 75.670γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata scaling
REFMACrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-02-05
    Type: Initial release
  • Version 1.1: 2014-04-02
    Type: Database references