1NQ1

TR Receptor Mutations Conferring Hormone Resistance and Reduced Corepressor Release Exhibit Decreased Stability in the Nterminal LBD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Thyroid hormone receptor-beta mutations conferring hormone resistance and reduced corepressor release exhibit decreased stability in the N-terminal ligand-binding domain

Huber, B.R.Desclozeaux, M.West, B.L.Cunha-Lima, S.T.Nguyen, H.T.Baxter, J.D.Ingraham, H.A.Fletterick, R.J.

(2003) Mol.Endocrinol. 17: 107-116

  • DOI: 10.1210/me.2002-0097
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Resistance to thyroid hormone (RTH) syndrome is associated with mutations in the human thyroid hormone receptor-beta (hTRbeta), many of which show marked reduction in hormone binding. Here, we investigated the structural consequences of two RTH mutan ...

    Resistance to thyroid hormone (RTH) syndrome is associated with mutations in the human thyroid hormone receptor-beta (hTRbeta), many of which show marked reduction in hormone binding. Here, we investigated the structural consequences of two RTH mutants (A234T and R243Q), residing in the flexible N-terminal portion of the ligand binding domain (LBD), which exhibit modestly reduced hormone binding with impaired release of corepressor. X-ray crystallography analyses revealed that these two RTH mutants modulate the position of this flexible region by either altering the movement of helix 1 (A234T) or disrupting a salt bridge (R243Q). The subsequent increased flexibility and mobility in regions after the two sites of mutation coincided with a disorganized LBD. Consistent with this finding, the ability of these mutant N-terminal regions (234-260) to recruit the remaining LBD was decreased in a ligand-dependent helix assembly assay. Collectively, these data suggest that structural information imparted by the flexible segment in the N-terminal LBD is critical for overall stability of the LBD. Thus, these structural analyses provide mechanistic insight into the etiology of RTH disease in human TRbeta mutants that exhibit hormone binding with decreased ligand-dependent corepressor release.


    Organizational Affiliation

    Graduate Group in Biophysics, University of California, San Francisco, California 94143-0448, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thyroid hormone receptor beta-1
A
263Homo sapiensMutation(s): 1 
Gene Names: THRB (ERBA2, NR1A2, THR1)
Find proteins for P10828 (Homo sapiens)
Go to Gene View: THRB
Go to UniProtKB:  P10828
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ARS
Query on ARS

Download SDF File 
Download CCD File 
A
ARSENIC
As
RBFQJDQYXXHULB-UHFFFAOYSA-N
 Ligand Interaction
4HY
Query on 4HY

Download SDF File 
Download CCD File 
A
[4-(4-HYDROXY-3-IODO-PHENOXY)-3,5-DIIODO-PHENYL]-ACETIC ACID
C14 H9 I3 O4
UOWZUVNAGUAEQC-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
4HYIC50: 0 - 0.1 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.239 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 68.839α = 90.00
b = 68.839β = 90.00
c = 130.530γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance