1NUO

Two RTH Mutants with Impaired Hormone Binding


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.252 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Two resistance to thyroid hormone mutants with impaired hormone binding

Huber, B.R.Sandler, B.West, B.L.Cunha-Lima, S.T.Nguyen, H.T.Apriletti, J.W.Baxter, J.D.Fletterick, R.J.

(2003) Mol.Endocrinol. 17: 643-652

  • DOI: 10.1210/me.2002-0095
  • Primary Citation of Related Structures:  1NQ2

  • PubMed Abstract: 
  • Resistance to hormones is commonly due to mutations in genes encoding receptors. Resistance to thyroid hormone is due mostly to mutations of the beta-form of the human (h) thyroid hormone receptor (hTRbeta). We determined x-ray crystal structures of ...

    Resistance to hormones is commonly due to mutations in genes encoding receptors. Resistance to thyroid hormone is due mostly to mutations of the beta-form of the human (h) thyroid hormone receptor (hTRbeta). We determined x-ray crystal structures of two hTRbeta ligand-binding domains (LBDs), Ala 317 Thr and Arg 316 His. Amino acids 316 and 317 form part of the hormone-binding pocket. The methyl of Ala 317, contacting iodine, sculpts the T3 hormone-binding pocket. Arg 316 is not in direct contact with T3 and has an unknown role in function. Remarkably, the Arg forms part of an unusual buried polar cluster in hTRbeta. Although the identity of the amino acids changes, the polar cluster appears in all nuclear receptors. In spite of the differing roles of 316 and 317, both resistance to thyroid hormone mutants display decreased T3 affinity and weakened transcriptional activation. The two mutants differ in that the Arg 316 His receptor does not form TR-TR homodimers on DNA. 3,5,3'-Triiodothyroacetic acid is bound to both receptors. Thr 317 repositions 3,5,3'-triiodothyroacetic acid distending the face of the receptor that binds coregulators. Arg 316 forms two hydrogen bonds with helix 1. Both are lost with mutation to His displacing helix 1 of the LBD and disordering the loop after helix 1. The stability of the helix 1, deriving in part from the buried polar cluster, is important for hormone binding and formation of TR dimers. The observation that the Arg 316 His mutation affects these functions implies a role for helix 1 in linking hormone binding to the DNA-binding domain-LBD configuration.


    Organizational Affiliation

    University of California, San Francisco, Department of Biochemistry Biophysics, 513 Parnassus Avenue, San Francisco, California 94143-0448, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thyroid hormone receptor beta-1
A
261Homo sapiensGene Names: THRB (ERBA2, NR1A2, THR1)
Find proteins for P10828 (Homo sapiens)
Go to Gene View: THRB
Go to UniProtKB:  P10828
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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 - 0.2 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.302 
  • R-Value Work: 0.252 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 67.274α = 90.00
b = 67.274β = 90.00
c = 130.121γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
REFMACrefinement
DENZOdata reduction
CNSphasing

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: Version format compliance