3HZF

Structure of TR-alfa bound to selective thyromimetic GC-1 in C2 space group


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.192 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Structural basis of GC-1 selectivity for thyroid hormone receptor isoforms.

Bleicher, L.Aparicio, R.Nunes, F.M.Martinez, L.Gomes Dias, S.M.Figueira, A.C.Santos, M.A.Venturelli, W.H.da Silva, R.Donate, P.M.Neves, F.A.Simeoni, L.A.Baxter, J.D.Webb, P.Skaf, M.S.Polikarpov, I.

(2008) BMC Struct Biol 8: 8-8

  • DOI: https://doi.org/10.1186/1472-6807-8-8
  • Primary Citation of Related Structures:  
    3HZF, 3ILZ, 3IMY

  • PubMed Abstract: 

    Thyroid receptors, TRalpha and TRbeta, are involved in important physiological functions such as metabolism, cholesterol level and heart activities. Whereas metabolism increase and cholesterol level lowering could be achieved by TRbeta isoform activation, TRalpha activation affects heart rates. Therefore, beta-selective thyromimetics have been developed as promising drug-candidates for treatment of obesity and elevated cholesterol level. GC-1 [3,5-dimethyl-4-(4'-hydroxy-3'-isopropylbenzyl)-phenoxy acetic acid] has ability to lower LDL cholesterol with 600- to 1400-fold more potency and approximately two- to threefold more efficacy than atorvastatin (Lipitor(c)) in studies in rats, mice and monkeys. To investigate GC-1 specificity, we solved crystal structures and performed molecular dynamics simulations of both isoforms complexed with GC-1. Crystal structures reveal that, in TRalpha Arg228 is observed in multiple conformations, an effect triggered by the differences in the interactions between GC-1 and Ser277 or the corresponding asparagine (Asn331) of TRbeta. The corresponding Arg282 of TRbeta is observed in only one single stable conformation, interacting effectively with the ligand. Molecular dynamics support this model: our simulations show that the multiple conformations can be observed for the Arg228 in TRalpha, in which the ligand interacts either strongly with the ligand or with the Ser277 residue. In contrast, a single stable Arg282 conformation is observed for TRbeta, in which it strongly interacts with both GC-1 and the Asn331. Our analysis suggests that the key factors for GC-1 selectivity are the presence of an oxyacetic acid ester oxygen and the absence of the amino group relative to T3. These results shed light into the beta-selectivity of GC-1 and may assist the development of new compounds with potential as drug candidates to the treatment of hypercholesterolemia and obesity.


  • Organizational Affiliation

    Instituto de Física de São Carlos, Universidade de São Paulo, Avenida Trabalhador São Carlense, 400 CEP 13560-970 São Carlos, SP, Brazil. lbleicher@if.sc.usp.br


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thyroid hormone receptor, alpha isoform 1 variant269Homo sapiensMutation(s): 0 
Gene Names: THRA
UniProt & NIH Common Fund Data Resources
Find proteins for P10827 (Homo sapiens)
Explore P10827 
Go to UniProtKB:  P10827
PHAROS:  P10827
GTEx:  ENSG00000126351 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10827
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
B72
Query on B72

Download Ideal Coordinates CCD File 
B [auth A]{4-[4-hydroxy-3-(1-methylethyl)benzyl]-3,5-dimethylphenoxy}acetic acid
C20 H24 O4
QNAZTOHXCZPOSA-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CAS
Query on CAS
A
L-PEPTIDE LINKINGC5 H12 As N O2 SCYS
Binding Affinity Annotations 
IDSourceBinding Affinity
B72 BindingDB:  3HZF Ki: 1.09 (nM) from 1 assay(s)
Kd: min: 0.44, max: 2.5 (nM) from 4 assay(s)
EC50: min: 3, max: 74.7 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.799α = 90
b = 78.777β = 95.17
c = 43.071γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
AMoREphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-07-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.3: 2024-11-20
    Changes: Structure summary