3T03

Crystal structure of PPAR gamma ligand binding domain in complex with a novel partial agonist GQ-16


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

GQ-16, a novel peroxisome proliferator-activated receptor (PPAR gamma) ligand, promotes insulin sensitization without weight gain.

Amato, A.A.Rajagopalan, S.Lin, J.Z.Carvalho, B.M.Figueira, A.C.Lu, J.Ayers, S.D.Mottin, M.Silveira, R.L.Souza, P.C.Mourao, R.H.Saad, M.J.Togashi, M.Simeoni, L.A.Abdalla, D.S.Skaf, M.S.Polikparpov, I.Lima, M.C.Galdino, S.L.Brennan, R.G.Baxter, J.D.Pitta, I.R.Webb, P.Phillips, K.J.Neves, F.A.

(2012) J.Biol.Chem. 287: 28169-28179

  • DOI: 10.1074/jbc.M111.332106

  • PubMed Abstract: 
  • The recent discovery that peroxisome proliferator-activated receptor γ (PPARγ) targeted anti-diabetic drugs function by inhibiting Cdk5-mediated phosphorylation of the receptor has provided a new viewpoint to evaluate and perhaps develop improved ins ...

    The recent discovery that peroxisome proliferator-activated receptor γ (PPARγ) targeted anti-diabetic drugs function by inhibiting Cdk5-mediated phosphorylation of the receptor has provided a new viewpoint to evaluate and perhaps develop improved insulin-sensitizing agents. Herein we report the development of a novel thiazolidinedione that retains similar anti-diabetic efficacy as rosiglitazone in mice yet does not elicit weight gain or edema, common side effects associated with full PPARγ activation. Further characterization of this compound shows GQ-16 to be an effective inhibitor of Cdk5-mediated phosphorylation of PPARγ. The structure of GQ-16 bound to PPARγ demonstrates that the compound utilizes a binding mode distinct from other reported PPARγ ligands, although it does share some structural features with other partial agonists, such as MRL-24 and PA-082, that have similarly been reported to dissociate insulin sensitization from weight gain. Hydrogen/deuterium exchange studies reveal that GQ-16 strongly stabilizes the β-sheet region of the receptor, presumably explaining the compound's efficacy in inhibiting Cdk5-mediated phosphorylation of Ser-273. Molecular dynamics simulations suggest that the partial agonist activity of GQ-16 results from the compound's weak ability to stabilize helix 12 in its active conformation. Our results suggest that the emerging model, whereby "ideal" PPARγ-based therapeutics stabilize the β-sheet/Ser-273 region and inhibit Cdk5-mediated phosphorylation while minimally invoking adipogenesis and classical agonism, is indeed a valid framework to develop improved PPARγ modulators that retain antidiabetic actions while minimizing untoward effects.


    Organizational Affiliation

    Laboratório de Farmacologia Molecular, Departamento de Ciências Farmacêuticas, Faculdade de Ciências da Saúde, Universidade de Brasília, 70919-970 Brazil.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Peroxisome proliferator-activated receptor gamma
A, B
284Homo sapiensMutation(s): 0 
Gene Names: PPARG (NR1C3)
Find proteins for P37231 (Homo sapiens)
Go to Gene View: PPARG
Go to UniProtKB:  P37231
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Nuclear receptor coactivator 1
C, D
18Homo sapiensMutation(s): 0 
Gene Names: NCOA1 (BHLHE74, SRC1)
EC: 2.3.1.48
Find proteins for Q15788 (Homo sapiens)
Go to Gene View: NCOA1
Go to UniProtKB:  Q15788
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3T0
Query on 3T0

Download SDF File 
Download CCD File 
A, B
(5Z)-5-(5-bromo-2-methoxybenzylidene)-3-(4-methylbenzyl)-1,3-thiazolidine-2,4-dione
C19 H16 Br N O3 S
AMLZLORVKZAHOH-YVLHZVERSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
3T0Ki: 160 nM BINDINGMOAD
3T0Ki: 160 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 83.690α = 90.00
b = 84.390β = 90.00
c = 96.980γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
ADSCdata collection
PHENIXrefinement
PHASERphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Database references