5V8O

Discovery of a high affinity inhibitor of cGAS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Discovery of PF-06928215 as a high affinity inhibitor of cGAS enabled by a novel fluorescence polarization assay.

Hall, J.Brault, A.Vincent, F.Weng, S.Wang, H.Dumlao, D.Aulabaugh, A.Aivazian, D.Castro, D.Chen, M.Culp, J.Dower, K.Gardner, J.Hawrylik, S.Golenbock, D.Hepworth, D.Horn, M.Jones, L.Jones, P.Latz, E.Li, J.Lin, L.L.Lin, W.Lin, D.Lovering, F.Niljanskul, N.Nistler, R.Pierce, B.Plotnikova, O.Schmitt, D.Shanker, S.Smith, J.Snyder, W.Subashi, T.Trujillo, J.Tyminski, E.Wang, G.Wong, J.Lefker, B.Dakin, L.Leach, K.

(2017) PLoS ONE 12: e0184843-e0184843

  • DOI: 10.1371/journal.pone.0184843
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cyclic GMP-AMP synthase (cGAS) initiates the innate immune system in response to cytosolic dsDNA. After binding and activation from dsDNA, cGAS uses ATP and GTP to synthesize 2', 3' -cGAMP (cGAMP), a cyclic dinucleotide second messenger with mixed 2' ...

    Cyclic GMP-AMP synthase (cGAS) initiates the innate immune system in response to cytosolic dsDNA. After binding and activation from dsDNA, cGAS uses ATP and GTP to synthesize 2', 3' -cGAMP (cGAMP), a cyclic dinucleotide second messenger with mixed 2'-5' and 3'-5' phosphodiester bonds. Inappropriate stimulation of cGAS has been implicated in autoimmune disease such as systemic lupus erythematosus, thus inhibition of cGAS may be of therapeutic benefit in some diseases; however, the size and polarity of the cGAS active site makes it a challenging target for the development of conventional substrate-competitive inhibitors. We report here the development of a high affinity (KD = 200 nM) inhibitor from a low affinity fragment hit with supporting biochemical and structural data showing these molecules bind to the cGAS active site. We also report a new high throughput cGAS fluorescence polarization (FP)-based assay to enable the rapid identification and optimization of cGAS inhibitors. This FP assay uses Cy5-labelled cGAMP in combination with a novel high affinity monoclonal antibody that specifically recognizes cGAMP with no cross reactivity to cAMP, cGMP, ATP, or GTP. Given its role in the innate immune response, cGAS is a promising therapeutic target for autoinflammatory disease. Our results demonstrate its druggability, provide a high affinity tool compound, and establish a high throughput assay for the identification of next generation cGAS inhibitors.


    Organizational Affiliation

    Medicine Design, Pfizer, Groton, Connecticut, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic GMP-AMP synthase
A, B
362Homo sapiensMutation(s): 0 
Gene Names: CGAS (C6orf150, MB21D1)
EC: 2.7.7.86
Find proteins for Q8N884 (Homo sapiens)
Go to UniProtKB:  Q8N884
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
8ZM
Query on 8ZM

Download SDF File 
Download CCD File 
A, B
5-phenyltetrazolo[1,5-a]pyrimidin-7-ol
C10 H7 N5 O
ZEMGYOQXYFNSGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.224 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 216.729α = 90.00
b = 48.060β = 110.65
c = 89.488γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
REFMACphasing
Aimlessdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2017-03-22 
  • Released Date: 2017-09-27 
  • Deposition Author(s): Hall, J.

Revision History 

  • Version 1.0: 2017-09-27
    Type: Initial release
  • Version 1.1: 2017-10-04
    Type: Database references