6LRI

Human cGAS catalytic domain bound with compound 17


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 

wwPDB Validation 3D Report Full Report



Literature

In Silico Screening-Based Discovery of Novel Inhibitors of Human Cyclic GMP-AMP Synthase: A Cross-Validation Study of Molecular Docking and Experimental Testing.

Zhao, W.F.Xiong, M.Y.Yuan, X.J.Li, M.J.Sun, H.B.Xu, Y.C.

(2020) J Chem Inf Model 

  • DOI: 10.1021/acs.jcim.0c00171
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Cyclic GMP-AMP synthase (cGAS) has been recently uncovered to be a promising therapeutic target for immune-associated diseases. Until now, only a few inhibitors have been identified through high-throughput screening campaigns. Here, we reported the d ...

    Cyclic GMP-AMP synthase (cGAS) has been recently uncovered to be a promising therapeutic target for immune-associated diseases. Until now, only a few inhibitors have been identified through high-throughput screening campaigns. Here, we reported the discovery of novel inhibitors for the catalytic domain of human cGAS (h-cGAS CD ) by virtual screening for the first time. To generate a reliable docking mode, we first obtained a high-resolution crystal structure of h-cGAS CD in complex with PF-06928215, a known inhibitor of h-cGAS, followed by molecular dynamics simulations on this complex structure. Four fragment hits were identified by the virtual screening together with a thermal shift assay. The crystal structures of these four compounds in complex with h-cGAS CD were subsequently determined, and the binding modes of the compounds were similar to those predicted by molecular docking, supporting the reliability of the docking model. In addition, an enzyme activity assay identified compound 18 (IC 50 = 29.88 ± 3.20 μM) from the compounds predicted by the virtual screening. A similarity search of compound 18 followed by a second virtual screening led to the discovery of compounds S2 (IC 50 = 13.1 ± 0.09 μM) and S3 (IC 50 = 4.9 ± 0.26 μM) as h-cGAS inhibitors with improved potency. Therefore, the present study not only provides the validated hit compounds for further development of h-cGAS inhibitors but also demonstrates a cross-validation study of virtual screening, in vitro experimental assays, and crystal structure determination.


    Organizational Affiliation

    University of Chinese Academy of Sciences, Beijing 100049, China.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic GMP-AMP synthase
A, B
366Homo sapiensMutation(s): 0 
Gene Names: CGASC6orf150MB21D1
EC: 2.7.7.86
Find proteins for Q8N884 (Homo sapiens)
Go to UniProtKB:  Q8N884
NIH Common Fund Data Resources
PHAROS  Q8N884
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EQR
Query on EQR

Download CCD File 
A, B
3-[5-(2-hydroxy-2-oxoethyl)-3-oxidanylidene-[1,2,4]triazino[2,3-a]benzimidazol-2-yl]propanoic acid
C14 H12 N4 O5
IBSCUNBMGSFHGD-UHFFFAOYSA-N
 Ligand Interaction
ZN
Query on ZN

Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.238 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 216.15α = 90
b = 48.292β = 112.25
c = 88.999γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China81620108027
National Natural Science Foundation of China (NSFC)China21632008

Revision History 

  • Version 1.0: 2020-06-24
    Type: Initial release