6LRJ

Human cGAS catalytic domain bound with compound 23


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


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.Xiong, M.Yuan, X.Li, M.Sun, H.Xu, Y.

(2020) J Chem Inf Model 60: 3265-3276

  • DOI: https://doi.org/10.1021/acs.jcim.0c00171
  • Primary Citation of Related Structures:  
    6LRC, 6LRE, 6LRI, 6LRJ, 6LRK, 6LRL

  • 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 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

    Jiangsu Key Laboratory of Drug Discovery for Metabolic Disease and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, P.R. China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cyclic GMP-AMP synthase
A, B
366Homo sapiensMutation(s): 0 
Gene Names: CGASC6orf150MB21D1
EC: 2.7.7.86
UniProt & NIH Common Fund Data Resources
Find proteins for Q8N884 (Homo sapiens)
Explore Q8N884 
Go to UniProtKB:  Q8N884
PHAROS:  Q8N884
GTEx:  ENSG00000164430 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8N884
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.210 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 214.825α = 90
b = 47.072β = 113.55
c = 87.02γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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  (Full details and data files)

  • Version 1.0: 2020-06-24
    Type: Initial release
  • Version 1.1: 2021-08-11
    Changes: Database references
  • Version 1.2: 2021-10-13
    Changes: Database references
  • Version 1.3: 2023-11-29
    Changes: Data collection, Refinement description