4JLX | pdb_00004jlx

Structure of porcine cyclic GMP-AMP synthase (cGAS)

• PDB DOI: https://doi.org/10.2210/pdb4JLX/pdb

• Classification: DNA BINDING PROTEIN
• Organism(s): Sus scrofa
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-03-13 Released: 2013-06-12 
• Deposition Author(s): Civril, F., Hopfner, K.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 
  0.215 (Depositor), 0.222 (DCC) 
• R-Value Work: 
  0.188 (Depositor), 0.197 (DCC) 
• R-Value Observed: 
  0.189 (Depositor) 

Literature

Structural mechanism of cytosolic DNA sensing by cGAS

Civril, F., Deimling, T., Mann, C.C.O., Ablasser, A., Moldt, M., Witte, G., Hornung, V., Hopfner, K.P.

(2013) Nature 498: 332-337

• PubMed: 23722159 
• DOI: https://doi.org/10.1038/nature12305
• Primary Citation Related Structures: 
  4JLX, 4JLZ, 4KB6


• PubMed Abstract: 
  

  Cytosolic DNA arising from intracellular bacterial or viral infections is a powerful pathogen-associated molecular pattern (PAMP) that leads to innate immune host defence by the production of type I interferon and inflammatory cytokines. Recognition of cytosolic DNA by the recently discovered cyclic-GMP-AMP (cGAMP) synthase (cGAS) induces the production of cGAMP to activate the stimulator of interferon genes (STING). Here we report the crystal structure of cGAS alone and in complex with DNA, ATP and GTP along with functional studies. Our results explain the broad DNA sensing specificity of cGAS, show how cGAS catalyses dinucleotide formation and indicate activation by a DNA-induced structural switch. cGAS possesses a remarkable structural similarity to the antiviral cytosolic double-stranded RNA sensor 2'-5'oligoadenylate synthase (OAS1), but contains a unique zinc thumb that recognizes B-form double-stranded DNA. Our results mechanistically unify dsRNA and dsDNA innate immune sensing by OAS1 and cGAS nucleotidyl transferases.

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Organizational Affiliation: 
• Department of Biochemistry and Gene Center, Ludwig-Maximilians-University, 81377 Munich, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 43.32 kDa 
• Atom Count: 3,058 
• Modeled Residue Count: 351 
• Deposited Residue Count: 366 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Uncharacterized protein	A	366	Sus scrofa	Mutation(s): 0  Gene Names: MB21D1 EC: 2.7.7.86
UniProt
Find proteins for I3LM39 (Sus scrofa) Explore I3LM39  Go to UniProtKB:  I3LM39

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PG4	F [auth A], H [auth A]	TETRAETHYLENE GLYCOL C8 H18 O5 UWHCKJMYHZGTIT-UHFFFAOYSA-N
MLI	C [auth A], E [auth A], G [auth A]	MALONATE ION C3 H2 O4 OFOBLEOULBTSOW-UHFFFAOYSA-L
GOL	D [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free:  0.215 (Depositor), 0.222 (DCC) 
• R-Value Work:  0.188 (Depositor), 0.197 (DCC) 
• R-Value Observed: 0.189 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.402	α = 90
b = 118.014	β = 90
c = 142.599	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-06-12 
Deposition Author(s): Civril, F., Hopfner, K.P.

Revision History  

• Version 1.0: 2013-06-12
  Type: Initial release
  
• Version 1.1: 2013-07-10
  Changes: Database references
• Version 1.2: 2024-03-20
  Changes: Data collection, Database references, Derived calculations