4TXY

Crystal structure of Vibrio cholerae DncV cyclic AMP-GMP synthase, a prokaryotic cGAS homolog


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.0001 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure-Guided Reprogramming of Human cGAS Dinucleotide Linkage Specificity.

Kranzusch, P.J.Lee, A.S.Wilson, S.C.Solovykh, M.S.Vance, R.E.Berger, J.M.Doudna, J.A.

(2014) Cell 158: 1011-1021

  • DOI: 10.1016/j.cell.2014.07.028
  • Primary Citation of Related Structures:  4TXZ, 4TY0

  • PubMed Abstract: 
  • Cyclic dinucleotides (CDNs) play central roles in bacterial pathogenesis and innate immunity. The mammalian enzyme cGAS synthesizes a unique cyclic dinucleotide (cGAMP) containing a 2'-5' phosphodiester linkage essential for optimal immune stimulatio ...

    Cyclic dinucleotides (CDNs) play central roles in bacterial pathogenesis and innate immunity. The mammalian enzyme cGAS synthesizes a unique cyclic dinucleotide (cGAMP) containing a 2'-5' phosphodiester linkage essential for optimal immune stimulation, but the molecular basis for linkage specificity is unknown. Here, we show that the Vibrio cholerae pathogenicity factor DncV is a prokaryotic cGAS-like enzyme whose activity provides a mechanistic rationale for the unique ability of cGAS to produce 2'-5' cGAMP. Three high-resolution crystal structures show that DncV and human cGAS generate CDNs in sequential reactions that proceed in opposing directions. We explain 2' and 3' linkage specificity and test this model by reprogramming the human cGAS active site to produce 3'-5' cGAMP, leading to selective stimulation of alternative STING adaptor alleles in cells. These results demonstrate mechanistic homology between bacterial signaling and mammalian innate immunity and explain how active site configuration controls linkage chemistry for pathway-specific signaling.


    Organizational Affiliation

    Department of Molecular & Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA; Howard Hughes Medical Institute (HHMI), University of California, Berkeley, Berkeley, CA 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyclic AMP-GMP synthase
A, B
413Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Gene Names: dncV
EC: 2.7.7.-
Find proteins for Q9KVG7 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  Q9KVG7
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.0001 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 70.167α = 90.00
b = 59.116β = 95.48
c = 102.539γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
Howard Hughes Medical InstituteUnited States--
G. Harold and Leila Y. Mathers FoundationUnited States--

Revision History 

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-09-03
    Type: Database references
  • Version 1.2: 2014-10-01
    Type: Database references
  • Version 1.3: 2015-02-04
    Type: Derived calculations