Cited by 1,695interferon and immune responsesDNA and Nucleic Acid ChemistryImmune Response and Inflammation

CGAS produces a 2′-5′-linked cyclic dinucleotide second messenger that activates STING.

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Ablasser, Andrea, Goldeck, Marion, Cavlar, Taner, Deimling, Tobias, Witte, Gregor, Röhl, Ingo, Hopfner, Karl-Peter, Ludwig, Janos +1 more·2013·Nature

Abstract

Detection of cytoplasmic DNA represents one of the most fundamental mechanisms of the innate immune system to sense the presence of microbial pathogens. Moreover, erroneous detection of endogenous DNA by the same sensing mechanisms has an important pathophysiological role in certain sterile inflammatory conditions. The endoplasmic-reticulum-resident protein STING is critically required for the initiation of type I interferon signalling upon detection of cytosolic DNA of both exogenous and endogenous origin. Next to its pivotal role in DNA sensing, STING also serves as a direct receptor for the detection of cyclic dinucleotides, which function as second messenger molecules in bacteria. DNA recognition, however, is triggered in an indirect fashion that depends on a recently characterized cytoplasmic nucleotidyl transferase, termed cGAMP synthase (cGAS), which upon interaction with DNA synthesizes a dinucleotide molecule that in turn binds to and activates STING. We here show in vivo and in vitro that the cGAS-catalysed reaction product is distinct from previously characterized cyclic dinucleotides. Using a combinatorial approach based on mass spectrometry, enzymatic digestion, NMR analysis and chemical synthesis we demonstrate that cGAS produces a cyclic GMP-AMP dinucleotide, which comprises a 2'-5' and a 3'-5' phosphodiester linkage >Gp(2'-5')Ap(3'-5')>. We found that the presence of this 2'-5' linkage was required to exert potent activation of human STING. Moreover, we show that cGAS first catalyses the synthesis of a linear 2'-5'-linked dinucleotide, which is then subject to cGAS-dependent cyclization in a second step through a 3'-5' phosphodiester linkage. This 13-membered ring structure defines a novel class of second messenger molecules, extending the family of 2'-5'-linked antiviral biomolecules.

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Authors
Ablasser, A., Goldeck, M., Cavlar, T., Deimling, T., Witte, G., Röhl, I., Hopfner, K.-P., Ludwig, J., & Hornung, V.
Affiliations
  • University of Bonn (DE)
  • Ludwig-Maximilians-Universität München (DE)
  • Center for Integrated Protein Science Munich (DE)
Corresponding author
  • Ablasser, Andrea
  • Hornung, Veit
Venue
Nature
Published
2013-05-30
Volume
498
Issue
7454
Pages
380-384
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1559117436
Cited by
1,695
References
24
Citations by year
2026: 171 · 2025: 175 · 2024: 196 · 2023: 162 · 2022: 181 · 2021: 168 · 2020: 152 · 2019: 97 · 2018: 82 · 2017: 84 · 2016: 59 · 2015: 74 · 2014: 63 · 2013: 31
FWCI
41.88
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
National Institute of Allergy and Infectious Diseases (U19AI083025)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
cGAS, STING, cyclic dinucleotides, 2'-5' linkage, type I interferon, cytosolic DNA sensing, innate immunity, crystal structure, second messengers, sterile inflammation, autoimmune disease, cGAS inhibitors
MeSH terms
STING Protein, Cyclic Guanosine Monophosphate-Adenosine Monophosphate Synthase, Adenosine Monophosphate, Animals, Cell Line, Cyclization, Cyclic GMP, Humans, Membrane Proteins, Models, Molecular, Magnetic Resonance Spectroscopy, Nucleotidyltransferases, Oligoribonucleotides, Second Messenger Systems, Molecular Structure, Mice, Biocatalysis, HEK293 Cells

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