Cited by 1,101interferon and immune responsesPhosphodiesterase function and regulationDNA and Nucleic Acid Chemistry

Cyclic [G(2′,5′)pA(3′,5′)p] is the metazoan second messenger produced by DNA-activated cyclic GMP-AMP synthase.

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Gao, Pu, Ascano, Manuel, Wu, Yang, Barchet, Winfried, Gaffney, Barbara L., Zillinger, Thomas, Serganov, Artem A., Liu, Yizhou +4 more·2013·Cell

Abstract

Recent studies identified cyclic GMP-AMP (cGAMP) as a metazoan second messenger triggering an interferon response. cGAMP is generated from GTP and ATP by cytoplasmic dsDNA sensor cGAMP synthase (cGAS). We combined structural, chemical, biochemical, and cellular assays to demonstrate that this second messenger contains G(2',5')pA and A(3',5')pG phosphodiester linkages, designated c[G(2',5')pA(3',5')p]. We show that, upon dsDNA binding, cGAS is activated through conformational transitions, resulting in formation of a catalytically competent and accessible nucleotide-binding pocket for generation of c[G(2',5')pA(3',5')p]. We demonstrate that cyclization occurs in a stepwise manner through initial generation of 5'-pppG(2',5')pA prior to cyclization to c[G(2',5')pA(3',5')p], with the latter positioned precisely in the catalytic pocket. Mutants of cGAS dsDNA-binding or catalytic pocket residues exhibit reduced or abrogated activity. Our studies have identified c[G(2',5')pA(3',5')p] as a founding member of a family of metazoan 2',5'-containing cyclic heterodinucleotide second messengers distinct from bacterial 3',5' cyclic dinucleotides.

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Authors
Gao, P., Ascano, M., Wu, Y., Barchet, W., Gaffney, B. L., Zillinger, T., Serganov, A. A., Liu, Y., Jones, R. A., Hartmann, G., Tuschl, T., & Patel, D. J.
Affiliations
  • Memorial Sloan Kettering Cancer Center (US)
  • Howard Hughes Medical Institute (US)
  • University of Bonn (DE)
  • Rutgers, The State University of New Jersey (US)
Corresponding author
  • Tuschl, Thomas
  • Patel, Dinshaw J.
Venue
Cell
Publisher
Elsevier BV
Published
2013-05
Volume
153
Issue
5
Pages
1094-1107
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2123645680
Cited by
1,101
References
43
Citations by year
2026: 95 · 2025: 122 · 2024: 118 · 2023: 106 · 2022: 112 · 2021: 105 · 2020: 92 · 2019: 76 · 2018: 43 · 2017: 59 · 2016: 48 · 2015: 47 · 2014: 45 · 2013: 33
FWCI
31.89
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (P30CA008748)
  • National Institute of General Medical Sciences (R01GM079760, GM79760)
  • Argonne National Laboratory
  • Brookhaven National Laboratory
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Phosphodiesterase function and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
Keywords
cyclic GMP-AMP, cGAMP, cGAS, interferon response, conformational activation, catalytic pocket, nucleotide-binding pocket
MeSH terms
Cyclic Guanosine Monophosphate-Adenosine Monophosphate Synthase, Adenosine Triphosphate, Amino Acid Sequence, Animals, DNA, Guanosine Triphosphate, Humans, Models, Chemical, Models, Molecular, Molecular Sequence Data, Nucleotides, Cyclic, Nucleotidyltransferases, 2',5'-Oligoadenylate Synthetase, Dinucleoside Phosphates, Second Messenger Systems, Sequence Alignment, Crystallography, X-Ray, Mice

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