The molecular basis of tight nuclear tethering and inactivation of cGAS
Open accessAbstract
Nucleic acids derived from pathogens induce potent innate immune responses1–6. Cyclic GMP–AMP synthase (cGAS) is a double-stranded DNA sensor that catalyses the synthesis of the cyclic dinucleotide cyclic GMP–AMP, which mediates the induction of type I interferons through the STING–TBK1–IRF3 signalling axis7–11. cGAS was previously thought to not react with self DNA owing to its cytosolic localization2,12,13; however, recent studies have shown that cGAS is localized mostly in the nucleus and has low activity as a result of tight nuclear tethering14–18. Here we show that cGAS binds to nucleosomes with nanomolar affinity and that nucleosome binding potently inhibits its catalytic activity. To elucidate the molecular basis of cGAS inactivation by nuclear tethering, we determined the structure of mouse cGAS bound to human nucleosome by cryo-electron microscopy. The structure shows that cGAS binds to a negatively charged acidic patch formed by histones H2A and H2B via its second DNA-binding site19. High-affinity nucleosome binding blocks double-stranded DNA binding and maintains cGAS in an inactive conformation. Mutations of cGAS that disrupt nucleosome binding alter cGAS-mediated signalling in cells. Structural studies show that cyclic GMP–AMP synthase binds to nucleosomes through its DNA-binding site, which maintains it in an inactive conformation and prevents self-DNA binding.
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cGAS is suppressed by binding to nucleosomes and disruption of nucleosome regulation enables robust DNA-dependent activation of cGAS.
“Previously, we and others showed that cGAS is suppressed by binding to nucleosomes and that disruption of nucleosome regulation enables robust DNA-dependent activation of cGAS32–37 (Fig. 4a).”
From cGAS–STING drives ageing-related inflammation and neurodegeneration (2023) · cites this paper as [34]
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- Authors
- Zhao, B., Xu, P., Rowlett, C. M., Jing, T., Shinde, O., Lei, Y., West, A. P., Liu, W. R., & Li, P.
- Affiliations
- Texas A&M University (US)
- Texas A&M Health Science Center (US)
- Corresponding author
- Liu, Wenshe Ray
- Li, Pingwei
- ORCID
- Venue
- Nature
- Published
- 2020-09-10
- Volume
- 587
- Issue
- 7835
- Pages
- 673-677
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC7704945
- OpenAlex
- W3083971280
- Semantic Scholar
- e3ee6a242101a668250c6be62a691a28b1ea9829
- Cited by
- 261
- References
- 23
- Citations by year
- 2026: 37 · 2025: 38 · 2024: 51 · 2023: 31 · 2022: 39 · 2021: 56 · 2020: 8 · 2013: 1
- FWCI
- 11.82
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- National Heart, Lung, and Blood Institute (R01HL148153)
- National Institute of General Medical Sciences (R01GM121584, R01GM127575)
- National Institute of Allergy and Infectious Diseases (R01AI145287)
- 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, nucleosome binding, nucleic acid sensing, type I interferon, double-stranded DNA binding, protein-DNA complex structure, innate immunity
- MeSH terms
- Cyclic Guanosine Monophosphate-Adenosine Monophosphate Synthase, Animals, Cell Line, DNA, Humans, Models, Molecular, Mutation, Nucleosomes, Nucleotidyltransferases, Protein Binding, Signal Transduction, Catalytic Domain, Cryoelectron Microscopy, Mice, Biocatalysis
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