Structure of human cGAS reveals a conserved family of second-messenger enzymes in innate immunity.
Structure of human cGAS reveals a conserved family of second-messenger enzymes in innate immunity.
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DOI:
10.1016/j.celrep.2013.05.008
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发表时间:
2013-05-30
期刊:
影响因子:
8.8
通讯作者:
Doudna JA
中科院分区:
文献类型:
--
作者:
Kranzusch PJ;Lee AS;Berger JM;Doudna JA
Innate immune recognition of foreign nucleic acids induces protective interferon responses. Detection of cytosolic DNA triggers downstream immune signaling through activation of cyclic GMP–AMP synthase (cGAS). We report here the crystal structure of human cGAS, revealing an unanticipated zinc-ribbon DNA-binding domain appended to a core enzymatic nucleotidyl transferase scaffold. The catalytic core of cGAS is structurally homologous to the RNA sensing enzyme, 2′–5′ oligo-adenylate synthase (OAS), and divergent C-terminal domains account for specific ligand-activation requirements of each enzyme. We show that the cGAS zinc-ribbon is essential for STING-dependent induction of the interferon response, and conserved amino acids displayed within the intervening loops are required for efficient cytosolic DNA recognition. These results demonstrate that cGAS and OAS define a new family of innate immunity sensors, and that structural divergence from a core nucleotidyl transferase enables second-messenger responses to distinct foreign nucleic acids.
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DOI:
10.1126/science.1229963
发表时间:
2013-02-15
期刊:
Science (New York, N.Y.)
影响因子:
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