Structural mechanism of cytosolic DNA sensing by cGAS.
Structural mechanism of cytosolic DNA sensing by cGAS.
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Cytosolic DNA arising from intracellular bacteria or viral infections is a powerful pathogen-associated molecular pattern (PAMP) that leads to innate immune host defense by the production of type I interferon and inflammatory cytokines. Recognition of cytosolic DNA by the recently discovered cyclic-GMP-AMP (cGA) synthase (cGAS) induces the production of cGA to activate the stimulator of interferon genes (STING). Here we report the crystal structure of cGAS alone and in complex with DNA, ATP and GTP along with functional studies. Our results explain cGAS’ broad specificity DNA sensing, show how cGAS catalyzes di-nucleotide formation and indicate activation by a DNA-induced structural switch. cGAS possesses a remarkable structural similarity to the antiviral cytosolic dsRNA sensor 2’-5’oligoadenylate synthase (OAS1), but contains a unique zinc-thumb that recognizes B-form dsDNA. Our results mechanistically unify dsRNA and dsDNA innate immune sensing by OAS1 and cGAS nucleotidyl transferases.
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DOI:
10.1084/jem.20082874
发表时间:
2009-08-31
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
McWhirter SM;Barbalat R;Monroe KM;Fontana MF;Hyodo M;Joncker NT;Ishii KJ;Akira S;Colonna M;Chen ZJ;Fitzgerald KA;Hayakawa Y;Vance RE
通讯作者:
Vance RE
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
影响因子:
30.5
作者:
Buerckstuemmer, Tilmann;Baumann, Christoph;Superti-Furga, Giulio
通讯作者:
Superti-Furga, Giulio
影响因子:
11.4
作者:
Cavlar, Taner;Deimling, Tobias;Hornung, Veit
通讯作者:
Hornung, Veit
DOI:
10.1107/s0907444904016427
发表时间:
2004-12-01
影响因子:
2.2
作者:
Blanc, E;Roversi, P;Bricogne, G
通讯作者:
Bricogne, G