Abstract:
:Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor mediating innate antimicrobial immunity. It catalyzes the synthesis of a noncanonical cyclic dinucleotide, 2',5' cGAMP, that binds to STING and mediates the activation of TBK1 and IRF-3. Activated IRF-3 translocates to the nucleus and initiates the transcription of the IFN-β gene. The structure of mouse cGAS bound to an 18 bp dsDNA revealed that cGAS interacts with dsDNA through two binding sites, forming a 2:2 complex. Enzyme assays and IFN-β reporter assays of cGAS mutants demonstrated that interactions at both DNA binding sites are essential for cGAS activation. Mutagenesis and DNA binding studies showed that the two sites bind dsDNA cooperatively and that site B plays a critical role in DNA binding. The structure of mouse cGAS bound to dsDNA and 2',5' cGAMP provided insight into the catalytic mechanism of cGAS. These results demonstrated that cGAS is activated by dsDNA-induced oligomerization.
journal_name
Immunityjournal_title
Immunityauthors
Li X,Shu C,Yi G,Chaton CT,Shelton CL,Diao J,Zuo X,Kao CC,Herr AB,Li Pdoi
10.1016/j.immuni.2013.10.019subject
Has Abstractpub_date
2013-12-12 00:00:00pages
1019-31issue
6eissn
1074-7613issn
1097-4180pii
S1074-7613(13)00510-4journal_volume
39pub_type
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