Structure-guided reprogramming of human cGAS dinucleotide linkage specificity.

Structure-guided reprogramming of human cGAS dinucleotide linkage specificity.
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DOI:
10.1016/j.cell.2014.07.028
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发表时间:
2014-08-28
期刊:
影响因子:
64.5
通讯作者:
Doudna JA
Doudna JA
中科院分区:
生物学1区
文献类型:
--
作者:
Kranzusch PJ;Lee ASY;Wilson SC;Solovykh MS;Vance RE;Berger JM;Doudna JA

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Cyclic dinucleotides (CDNs) play central roles in bacterial pathogenesis and innate immunity. The mammalian enzyme cGAS synthesizes a unique cyclic dinucleotide (cGAMP) containing a 2′-5′ phosphodiester linkage essential for optimal immune stimulation, but the molecular basis for linkage specificity is unknown. Here we show that the Vibrio cholerae pathogenicity factor DncV is a prokaryotic cGAS-like enzyme whose activity provides a mechanistic rationale for the unique ability of cGAS to produce 2′-5′ cGAMP. Three high-resolution crystal structures show that DncV and human cGAS generate CDNs in sequential reactions that proceed in opposing directions. We explain 2′ and 3′ linkage specificity, and test this model by reprogramming the human cGAS active site to produce 3′-5′ cGAMP, leading to selective stimulation of alternative STING adaptor alleles in cells. These results demonstrate mechanistic homology between bacterial signaling and mammalian innate immunity and explain how active site configuration controls linkage chemistry for pathway-specific signaling.
DOI: 10.1038/nature12305
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影响因子: 64.8
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