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- W2069651362 abstract "Cyclic dinucleotides act as intracellular second messengers, modulating a variety of cellular activities including innate immune activation. Although phosphodiesterases (PDEs) hydrolyzing c-di-GMP and c-di-AMP have been identified, no PDEs for cGAMPs have been reported. Here we identified the first three cGAMP-specific PDEs in V. cholerae (herein designated as V-cGAP1/2/3). V-cGAPs are HD-GYP domain-containing proteins and specifically break 3′3′-cGAMP, but not other forms of cGAMP. 3′3′-cGAMP is first linearized by all three V-cGAPs to produce 5′-pApG, which is further hydrolyzed into 5′-ApG by V-cGAP1. In this two-step reaction, V-cGAP1 functions as both a PDE and a 5′-nucleotidase. In vivo experiments demonstrated that V-cGAPs play non-redundant roles in cGAMP degradation. The high specificity of V-cGAPs on 3′3′-cGAMP suggests the existence of specific PDEs for other cGAMPs, including 2′3′-cGAMP in mammalian cells. The absolute requirement of the GYP motif for 3′3′-cGAMP degradation suggests that HD domain-containing PDEs in eukaryotes are probably unable to hydrolyze cGAMPs. The fact that all V-cGAPs attack 3′3′-cGAMP on one specific phosphodiester bond suggests that PDEs for other cGAMPs would utilize a similar strategy. These results will provide valuable information for identification and characterization of mammalian 2′3′-cGAMP-specific PDEs in future studies." @default.
- W2069651362 created "2016-06-24" @default.
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- W2069651362 date "2015-04-03" @default.
- W2069651362 modified "2023-10-07" @default.
- W2069651362 title "Identification and characterization of phosphodiesterases that specifically degrade 3′3′-cyclic GMP-AMP" @default.
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- W2069651362 doi "https://doi.org/10.1038/cr.2015.40" @default.
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