7n1s | pdb_00007n1s

Crystal Structure Analysis of Xac Nucleotide Pyrophosphatase/Phosphodiesterase

spinqualitylabelsall models 7n1s, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7n1s is a 2 chain structure with sequence from Xanthomonas citri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: PG4, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A7X9YQB3_XANCI Publication Abstract from PubMed The metazoan innate immune second messenger 2'3'-cGAMP is present both inside and outside cells. However, only extracellular cGAMP can be negatively regulated by the extracellular hydrolase ENPP1. Here, we determine whether ENPP1's regulation of extracellular cGAMP is a ubiquitous mechanism of attenuating stimulator of interferon genes (STING) signaling. We identified ENPP1H362A, a point mutation that cannot degrade the 2'-5' linkage in cGAMP while maintaining otherwise normal function. The selectivity of this histidine is conserved down to bacterial nucleotide pyrophosphatase/phosphodiesterase (NPP), allowing structural analysis and suggesting an unexplored ancient history of 2'-5' cyclic dinucleotides. Enpp1H362A mice demonstrated that extracellular cGAMP is not responsible for the devastating phenotype in ENPP1-null humans and mice but is responsible for antiviral immunity and systemic inflammation. Our data define extracellular cGAMP as a pivotal STING activator, identify an evolutionarily critical role for ENPP1 in regulating inflammation, and suggest a therapeutic strategy for viral and inflammatory conditions by manipulating ENPP1 activity. ENPP1's regulation of extracellular cGAMP is a ubiquitous mechanism of attenuating STING signaling.,Carozza JA, Cordova AF, Brown JA, AlSaif Y, Bohnert V, Cao X, Mardjuki RE, Skariah G, Fernandez D, Li L Proc Natl Acad Sci U S A. 2022 May 24;119(21):e2119189119. doi: , 10.1073/pnas.2119189119. Epub 2022 May 19. PMID:35588451 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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