Biology:Cyclic GMP-AMP synthase

From HandWiki
Short description: Cytosolic DNA sensor
CGAS complexed with dsDNA.png
cGAS complexed with dsDNA (based on PDB 4O6A)
Identifiers
EC number2.7.7.86
Databases
IntEnzIntEnz view
BRENDABRENDA entry
ExPASyNiceZyme view
KEGGKEGG entry
MetaCycmetabolic pathway
PRIAMprofile
PDB structuresRCSB PDB PDBe PDBsum
cGAS dimer, human
cGAS-cGAMP-STING pathway

Cyclic GMP-AMP synthase (cGAS, cGAMP synthase), belonging to the nucleotidyltransferase family, is a cytosolic DNA sensor that activates a type-I interferon response. It is part of the cGAS-STING DNA sensing pathway. It binds to microbial DNA as well as self DNA that invades the cytoplasm, and catalyzes cGAMP synthesis.[1] cGAMP then functions as a second messenger that binds to and activates the endoplasmic reticulum protein STING to trigger type-I IFNs production.[2][3][4] Mice lacking cGAS are more vulnerable to lethal infection by DNA viruses and RNA viruses.[5][6] In addition, cGAS has been shown to be an innate immune sensor of retroviruses including HIV.[7][8] The human gene encoding cGAS is MB21D1 on chromosome 6.

References

  1. "Cyclic GMP-AMP synthase is a cytosolic DNA sensor that activates the type I interferon pathway". Science 339 (6121): 786–91. February 2013. doi:10.1126/science.1232458. PMID 23258413. Bibcode2013Sci...339..786S. 
  2. "Cyclic GMP-AMP is an endogenous second messenger in innate immune signaling by cytosolic DNA". Science 339 (6121): 826–30. February 2013. doi:10.1126/science.1229963. PMID 23258412. Bibcode2013Sci...339..826W. 
  3. "Cyclic [G(2',5')pA(3',5')p is the metazoan second messenger produced by DNA-activated cyclic GMP-AMP synthase"]. Cell 153 (5): 1094–107. May 2013. doi:10.1016/j.cell.2013.04.046. PMID 23647843. 
  4. "Cyclic GMP-AMP containing mixed phosphodiester linkages is an endogenous high-affinity ligand for STING". Molecular Cell 51 (2): 226–35. July 2013. doi:10.1016/j.molcel.2013.05.022. PMID 23747010. 
  5. "Pivotal roles of cGAS-cGAMP signaling in antiviral defense and immune adjuvant effects". Science 341 (6152): 1390–4. September 2013. doi:10.1126/science.1244040. PMID 23989956. Bibcode2013Sci...341.1390L. 
  6. "cGAS-STING effectively restricts murine norovirus infection but antagonizes the antiviral action of N-terminus of RIG-I in mouse macrophages.". Gut Microbes 13 (1): 1959839. January 2021. doi:10.1080/19490976.2021.1959839. PMID 34347572. 
  7. "Cyclic GMP-AMP synthase is an innate immune sensor of HIV and other retroviruses". Science 341 (6148): 903–6. August 2013. doi:10.1126/science.1240933. PMID 23929945. Bibcode2013Sci...341..903G. 
  8. "The capsids of HIV-1 and HIV-2 determine immune detection of the viral cDNA by the innate sensor cGAS in dendritic cells". Immunity 39 (6): 1132–42. December 2013. doi:10.1016/j.immuni.2013.11.002. PMID 24269171.