Article ; Online: The allosteric activation of cGAS underpins its dynamic signaling landscape.
2018 Volume 7
Abstract: Cyclic G/AMP synthase (cGAS) initiates type-1 interferon responses against cytosolic double-stranded (ds)DNA, which range from antiviral gene expression to apoptosis. The mechanism by which cGAS shapes this diverse signaling landscape remains poorly ... ...
Abstract | Cyclic G/AMP synthase (cGAS) initiates type-1 interferon responses against cytosolic double-stranded (ds)DNA, which range from antiviral gene expression to apoptosis. The mechanism by which cGAS shapes this diverse signaling landscape remains poorly defined. We find that substrate-binding and dsDNA length-dependent binding are coupled to the intrinsic dimerization equilibrium of cGAS, with its N-terminal domain potentiating dimerization. Notably, increasing the dimeric fraction by raising cGAS and substrate concentrations diminishes duplex length-dependent activation, but does not negate the requirement for dsDNA. These results demonstrate that reaction context dictates the duplex length dependence, reconciling competing claims on the role of dsDNA length in cGAS activation. Overall, our study reveals how ligand-mediated allostery positions cGAS in standby, ready to tune its signaling pathway in a switch-like fashion. |
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MeSH term(s) | Allosteric Regulation ; Biophysical Phenomena ; DNA/metabolism ; Humans ; Kinetics ; Nucleotidyltransferases/chemistry ; Nucleotidyltransferases/metabolism ; Protein Domains ; Protein Multimerization ; Signal Transduction ; Substrate Specificity |
Chemical Substances | DNA (9007-49-2) ; Nucleotidyltransferases (EC 2.7.7.-) ; cGAS protein, human (EC 2.7.7.-) |
Language | English |
Publishing date | 2018-10-08 |
Publishing country | England |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2687154-3 |
ISSN | 2050-084X ; 2050-084X |
ISSN (online) | 2050-084X |
ISSN | 2050-084X |
DOI | 10.7554/eLife.39984 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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