4ley

From Proteopedia

(Difference between revisions)

Revision as of 18:03, 5 August 2016

Structure of mouse cGAS bound to 18 bp DNA

Structural highlights

4ley is a 12 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	4lev, 4lew, 4lez
Gene:	Mb21d1 (LK3 transgenic mice)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[CGAS_MOUSE] Nucleotidyltransferase that catalyzes formation of cyclic GMP-AMP (cGAMP) from ATP and GTP and exhibits antiviral activity. Has antiviral activity by acting as a key cytosolic DNA sensor, the presence of DNA in the cytoplasm being a danger signal that triggers the immune responses. Binds cytosolic DNA directly, leading to activation and synthesis of cGAMP, a second messenger that binds to and activates TMEM173/STING, thereby triggering type-I interferon production.

Publication Abstract from PubMed

Cyclic GMP-AMP synthase (cGAS) is a cytosolic DNA sensor mediating innate antimicrobial immunity. It catalyzes the synthesis of a noncanonical cyclic dinucleotide, 2',5' cGAMP, that binds to STING and mediates the activation of TBK1 and IRF-3. Activated IRF-3 translocates to the nucleus and initiates the transcription of the IFN-beta gene. The structure of mouse cGAS bound to an 18 bp dsDNA revealed that cGAS interacts with dsDNA through two binding sites, forming a 2:2 complex. Enzyme assays and IFN-beta reporter assays of cGAS mutants demonstrated that interactions at both DNA binding sites are essential for cGAS activation. Mutagenesis and DNA binding studies showed that the two sites bind dsDNA cooperatively and that site B plays a critical role in DNA binding. The structure of mouse cGAS bound to dsDNA and 2',5' cGAMP provided insight into the catalytic mechanism of cGAS. These results demonstrated that cGAS is activated by dsDNA-induced oligomerization.

Cyclic GMP-AMP Synthase Is Activated by Double-Stranded DNA-Induced Oligomerization.,Li X, Shu C, Yi G, Chaton CT, Shelton CL, Diao J, Zuo X, Kao CC, Herr AB, Li P Immunity. 2013 Dec 12;39(6):1019-31. doi: 10.1016/j.immuni.2013.10.019. PMID:24332030^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Li X, Shu C, Yi G, Chaton CT, Shelton CL, Diao J, Zuo X, Kao CC, Herr AB, Li P. Cyclic GMP-AMP Synthase Is Activated by Double-Stranded DNA-Induced Oligomerization. Immunity. 2013 Dec 12;39(6):1019-31. doi: 10.1016/j.immuni.2013.10.019. PMID:24332030 doi:http://dx.doi.org/10.1016/j.immuni.2013.10.019

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4ley"

Categories: Lk3 transgenic mice | Li, P | Dna sensor | Ntase | Transferase-dna complex

@@ Line 1: / Line 1: @@
 ==Structure of mouse cGAS bound to 18 bp DNA==
 <StructureSection load='4ley' size='340' side='right' caption='[[4ley]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4lev|4lev]], [[4lew|4lew]], [[4lez|4lez]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Mb21d1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ley FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ley OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4ley RCSB], [http://www.ebi.ac.uk/pdbsum/4ley PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ley FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ley OCA], [http://pdbe.org/4ley PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ley RCSB], [http://www.ebi.ac.uk/pdbsum/4ley PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ley ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4ley" style="background-color:#fffaf0;"></div>
 ==See Also==

4ley

From Proteopedia

Revision as of 18:03, 5 August 2016

Structure of mouse cGAS bound to 18 bp DNA

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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