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| | <StructureSection load='6vm5' size='340' side='right'caption='[[6vm5]], [[Resolution|resolution]] 2.35Å' scene=''> | | <StructureSection load='6vm5' size='340' side='right'caption='[[6vm5]], [[Resolution|resolution]] 2.35Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6vm5]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_19976 Atcc 19976]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6VM5 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6VM5 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6vm5]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Moraxella_osloensis Moraxella osloensis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6VM5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6VM5 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.35Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">FEF33_11620, MOTT16_09860 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=34062 ATCC 19976])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6vm5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6vm5 OCA], [http://pdbe.org/6vm5 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6vm5 RCSB], [http://www.ebi.ac.uk/pdbsum/6vm5 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6vm5 ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6vm5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6vm5 OCA], [https://pdbe.org/6vm5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6vm5 RCSB], [https://www.ebi.ac.uk/pdbsum/6vm5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6vm5 ProSAT]</span></td></tr> |
| | </table> | | </table> |
| - | <div style="background-color:#fffaf0;">
| + | == Function == |
| - | == Publication Abstract from PubMed == | + | [https://www.uniprot.org/uniprot/CAP4_MOROS CAP4_MOROS] CBASS (cyclic oligonucleotide-based antiphage signaling system) provides immunity against bacteriophage. The CD-NTase protein synthesizes cyclic nucleotides in response to infection; these serve as specific second messenger signals. The signals activate a diverse range of effectors, leading to bacterial cell death and thus abortive phage infection (Probable). A type II-C CBASS system (PubMed:32839535).<ref>PMID:32839535</ref> <ref>PMID:32544385</ref> Probably in the presence of its endogenous cyclic nucleotide (synthesized by the cognate CD-NTase protein in the CBASS operon), or of 2',3',3'-cyclic AMP-AMP-AMP (cAAA) synthesized by Acinetobacter sp. ATCC 27244, endonucleolytically degrades dsDNA in a non-sequence specific manner. It is not activated by other cyclic nucleotides.<ref>PMID:32544385</ref> |
| - | cGAS/DncV-like nucleotidyltransferase (CD-NTase) enzymes are immune sensors that synthesize nucleotide second messengers and initiate antiviral responses in bacterial and animal cells. Here, we discover Enterobacter cloacae CD-NTase-associated protein 4 (Cap4) as a founding member of a diverse family of >2,000 bacterial receptors that respond to CD-NTase signals. Structures of Cap4 reveal a promiscuous DNA endonuclease domain activated through ligand-induced oligomerization. Oligonucleotide recognition occurs through an appended SAVED domain that is an unexpected fusion of two CRISPR-associated Rossman fold (CARF) subunits co-opted from type III CRISPR immunity. Like a lock and key, SAVED effectors exquisitely discriminate 2'-5'- and 3'-5'-linked bacterial cyclic oligonucleotide signals and enable specific recognition of at least 180 potential nucleotide second messenger species. Our results reveal SAVED CARF family proteins as major nucleotide second messenger receptors in CBASS and CRISPR immune defense and extend the importance of linkage specificity beyond mammalian cGAS-STING signaling.
| + | |
| - | | + | |
| - | CBASS Immunity Uses CARF-Related Effectors to Sense 3'-5'- and 2'-5'-Linked Cyclic Oligonucleotide Signals and Protect Bacteria from Phage Infection.,Lowey B, Whiteley AT, Keszei AFA, Morehouse BR, Mathews IT, Antine SP, Cabrera VJ, Kashin D, Niemann P, Jain M, Schwede F, Mekalanos JJ, Shao S, Lee ASY, Kranzusch PJ Cell. 2020 Jun 4. pii: S0092-8674(20)30614-0. doi: 10.1016/j.cell.2020.05.019. PMID:32544385<ref>PMID:32544385</ref>
| + | |
| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 6vm5" style="background-color:#fffaf0;"></div>
| + | |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Atcc 19976]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Antine, S P]] | + | [[Category: Moraxella osloensis]] |
| - | [[Category: Cabrera, V]] | + | [[Category: Antine SP]] |
| - | [[Category: Keszei, A F.A]] | + | [[Category: Cabrera V]] |
| - | [[Category: Kranzusch, P J]] | + | [[Category: Keszei AFA]] |
| - | [[Category: Lee, A S.Y]] | + | [[Category: Kranzusch PJ]] |
| - | [[Category: Lowey, B]] | + | [[Category: Lee ASY]] |
| - | [[Category: Mekalanos, J J]] | + | [[Category: Lowey B]] |
| - | [[Category: Morehouse, B R]] | + | [[Category: Mekalanos JJ]] |
| - | [[Category: Schwede, F]] | + | [[Category: Morehouse BR]] |
| - | [[Category: Shao, S]] | + | [[Category: Schwede F]] |
| - | [[Category: Whiteley, A T]] | + | [[Category: Shao S]] |
| - | [[Category: Carf]]
| + | [[Category: Whiteley AT]] |
| - | [[Category: Duf4297]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Nuclease]]
| + | |
| - | [[Category: Phage immunity]]
| + | |
| - | [[Category: Saved]]
| + | |
| Structural highlights
Function
CAP4_MOROS CBASS (cyclic oligonucleotide-based antiphage signaling system) provides immunity against bacteriophage. The CD-NTase protein synthesizes cyclic nucleotides in response to infection; these serve as specific second messenger signals. The signals activate a diverse range of effectors, leading to bacterial cell death and thus abortive phage infection (Probable). A type II-C CBASS system (PubMed:32839535).[1] [2] Probably in the presence of its endogenous cyclic nucleotide (synthesized by the cognate CD-NTase protein in the CBASS operon), or of 2',3',3'-cyclic AMP-AMP-AMP (cAAA) synthesized by Acinetobacter sp. ATCC 27244, endonucleolytically degrades dsDNA in a non-sequence specific manner. It is not activated by other cyclic nucleotides.[3]
References
- ↑ Millman A, Melamed S, Amitai G, Sorek R. Diversity and classification of cyclic-oligonucleotide-based anti-phage signalling systems. Nat Microbiol. 2020 Dec;5(12):1608-1615. doi: 10.1038/s41564-020-0777-y. Epub, 2020 Aug 24. PMID:32839535 doi:http://dx.doi.org/10.1038/s41564-020-0777-y
- ↑ Lowey B, Whiteley AT, Keszei AFA, Morehouse BR, Mathews IT, Antine SP, Cabrera VJ, Kashin D, Niemann P, Jain M, Schwede F, Mekalanos JJ, Shao S, Lee ASY, Kranzusch PJ. CBASS Immunity Uses CARF-Related Effectors to Sense 3'-5'- and 2'-5'-Linked Cyclic Oligonucleotide Signals and Protect Bacteria from Phage Infection. Cell. 2020 Jun 4. pii: S0092-8674(20)30614-0. doi: 10.1016/j.cell.2020.05.019. PMID:32544385 doi:http://dx.doi.org/10.1016/j.cell.2020.05.019
- ↑ Lowey B, Whiteley AT, Keszei AFA, Morehouse BR, Mathews IT, Antine SP, Cabrera VJ, Kashin D, Niemann P, Jain M, Schwede F, Mekalanos JJ, Shao S, Lee ASY, Kranzusch PJ. CBASS Immunity Uses CARF-Related Effectors to Sense 3'-5'- and 2'-5'-Linked Cyclic Oligonucleotide Signals and Protect Bacteria from Phage Infection. Cell. 2020 Jun 4. pii: S0092-8674(20)30614-0. doi: 10.1016/j.cell.2020.05.019. PMID:32544385 doi:http://dx.doi.org/10.1016/j.cell.2020.05.019
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