This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

6q1h

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Current revision

Structure of P. aeruginosa ATCC27853 NucC, cAAA-bound form

Structural highlights

6q1h is a 8 chain structure with sequence from Pseudomonas aeruginosa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.45Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NUCC_PSEAI 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. A type III-C(AAA) CBASS system (PubMed:32839535).^[1] ^[2] A cyclic nucleotide-activated dsDNase. In the presence of 3',3',3'-cyclic AMP-AMP-AMP (cAAA) and to a lesser extent cyclic-di-AMP (c-di-AMP), endonucleolytically degrades dsDNA (Probable). Binds one cAAA in a pocket on one surface of the trimer; cAAA binding promotes hexamerization which is probably necessary for nuclease activation (PubMed:31932164). The nuclease digests dsDNA to about 50 bp lengths. DNA has been modeled to contact a pair of juxtaposed active sites (one from each layer of the hexamer), accounting for cleavage on both strands (By similarity).[UniProtKB:D7Y2H5]^[3] ^[4]

Publication Abstract from PubMed

Bacteria possess an array of defenses against foreign invaders, including a broadly distributed bacteriophage defense system termed CBASS (cyclic oligonucleotide-based anti-phage signaling system). In CBASS systems, a cGAS/DncV-like nucleotidyltransferase synthesizes cyclic di- or tri-nucleotide second messengers in response to infection, and these molecules activate diverse effectors to mediate bacteriophage immunity via abortive infection. Here, we show that the CBASS effector NucC is related to restriction enzymes but uniquely assembles into a homotrimer. Binding of NucC trimers to a cyclic tri-adenylate second messenger promotes assembly of a NucC homohexamer competent for non-specific double-strand DNA cleavage. In infected cells, NucC activation leads to complete destruction of the bacterial chromosome, causing cell death prior to completion of phage replication. In addition to CBASS systems, we identify NucC homologs in over 30 type III CRISPR/Cas systems, where they likely function as accessory nucleases activated by cyclic oligoadenylate second messengers synthesized by these systems' effector complexes.

Structure and Mechanism of a Cyclic Trinucleotide-Activated Bacterial Endonuclease Mediating Bacteriophage Immunity.,Lau RK, Ye Q, Birkholz EA, Berg KR, Patel L, Mathews IT, Watrous JD, Ego K, Whiteley AT, Lowey B, Mekalanos JJ, Kranzusch PJ, Jain M, Pogliano J, Corbett KD Mol Cell. 2020 Jan 6. pii: S1097-2765(19)30923-2. doi:, 10.1016/j.molcel.2019.12.010. PMID:31932164^[5]

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

References

↑ Ye Q, Lau RK, Mathews IT, Birkholz EA, Watrous JD, Azimi CS, Pogliano J, Jain M, Corbett KD. HORMA Domain Proteins and a Trip13-like ATPase Regulate Bacterial cGAS-like Enzymes to Mediate Bacteriophage Immunity. Mol Cell. 2019 Dec 31. pii: S1097-2765(19)30922-0. doi:, 10.1016/j.molcel.2019.12.009. PMID:31932165 doi:http://dx.doi.org/10.1016/j.molcel.2019.12.009
↑ 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
↑ Lau RK, Ye Q, Birkholz EA, Berg KR, Patel L, Mathews IT, Watrous JD, Ego K, Whiteley AT, Lowey B, Mekalanos JJ, Kranzusch PJ, Jain M, Pogliano J, Corbett KD. Structure and Mechanism of a Cyclic Trinucleotide-Activated Bacterial Endonuclease Mediating Bacteriophage Immunity. Mol Cell. 2020 Jan 6. pii: S1097-2765(19)30923-2. doi:, 10.1016/j.molcel.2019.12.010. PMID:31932164 doi:http://dx.doi.org/10.1016/j.molcel.2019.12.010
↑ Ye Q, Lau RK, Mathews IT, Birkholz EA, Watrous JD, Azimi CS, Pogliano J, Jain M, Corbett KD. HORMA Domain Proteins and a Trip13-like ATPase Regulate Bacterial cGAS-like Enzymes to Mediate Bacteriophage Immunity. Mol Cell. 2019 Dec 31. pii: S1097-2765(19)30922-0. doi:, 10.1016/j.molcel.2019.12.009. PMID:31932165 doi:http://dx.doi.org/10.1016/j.molcel.2019.12.009
↑ Lau RK, Ye Q, Birkholz EA, Berg KR, Patel L, Mathews IT, Watrous JD, Ego K, Whiteley AT, Lowey B, Mekalanos JJ, Kranzusch PJ, Jain M, Pogliano J, Corbett KD. Structure and Mechanism of a Cyclic Trinucleotide-Activated Bacterial Endonuclease Mediating Bacteriophage Immunity. Mol Cell. 2020 Jan 6. pii: S1097-2765(19)30923-2. doi:, 10.1016/j.molcel.2019.12.010. PMID:31932164 doi:http://dx.doi.org/10.1016/j.molcel.2019.12.010

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6q1h"

Categories: Large Structures | Pseudomonas aeruginosa | Corbett KD | Lau RK | Ye Q

@@ Line 3: / Line 3: @@
 <StructureSection load='6q1h' size='340' side='right'caption='[[6q1h]], [[Resolution|resolution]] 1.45&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6q1h]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_aeruginosus"_(schroeter_1872)_trevisan_1885 "bacillus aeruginosus" (schroeter 1872) trevisan 1885]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6Q1H OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6Q1H FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6q1h]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa Pseudomonas aeruginosa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6Q1H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6Q1H FirstGlance]. <br>
-</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6p7o|6p7o]], [[6p7p|6p7p]], [[6p7q|6p7q]]</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]] 1.45&#8491;</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ORF C62 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=287 "Bacillus aeruginosus" (Schroeter 1872) Trevisan 1885])</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=6q1h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6q1h OCA], [https://pdbe.org/6q1h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6q1h RCSB], [https://www.ebi.ac.uk/pdbsum/6q1h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6q1h ProSAT]</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=6q1h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6q1h OCA], [http://pdbe.org/6q1h PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6q1h RCSB], [http://www.ebi.ac.uk/pdbsum/6q1h PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6q1h ProSAT]</span></td></tr>
 </table>
+== Function ==
+[https://www.uniprot.org/uniprot/NUCC_PSEAI NUCC_PSEAI] 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. A type III-C(AAA) CBASS system (PubMed:32839535).<ref>PMID:31932165</ref> <ref>PMID:32839535</ref>   A cyclic nucleotide-activated dsDNase. In the presence of 3',3',3'-cyclic AMP-AMP-AMP (cAAA) and to a lesser extent cyclic-di-AMP (c-di-AMP), endonucleolytically degrades dsDNA (Probable). Binds one cAAA in a pocket on one surface of the trimer; cAAA binding promotes hexamerization which is probably necessary for nuclease activation (PubMed:31932164). The nuclease digests dsDNA to about 50 bp lengths. DNA has been modeled to contact a pair of juxtaposed active sites (one from each layer of the hexamer), accounting for cleavage on both strands (By similarity).[UniProtKB:D7Y2H5]<ref>PMID:31932164</ref> <ref>PMID:31932165</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==
@@ Line 22: / Line 23: @@
 </StructureSection>
 [[Category: Large Structures]]
-[[Category: Corbett, K D]]
+[[Category: Pseudomonas aeruginosa]]
-[[Category: Lau, R K]]
+[[Category: Corbett KD]]
-[[Category: Ye, Q]]
+[[Category: Lau RK]]
-[[Category: Dna binding protein]]
+[[Category: Ye Q]]
-[[Category: Dna binding protein-rna complex]]
-[[Category: Nuclease]]

6q1h

From Proteopedia

Current revision

Structure of P. aeruginosa ATCC27853 NucC, cAAA-bound form

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox