+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-35240 | |||||||||
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Title | Cryo-EM structure of TIR-APAZ/Ago-gRNA-DNA complex | |||||||||
Map data | ||||||||||
Sample |
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Keywords | a protein complex / ANTIVIRAL PROTEIN | |||||||||
Function / homology | Function and homology information | |||||||||
Biological species | Maribacter polysiphoniae (bacteria) | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||
Authors | Zhang H / Deng ZQ / Yu GM / Li XZ / Wang XS | |||||||||
Funding support | 1 items
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Citation | Journal: Cell Res / Year: 2023 Title: Structural insights into mechanisms of Argonaute protein-associated NADase activation in bacterial immunity. Authors: Xiaoshen Wang / Xuzichao Li / Guimei Yu / Lingling Zhang / Chendi Zhang / Yong Wang / Fumeng Liao / Yanan Wen / Hang Yin / Xiang Liu / Yong Wei / Zhuang Li / Zengqin Deng / Heng Zhang / Abstract: Nicotinamide adenine dinucleotide (NAD) is a central metabolite in cellular processes. Depletion of NAD has been demonstrated to be a prevalent theme in both prokaryotic and eukaryotic immune ...Nicotinamide adenine dinucleotide (NAD) is a central metabolite in cellular processes. Depletion of NAD has been demonstrated to be a prevalent theme in both prokaryotic and eukaryotic immune responses. Short prokaryotic Argonaute proteins (Agos) are associated with NADase domain-containing proteins (TIR-APAZ or SIR2-APAZ) encoded in the same operon. They confer immunity against mobile genetic elements, such as bacteriophages and plasmids, by inducing NAD depletion upon recognition of target nucleic acids. However, the molecular mechanisms underlying the activation of such prokaryotic NADase/Ago immune systems remain unknown. Here, we report multiple cryo-EM structures of NADase/Ago complexes from two distinct systems (TIR-APAZ/Ago and SIR2-APAZ/Ago). Target DNA binding triggers tetramerization of the TIR-APAZ/Ago complex by a cooperative self-assembly mechanism, while the heterodimeric SIR2-APAZ/Ago complex does not assemble into higher-order oligomers upon target DNA binding. However, the NADase activities of these two systems are unleashed via a similar closed-to-open transition of the catalytic pocket, albeit by different mechanisms. Furthermore, a functionally conserved sensor loop is employed to inspect the guide RNA-target DNA base pairing and facilitate the conformational rearrangement of Ago proteins required for the activation of these two systems. Overall, our study reveals the mechanistic diversity and similarity of Ago protein-associated NADase systems in prokaryotic immune response. | |||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_35240.map.gz | 97.2 MB | EMDB map data format | |
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Header (meta data) | emd-35240-v30.xml emd-35240.xml | 17 KB 17 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_35240_fsc.xml | 9.9 KB | Display | FSC data file |
Images | emd_35240.png | 140.5 KB | ||
Others | emd_35240_half_map_1.map.gz emd_35240_half_map_2.map.gz | 95.7 MB 95.7 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-35240 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-35240 | HTTPS FTP |
-Related structure data
Related structure data | 8i87MC 8i88C 8in8C M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_35240.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Voxel size | X=Y=Z: 0.95 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_35240_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_35240_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Sample components
-Entire : TIR-APAZ/Ago-gRNA-DNA complex
Entire | Name: TIR-APAZ/Ago-gRNA-DNA complex |
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Components |
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-Supramolecule #1: TIR-APAZ/Ago-gRNA-DNA complex
Supramolecule | Name: TIR-APAZ/Ago-gRNA-DNA complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1, #4, #3, #2 |
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Source (natural) | Organism: Maribacter polysiphoniae (bacteria) |
-Macromolecule #1: TIR domain-containing protein
Macromolecule | Name: TIR domain-containing protein / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: Maribacter polysiphoniae (bacteria) |
Molecular weight | Theoretical: 53.270594 KDa |
Recombinant expression | Organism: Escherichia coli (E. coli) |
Sequence | String: MRNKIFISHA TPDDNDFTRW LALKLIGLGY EVWCDILFLD KGVDFWSNIE KVIREDTCKF LLVSSSYSNQ REGVLKELAV AAKVKKQLK DDKFIIPLAI DEQLSYDDIN IDIVRLNAID FKMSWARGLK DILEAFEKQK VPKEVADASK SNLLYQQIFL H DKSVIEKE ...String: MRNKIFISHA TPDDNDFTRW LALKLIGLGY EVWCDILFLD KGVDFWSNIE KVIREDTCKF LLVSSSYSNQ REGVLKELAV AAKVKKQLK DDKFIIPLAI DEQLSYDDIN IDIVRLNAID FKMSWARGLK DILEAFEKQK VPKEVADASK SNLLYQQIFL H DKSVIEKE EIYDSNWLSI LSFPEELRFH EYNWMLPKRF DVRELTFPAV RYKNYLCTFA WAYDFTYHLP KTETYHKSKT IR IPTEEIL SGSYDSNFIR NAECKRLIVQ LLNKAFELRM KDKEVQEYEM SNKTAYWLEK GKLEKDKFEK TMLVGKQKDK NWH FAISGA SKLYPFPVLM ISSHIFFTAD GKKLIDSSSV QHSSRRRQGK NWWNNTWRTK LLAFIKYLSD DDTSFYLEMG SEEK VFVSN EPVKFKGNVS YNIPEKNTLE EEAELSGFNQ GEDIEELEEL IENLEAE UniProtKB: TIR domain-containing protein |
-Macromolecule #2: Piwi domain-containing protein
Macromolecule | Name: Piwi domain-containing protein / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: Maribacter polysiphoniae (bacteria) |
Molecular weight | Theoretical: 58.09141 KDa |
Recombinant expression | Organism: Escherichia coli (E. coli) |
Sequence | String: MKELIYIEEP KILFAHGQKC TDARDGLALF GPLNNLYGIK SGVIGTKQGL KIFRDYLDHI QKPIYNSNSI TRPMFPGFEA VFDCKWEST GITFKEVTNE DIGKFLYNSS THKRTYDLVS LFIDKIISAN KNEDENVDVW FVIVPDEIYK YCRPNSVLPK E MVQTKALM ...String: MKELIYIEEP KILFAHGQKC TDARDGLALF GPLNNLYGIK SGVIGTKQGL KIFRDYLDHI QKPIYNSNSI TRPMFPGFEA VFDCKWEST GITFKEVTNE DIGKFLYNSS THKRTYDLVS LFIDKIISAN KNEDENVDVW FVIVPDEIYK YCRPNSVLPK E MVQTKALM SKSKAKSFRY EPSLFPDINI ELKEQEKEAE TYNYDAQFHD QFKARLLKHT IPTQIFREST LAWRDFKNAF GL PIRDFSK IEGHLAWTIS TAAFYKAGGK PWKLSDVRNG VCYLGLVYKK VEKSKNPRNA CCAAQMFLDN GDGTVFKGEV GPW YNPKNG QYHLEPKEAK ALLSQSLQSY KEQIGEYPKE VFIHAKTRFN HQEWDAFLEV TPKETNLVGV TISKTKPLKL YKTE GDYTI LRGNAYVVNE RSAFLWTVGY VPKIQTALSM EVPNPLFIEI NKGEADIKQV LKDILSLTKL NYNACIFADG EPVTL RFAD KIGEILTAST DIKTPPLAFK YYI UniProtKB: Piwi domain-containing protein |
-Macromolecule #3: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP...
Macromolecule | Name: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3') type: dna / ID: 3 / Number of copies: 4 / Classification: DNA |
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Source (natural) | Organism: Maribacter polysiphoniae (bacteria) |
Molecular weight | Theoretical: 5.692727 KDa |
Sequence | String: (DT)(DA)(DT)(DA)(DC)(DA)(DA)(DC)(DC)(DT) (DA)(DC)(DT)(DA)(DC)(DC)(DT)(DC)(DA) |
-Macromolecule #4: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP...
Macromolecule | Name: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3') type: rna / ID: 4 / Number of copies: 4 |
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Source (natural) | Organism: Maribacter polysiphoniae (bacteria) |
Molecular weight | Theoretical: 6.160674 KDa |
Sequence | String: UGAGGUAGUA GGUUGUAUA |
-Macromolecule #5: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 4 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | single particle reconstruction |
Aggregation state | particle |
-Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE |
-Electron microscopy
Microscope | JEOL CRYO ARM 300 |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 40.0 e/Å2 |