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- EMDB-41966: Cryo-EM structure of the SPARTA oligomer with guide RNA and target DNA -
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Open data
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Basic information
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Title | Cryo-EM structure of the SPARTA oligomer with guide RNA and target DNA | |||||||||
![]() | composite map | |||||||||
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![]() | RNA / DNA / Argonaute / TIR / immune system / RNA BINDING PROTEIN-RNA-DNA complex | |||||||||
Function / homology | TIR domain / Toll/interleukin-1 receptor homology (TIR) domain / Toll/interleukin-1 receptor homology (TIR) domain superfamily / nucleic acid binding / Ribonuclease H superfamily / Ribonuclease H-like superfamily / signal transduction / Piwi domain-containing protein / TIR domain-containing protein![]() | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.15 Å | |||||||||
![]() | Malik R / Kottur J / Aggarwal AK | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Nucleic acid mediated activation of a short prokaryotic Argonaute immune system. Authors: Jithesh Kottur / Radhika Malik / Aneel K Aggarwal / ![]() ![]() Abstract: A short prokaryotic Argonaute (pAgo) TIR-APAZ (SPARTA) defense system, activated by invading DNA to unleash its TIR domain for NAD(P) hydrolysis, was recently identified in bacteria. We report the ...A short prokaryotic Argonaute (pAgo) TIR-APAZ (SPARTA) defense system, activated by invading DNA to unleash its TIR domain for NAD(P) hydrolysis, was recently identified in bacteria. We report the crystal structure of SPARTA heterodimer in the absence of guide-RNA/target-ssDNA (2.66 Å) and a cryo-EM structure of the SPARTA oligomer (tetramer of heterodimers) bound to guide-RNA/target-ssDNA at nominal 3.15-3.35 Å resolution. The crystal structure provides a high-resolution view of SPARTA, revealing the APAZ domain as equivalent to the N, L1, and L2 regions of long pAgos and the MID domain containing a unique insertion (insert57). Cryo-EM structure reveals regions of the PIWI (loop10-9) and APAZ (helix αN) domains that reconfigure for nucleic-acid binding and decrypts regions/residues that reorganize to expose a positively charged pocket for higher-order assembly. The TIR domains amass in a parallel-strands arrangement for catalysis. We visualize SPARTA before and after RNA/ssDNA binding and uncover the basis of its active assembly leading to abortive infection. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 361.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14.1 KB 14.1 KB | Display Display | ![]() |
Images | ![]() | 144.5 KB | ||
Filedesc metadata | ![]() | 6.4 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 514.9 KB | Display | ![]() |
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Full document | ![]() | 514.4 KB | Display | |
Data in XML | ![]() | 7.7 KB | Display | |
Data in CIF | ![]() | 8.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8u72MC ![]() 8u7bC C: citing same article ( M: atomic model generated by this map |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | composite map | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.083 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
-Entire : SPARTA complex with gRNA/tDNA
Entire | Name: SPARTA complex with gRNA/tDNA |
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Components |
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-Supramolecule #1: SPARTA complex with gRNA/tDNA
Supramolecule | Name: SPARTA complex with gRNA/tDNA / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: 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: 1 / Number of copies: 4 |
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Source (natural) | Organism: synthetic construct (others) |
Molecular weight | Theoretical: 6.812045 KDa |
Sequence | String: UGAGGUAGUA GGUUGUAUAG U |
-Macromolecule #2: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*C)-3')
Macromolecule | Name: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*C)-3') type: dna / ID: 2 / Number of copies: 4 / Classification: DNA |
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Source (natural) | Organism: synthetic construct (others) |
Molecular weight | Theoretical: 13.703841 KDa |
Sequence | String: (DA)(DA)(DA)(DC)(DG)(DA)(DC)(DG)(DG)(DC) (DC)(DA)(DG)(DT)(DG)(DC)(DC)(DA)(DA)(DG) (DC)(DT)(DT)(DA)(DC)(DT)(DA)(DT)(DA) (DC)(DA)(DA)(DC)(DC)(DT)(DA)(DC)(DT)(DA) (DC) (DC)(DT)(DC)(DA)(DT) |
-Macromolecule #3: TIR domain-containing protein
Macromolecule | Name: TIR domain-containing protein / type: protein_or_peptide / ID: 3 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 53.256734 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MRNKIFISHA TPEDDDFTRW LSLKLIGLGY EVWCDILFLD KGVDFWSTIE KEIRENTCKF LIVSSTAGNK REGVLKELAV ATKVKKHLQ DDMFIIPLAI DENLSYDDIN IEIVRLNAID FKKSWAKGLQ DLLDAFEKQN VPKKPPDHSK SNLLYQQIFL H DKQAIEKE ...String: MRNKIFISHA TPEDDDFTRW LSLKLIGLGY EVWCDILFLD KGVDFWSTIE KEIRENTCKF LIVSSTAGNK REGVLKELAV ATKVKKHLQ DDMFIIPLAI DENLSYDDIN IEIVRLNAID FKKSWAKGLQ DLLDAFEKQN VPKKPPDHSK SNLLYQQIFL H DKQAIEKE ETYDSNWFPI ISFPNELRFH RYDWRLPKQF DVRTLAFPAI RYKEYLCTFA WEYDFIHQLP KTETYNGQES IR ISTSDIL SGRYDTDFIR NYECQRLIVQ LINKAFELRM KDKNVREYQM SKTFAYWIEK GKLEKDKFEK IKLVGKQKNK YWH FGISAA GKLYPSPVLM VSSHIIFTMD GINLIKSKSI QHSSRRKQGK NWWNDKWREK LLAFIRFLSD DQNAIYLNVG SEEK ILISN KPLKFFGKMS YVTPSEVTLE EESVLADINN FEEDTEDLDE LEDIE UniProtKB: TIR domain-containing protein |
-Macromolecule #4: Piwi domain-containing protein
Macromolecule | Name: Piwi domain-containing protein / type: protein_or_peptide / ID: 4 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 58.304848 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MKELIYIEEP SILFAHGQKC TDPRDGLALF GPLNQIYGIK SGVVGTQKGL QIFKSYLDKI QKPIYNHNNI TRPMFPGFEA VFGCKWESQ NIVFKEITDE EIRRYLFNAS THKRTYDLVT LFNDKIITAN KNDEERVDVW FVIVPEEIYK YCRPNSVLPN E LVQTKSLI ...String: MKELIYIEEP SILFAHGQKC TDPRDGLALF GPLNQIYGIK SGVVGTQKGL QIFKSYLDKI QKPIYNHNNI TRPMFPGFEA VFGCKWESQ NIVFKEITDE EIRRYLFNAS THKRTYDLVT LFNDKIITAN KNDEERVDVW FVIVPEEIYK YCRPNSVLPN E LVQTKSLI SKSKAKSFRY TPTLFEEFNK KLKEVEKEAK TYNYDAQFHD QLKARLLEHT IPTQILREST LAWRDFKNTF GA PIRDFSK IEGHLAWTIS TAAYYKAGGK PWKLGDIRPG VCYLGLVYKK IEKSKNPQNA CCAAQMFLDN GDGTVFKGEV GPW YNPEKG EYHLKPKEAK ALLTQALESY KEQNKSYPKE VFIHARTRFN DEEWNAFNEV TPKNTNLVGV TITKSKPLKL YKTE GAFPI MRGNAYIVDE KKAFLWTLGF VPKLQSTLSM EVPNPIFIEI NKGEAEIQQV LKDILALTKL NYNACIYADG EPVTL RFAN KIGEILTAST EIKTPPLAFK YYI UniProtKB: Piwi domain-containing protein |
-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 |
-Macromolecule #6: water
Macromolecule | Name: water / type: ligand / ID: 6 / Number of copies: 57 / Formula: HOH |
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Molecular weight | Theoretical: 18.015 Da |
Chemical component information | ![]() ChemComp-HOH: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Sugar embedding | Material: Vitreous ice |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 51.11 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.8 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: NONE |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.15 Å / Resolution method: FSC 0.143 CUT-OFF / Details: Composite cryo-EM map / Number images used: 238432 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |