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- PDB-8i87: Cryo-EM structure of TIR-APAZ/Ago-gRNA-DNA complex -

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Basic information

Entry
Database: PDB / ID: 8i87
TitleCryo-EM structure of TIR-APAZ/Ago-gRNA-DNA complex
Components
  • DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')
  • Piwi domain-containing protein
  • RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')
  • TIR domain-containing protein
KeywordsANTIVIRAL PROTEIN / a protein complex
Function / homology
Function and homology information


nucleic acid binding / signal transduction
Similarity search - Function
TIR domain / TIR domain profile. / Toll/interleukin-1 receptor homology (TIR) domain / Toll/interleukin-1 receptor homology (TIR) domain superfamily / Ribonuclease H superfamily / Ribonuclease H-like superfamily
Similarity search - Domain/homology
DNA / DNA (> 10) / RNA / RNA (> 10) / Piwi domain-containing protein / TIR domain-containing protein
Similarity search - Component
Biological speciesMaribacter polysiphoniae (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsZhang, H. / Deng, Z.Q. / Yu, G.M. / Li, X.Z. / Wang, X.S.
Funding support1items
OrganizationGrant numberCountry
Other government
CitationJournal: 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
DepositionFeb 3, 2023Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Jul 19, 2023Provider: repository / Type: Initial release
Revision 1.1Sep 13, 2023Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: TIR domain-containing protein
B: Piwi domain-containing protein
C: TIR domain-containing protein
D: Piwi domain-containing protein
F: Piwi domain-containing protein
G: TIR domain-containing protein
O: TIR domain-containing protein
T: Piwi domain-containing protein
E: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')
H: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')
I: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')
J: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')
K: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')
L: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')
S: RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')
U: DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')
hetero molecules


Theoretical massNumber of molelcules
Total (without water)492,95920
Polymers492,86216
Non-polymers974
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: SAXS
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
TIR domain-containing protein


Mass: 53270.594 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Maribacter polysiphoniae (bacteria) / Gene: LX92_01810 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A316E683
#2: Protein
Piwi domain-containing protein


Mass: 58091.410 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Maribacter polysiphoniae (bacteria) / Gene: LX92_01809 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A316E3U6
#3: DNA chain
DNA (5'-D(P*TP*AP*TP*AP*CP*AP*AP*CP*CP*TP*AP*CP*TP*AP*CP*CP*TP*CP*A)-3')


Mass: 5692.727 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Maribacter polysiphoniae (bacteria) / Production host: Escherichia coli (E. coli)
#4: RNA chain
RNA (5'-R(P*UP*GP*AP*GP*GP*UP*AP*GP*UP*AP*GP*GP*UP*UP*GP*UP*AP*UP*A)-3')


Mass: 6160.674 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Maribacter polysiphoniae (bacteria) / Production host: Escherichia coli (E. coli)
#5: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: TIR-APAZ/Ago-gRNA-DNA complex / Type: COMPLEX / Entity ID: #1, #4, #3, #2 / Source: MULTIPLE SOURCES
Source (natural)Organism: Maribacter polysiphoniae (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 257382 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 84.7 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00332095
ELECTRON MICROSCOPYf_angle_d0.50944072
ELECTRON MICROSCOPYf_dihedral_angle_d12.4935293
ELECTRON MICROSCOPYf_chiral_restr0.044925
ELECTRON MICROSCOPYf_plane_restr0.0045044

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