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- PDB-8j84: Short ago complexed with TIR-APAZ -

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Basic information

Entry
Database: PDB / ID: 8j84
TitleShort ago complexed with TIR-APAZ
Components
  • Piwi domain-containing protein
  • TIR domain-containing protein
KeywordsDNA BINDING PROTEIN / SPARTA / Ago / Tir
Function / homologyTIR domain / Toll/interleukin-1 receptor homology (TIR) domain / Toll/interleukin-1 receptor homology (TIR) domain superfamily / Ribonuclease H superfamily / nucleic acid binding / Ribonuclease H-like superfamily / signal transduction / Piwi domain-containing protein / TIR domain-containing protein
Function and homology information
Biological speciesThermoflavifilum thermophilum (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsGuo, L.J. / Huang, P.P. / Li, Z.X. / Xiao, Y.B. / Chen, M.R.
Funding support China, 5items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)Nos.2018YFA0902000 China
Ministry of Science and Technology (MoST, China)ZX-2021ZD0203404 China
National Natural Science Foundation of China (NSFC)Nos. 32271330 China
National Natural Science Foundation of China (NSFC)Nos. 32000889 China
National Natural Science Foundation of China (NSFC)31970547 China
CitationJournal: Nat Chem Biol / Year: 2024
Title: Auto-inhibition and activation of a short Argonaute-associated TIR-APAZ defense system.
Authors: Lijie Guo / Pingping Huang / Zhaoxing Li / Young-Cheul Shin / Purui Yan / Meiling Lu / Meirong Chen / Yibei Xiao /
Abstract: Short prokaryotic Ago accounts for most prokaryotic Argonaute proteins (pAgos) and is involved in defending bacteria against invading nucleic acids. Short pAgo associated with TIR-APAZ (SPARTA) has ...Short prokaryotic Ago accounts for most prokaryotic Argonaute proteins (pAgos) and is involved in defending bacteria against invading nucleic acids. Short pAgo associated with TIR-APAZ (SPARTA) has been shown to oligomerize and deplete NAD upon guide-mediated target DNA recognition. However, the molecular basis of SPARTA inhibition and activation remains unknown. In this study, we determined the cryogenic electron microscopy structures of Crenotalea thermophila SPARTA in its inhibited, transient and activated states. The SPARTA monomer is auto-inhibited by its acidic tail, which occupies the guide-target binding channel. Guide-mediated target binding expels this acidic tail and triggers substantial conformational changes to expose the Ago-Ago dimerization interface. As a result, SPARTA assembles into an active tetramer, where the four TIR domains are rearranged and packed to form NADase active sites. Together with biochemical evidence, our results provide a panoramic vision explaining SPARTA auto-inhibition and activation and expand understanding of pAgo-mediated bacterial defense systems.
History
DepositionApr 30, 2023Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Mar 13, 2024Provider: repository / Type: Initial release
Revision 1.1Apr 10, 2024Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Piwi domain-containing protein
B: TIR domain-containing protein


Theoretical massNumber of molelcules
Total (without water)111,5622
Polymers111,5622
Non-polymers00
Water0
1


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

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Components

#1: Protein Piwi domain-containing protein / Argonaute


Mass: 58304.848 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Thermoflavifilum thermophilum (bacteria)
Gene: SAMN05660895_1671 / Production host: Escherichia coli BL21 (bacteria) / References: UniProt: A0A1I7NFD7
#2: Protein TIR domain-containing protein / TIR-APAZ


Mass: 53256.734 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Thermoflavifilum thermophilum (bacteria)
Gene: SAMN05660895_1670 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A1I7NFG5

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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: Short ago complexed with TIR-APAZ / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Thermoflavifilum thermophilum (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2400 nm / Nominal defocus min: 1000 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 375800 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0027632
ELECTRON MICROSCOPYf_angle_d0.5710312
ELECTRON MICROSCOPYf_dihedral_angle_d6.8151008
ELECTRON MICROSCOPYf_chiral_restr0.0431106
ELECTRON MICROSCOPYf_plane_restr0.0031312

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