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- PDB-9bqv: DdmD dimer apoprotein -

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Basic information

Entry
Database: PDB / ID: 9bqv
TitleDdmD dimer apoprotein
ComponentsHelicase/UvrB N-terminal domain-containing protein
KeywordsIMMUNE SYSTEM / DdmD / helicase / nuclease
Function / homologyHelicase/UvrB N-terminal domain-containing protein
Function and homology information
Biological speciesVibrio cholerae (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsBravo, J.P.K. / Taylor, D.W.
Funding support United States, 2items
OrganizationGrant numberCountry
Welch FoundationF-1938 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM138348 United States
CitationJournal: Nature / Year: 2024
Title: Plasmid targeting and destruction by the DdmDE bacterial defence system.
Authors: Jack P K Bravo / Delisa A Ramos / Rodrigo Fregoso Ocampo / Caiden Ingram / David W Taylor /
Abstract: Although eukaryotic Argonautes have a pivotal role in post-transcriptional gene regulation through nucleic acid cleavage, some short prokaryotic Argonaute variants (pAgos) rely on auxiliary nuclease ...Although eukaryotic Argonautes have a pivotal role in post-transcriptional gene regulation through nucleic acid cleavage, some short prokaryotic Argonaute variants (pAgos) rely on auxiliary nuclease factors for efficient foreign DNA degradation. Here we reveal the activation pathway of the DNA defence module DdmDE system, which rapidly eliminates small, multicopy plasmids from the Vibrio cholerae seventh pandemic strain (7PET). Through a combination of cryo-electron microscopy, biochemistry and in vivo plasmid clearance assays, we demonstrate that DdmE is a catalytically inactive, DNA-guided, DNA-targeting pAgo with a distinctive insertion domain. We observe that the helicase-nuclease DdmD transitions from an autoinhibited, dimeric complex to a monomeric state upon loading of single-stranded DNA targets. Furthermore, the complete structure of the DdmDE-guide-target handover complex provides a comprehensive view into how DNA recognition triggers processive plasmid destruction. Our work establishes a mechanistic foundation for how pAgos utilize ancillary factors to achieve plasmid clearance, and provides insights into anti-plasmid immunity in bacteria.
History
DepositionMay 10, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 3, 2024Provider: repository / Type: Initial release
Revision 1.0Jul 3, 2024Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Jul 3, 2024Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
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Revision 1.0Jul 3, 2024Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
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Revision 1.0Jul 3, 2024Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jul 3, 2024Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jul 10, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID / _em_admin.last_update
Revision 1.2May 21, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
Revision 1.1May 21, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Helicase/UvrB N-terminal domain-containing protein
F: Helicase/UvrB N-terminal domain-containing protein


Theoretical massNumber of molelcules
Total (without water)272,2912
Polymers272,2912
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Helicase/UvrB N-terminal domain-containing protein / DdmD


Mass: 136145.297 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Vibrio cholerae (bacteria) / Gene: VPI2_0019c / Production host: Escherichia coli (E. coli) / References: UniProt: B9TSM3
Has protein modificationN

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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: DdmD apo dimer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.21154 MDa / Experimental value: YES
Source (natural)Organism: Streptococcus pyogenes (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: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 90513 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.02119096
ELECTRON MICROSCOPYf_angle_d1.29925808
ELECTRON MICROSCOPYf_dihedral_angle_d43.3232541
ELECTRON MICROSCOPYf_chiral_restr0.0742851
ELECTRON MICROSCOPYf_plane_restr0.0073355

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