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- EMDB-44486: Structure of apo-state V. cholerae DdmD -

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Basic information

Entry
Database: EMDB / ID: EMD-44486
TitleStructure of apo-state V. cholerae DdmD
Map data
Sample
  • Complex: Dimeric complex of apo-state V. cholerae DdmD
    • Protein or peptide: Helicase/UvrB N-terminal domain-containing protein
KeywordsVibrio cholerae / bacteria / anti-plasmids / defense system / DNA defense modules(Ddm) / DdmDE / IMMUNE SYSTEM
Function / homologyHelicase/UvrB N-terminal domain-containing protein
Function and homology information
Biological speciesVibrio cholerae (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsShen ZF / Yang XY / Fu TM
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Cell / Year: 2024
Title: DdmDE eliminates plasmid invasion by DNA-guided DNA targeting.
Authors: Xiao-Yuan Yang / Zhangfei Shen / Chen Wang / Kotaro Nakanishi / Tian-Min Fu /
Abstract: Horizontal gene transfer is a key driver of bacterial evolution, but it also presents severe risks to bacteria by introducing invasive mobile genetic elements. To counter these threats, bacteria have ...Horizontal gene transfer is a key driver of bacterial evolution, but it also presents severe risks to bacteria by introducing invasive mobile genetic elements. To counter these threats, bacteria have developed various defense systems, including prokaryotic Argonautes (pAgos) and the DNA defense module DdmDE system. Through biochemical analysis, structural determination, and in vivo plasmid clearance assays, we elucidate the assembly and activation mechanisms of DdmDE, which eliminates small, multicopy plasmids. We demonstrate that DdmE, a pAgo-like protein, acts as a catalytically inactive, DNA-guided, DNA-targeting defense module. In the presence of guide DNA, DdmE targets plasmids and recruits a dimeric DdmD, which contains nuclease and helicase domains. Upon binding to DNA substrates, DdmD transitions from an autoinhibited dimer to an active monomer, which then translocates along and cleaves the plasmids. Together, our findings reveal the intricate mechanisms underlying DdmDE-mediated plasmid clearance, offering fundamental insights into bacterial defense systems against plasmid invasions.
History
DepositionApr 16, 2024-
Header (metadata) releaseAug 21, 2024-
Map releaseAug 21, 2024-
UpdateJun 4, 2025-
Current statusJun 4, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_44486.png

Downloads & links

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Map

FileDownload / File: emd_44486.map.gz / Format: CCP4 / Size: 343 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.53 Å/pix.
x 448 pix.
= 237.44 Å		0.53 Å/pix.
x 448 pix.
= 237.44 Å		0.53 Å/pix.
x 448 pix.
= 237.44 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.53 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.017514402 - 2.1359594
Average (Standard dev.)0.0024687503 (±0.033841673)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions448448448
Spacing448448448
CellA=B=C: 237.43999 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_44486_additional_1.map
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Half map: #2

Fileemd_44486_half_map_1.map
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Histogram

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Half map: #1

Fileemd_44486_half_map_2.map
Projections & Slices
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Sample components

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Entire : Dimeric complex of apo-state V. cholerae DdmD

EntireName: Dimeric complex of apo-state V. cholerae DdmD
Components
  • Complex: Dimeric complex of apo-state V. cholerae DdmD
    • Protein or peptide: Helicase/UvrB N-terminal domain-containing protein

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Supramolecule #1: Dimeric complex of apo-state V. cholerae DdmD

SupramoleculeName: Dimeric complex of apo-state V. cholerae DdmD / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Vibrio cholerae (bacteria)

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

MacromoleculeName: Helicase/UvrB N-terminal domain-containing protein / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Vibrio cholerae (bacteria)
Molecular weightTheoretical: 136.155328 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MNVSIEEFTH FDFQLVPEPS PLDLVITEPL KNHIEVNGVK SGALLPLPFQ TGIGKTYTAL NFLLQQMLEQ VRSELKEENT GKKSKRLLY YVTDSVDNVV SAKADLLKLI EKQTVKGEPR FTLEQQEYLK AQIVHLPNQS EQLLQCSDAV LNDVLIGFNL N AERDVQAE ...String:
MNVSIEEFTH FDFQLVPEPS PLDLVITEPL KNHIEVNGVK SGALLPLPFQ TGIGKTYTAL NFLLQQMLEQ VRSELKEENT GKKSKRLLY YVTDSVDNVV SAKADLLKLI EKQTVKGEPR FTLEQQEYLK AQIVHLPNQS EQLLQCSDAV LNDVLIGFNL N AERDVQAE WSAISGLRRH ASNPEVKISL NRQAGYFYRN LIDRLQKKQK GADRVLLSGS LLASVETLLP GEKIRNGSAH VA FLTTSKF LKGFHNTRSR YSPLRDLSGA VLIIDEIDKQ NQVILSELCK QQAQDLIWAI RTLRANFRDH QLESSPRYDK IED LFEPLR ERLEEFGTNW NLAFAFNTEG ANLNERPVRL FSDRSFTHVS SATHKLSLKS DFLRRKNLIF SDEKVEGSLI EKHG LLTRF VNEADVIYQW FLGTMRKAVF QYWENVRGLE IEVRENRSLE GTFQEAVQSL LTHFNLQEFE SAVYESFDTR GLRQS AGGK ANKLSSSKSY HHTGLKLVEV AHNQGTRDTV NCKASFLNTS PSGVLADMVD AGAVILGISA TARADTVIHN FDFKYL NER LGNKLLSLSR EQKQRVNNYY HSRRNYKDNG VVLTVKYLNS RDAFLDALLE EYKPEARSSH FILNHYLGIA ESEQAFV RS WLSKLLASIK AFISSPDNRY MLSLLNRTLD TTRQNINDFI QFCCDKWAKE FNVKTKTFFG VNADWMRLVG YDEISKHL N TELGKVVVFS TYASMGAGKN PDYAVNLALE GESLISVADV TYSTQLRSDI DSIYLEKPTQ LLLSDDYSHT ANQLCQFHQ ILSLQENGEL SPKSAENWCR QQLMGMSRER SLQQYHQTSD YQSAVRKYIE QAVGRAGRTS LKRKQILLFV DSGLKEILAE ESRDPSLFS HEYVALVNKA KSAGKSIVED RAVRRLFNLA QRNNKDGMLS IKALVHRLHN QPASKSDIQE WQDIRTQLLR Y PTVAFQPE RFNRLYLQSM TKGYYRYQGN LDGDPNSFEF FDRVPYGDMV SEEDCSLATL VQNQYVRPWF ERKGFACSWQ KE ANVMTPI MFTNIYKGAL GEQAVEAVLT AFDFTFEEVP NSIYERFDNR VIFAGIEQPI WLDSKYWKHE GNESSEGYSS KIA LVEEEF GPSKFIYVNA LGDTSKPIRY LNSCFVETSP QLAKVIEIPA LIDDSNADTN RTAVQELIKW LHHS

UniProtKB: Helicase/UvrB N-terminal domain-containing protein

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration3 mg/mL
BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 400 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 120 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 6 K

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 536829
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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