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- EMDB-42960: CryoEM Structure of Diffocin - postcontracted - Trunk -

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Basic information

Entry
Database: EMDB / ID: EMD-42960
TitleCryoEM Structure of Diffocin - postcontracted - Trunk
Map data
Sample
  • Complex: Diffocin
    • Protein or peptide: Sheath (CD1363)
KeywordsPhage tail-like / bacteriocin / trunk / post-contraction / VIRUS LIKE PARTICLE
Function / homologyTail sheath protein, subtilisin-like domain / Phage tail sheath protein subtilisin-like domain / Tail sheath protein, C-terminal domain / Phage tail sheath C-terminal domain / Phage tail sheath protein
Function and homology information
Biological speciesClostridioides difficile (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsCai XY / He Y / Zhou ZH
Funding support United States, 3 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM071940 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI094386 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI085318 United States
CitationJournal: Nat Commun / Year: 2024
Title: Atomic structures of a bacteriocin targeting Gram-positive bacteria.
Authors: Xiaoying Cai / Yao He / Iris Yu / Anthony Imani / Dean Scholl / Jeff F Miller / Z Hong Zhou /
Abstract: Due to envelope differences between Gram-positive and Gram-negative bacteria, engineering precision bactericidal contractile nanomachines requires atomic-level understanding of their structures; ...Due to envelope differences between Gram-positive and Gram-negative bacteria, engineering precision bactericidal contractile nanomachines requires atomic-level understanding of their structures; however, only those killing Gram-negative bacteria are currently known. Here, we report the atomic structures of an engineered diffocin, a contractile syringe-like molecular machine that kills the Gram-positive bacterium Clostridioides difficile. Captured in one pre-contraction and two post-contraction states, each structure fashions six proteins in the bacteria-targeting baseplate, two proteins in the energy-storing trunk, and a collar linking the sheath with the membrane-penetrating tube. Compared to contractile machines targeting Gram-negative bacteria, major differences reside in the baseplate and contraction magnitude, consistent with target envelope differences. The multifunctional hub-hydrolase protein connects the tube and baseplate and is positioned to degrade peptidoglycan during penetration. The full-length tape measure protein forms a coiled-coil helix bundle homotrimer spanning the entire diffocin. Our study offers mechanical insights and principles for designing potent protein-based precision antibiotics.
History
DepositionNov 28, 2023-
Header (metadata) releaseAug 28, 2024-
Map releaseAug 28, 2024-
UpdateAug 28, 2024-
Current statusAug 28, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_42960.png

Downloads & links

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Map

FileDownload / File: emd_42960.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 320 pix.
= 352. Å		1.1 Å/pix.
x 320 pix.
= 352. Å		1.1 Å/pix.
x 320 pix.
= 352. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0115
Minimum - Maximum-0.020675337 - 0.039757427
Average (Standard dev.)0.000033219407 (±0.0024360355)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 352.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_42960_msk_1.map
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AxesZYX

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Half map: #2

Fileemd_42960_half_map_1.map
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Half map: #1

Fileemd_42960_half_map_2.map
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Sample components

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Entire : Diffocin

EntireName: Diffocin
Components
  • Complex: Diffocin
    • Protein or peptide: Sheath (CD1363)

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Supramolecule #1: Diffocin

SupramoleculeName: Diffocin / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Clostridioides difficile (bacteria)

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Macromolecule #1: Sheath (CD1363)

MacromoleculeName: Sheath (CD1363) / type: protein_or_peptide / ID: 1 / Number of copies: 30 / Enantiomer: LEVO
Source (natural)Organism: Clostridioides difficile (bacteria)
Molecular weightTheoretical: 39.26843 KDa
Recombinant expressionOrganism: Bacillus subtilis (bacteria)
SequenceString: MAIGLPSINI SFKELATTVK ERSARGIIAM VLKDAKALGL NEIHEKEDIP VDLSAENKEY INLALMGNVN TPNKLLVYVI EGEADIQTA LDFLETKEFN YLCMPKAVEA DKTAIKNWII KLRDIDKVKV KAVLGKVVGN HEGIINFTTE DVLVGEKKYS V DEFTSRVA ...String:
MAIGLPSINI SFKELATTVK ERSARGIIAM VLKDAKALGL NEIHEKEDIP VDLSAENKEY INLALMGNVN TPNKLLVYVI EGEADIQTA LDFLETKEFN YLCMPKAVEA DKTAIKNWII KLRDIDKVKV KAVLGKVVGN HEGIINFTTE DVLVGEKKYS V DEFTSRVA GLIAGTPLSQ SVTYTKLSDV VDIPKMTKVD AESRVNKGEL ILIKEAGAIR IARGVNSLTE LTAEKGEMFQ KI KIVDTLD IIHSDIRKVI IDDYIGKVTN SYDNKCLLIV AIKSYLEELE KSALIESDST VEIDFEAQKS YLKSKGVDLS YMT LQEIKE ANTGSKVFLK AKIKVLDAME DIDLSIEI

UniProtKB: Phage tail sheath 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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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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: 3.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 65376
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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