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- EMDB-12032: Cryo-EM structure of the contractile injection system crown trime... -

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Basic information

Entry
Database: EMDB / ID: EMD-12032
TitleCryo-EM structure of the contractile injection system crown trimer from Anabaena PCC7120
Map data
Sample
  • Complex: Base plate complex (C1) of the Anabaena PCC7120 contractile injection system
Biological speciesNostoc sp. PCC 7120 = FACHB-418 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsEisenstein F / Weiss GL / Pilhofer M
CitationJournal: Nat Microbiol / Year: 2022
Title: Structure of a thylakoid-anchored contractile injection system in multicellular cyanobacteria.
Authors: Gregor L Weiss / Fabian Eisenstein / Ann-Katrin Kieninger / Jingwei Xu / Hannah A Minas / Milena Gerber / Miki Feldmüller / Iris Maldener / Karl Forchhammer / Martin Pilhofer /
Abstract: Contractile injection systems (CISs) mediate cell-cell interactions by phage tail-like structures, using two distinct modes of action: extracellular CISs are released into the medium, while type 6 ...Contractile injection systems (CISs) mediate cell-cell interactions by phage tail-like structures, using two distinct modes of action: extracellular CISs are released into the medium, while type 6 secretion systems (T6SSs) are attached to the cytoplasmic membrane and function upon cell-cell contact. Here, we characterized a CIS in the multicellular cyanobacterium Anabaena, with features distinct from extracellular CISs and T6SSs. Cryo-electron tomography of focused ion beam-milled cells revealed that CISs were anchored in thylakoid membrane stacks, facing the cell periphery. Single particle cryo-electron microscopy showed that this unique in situ localization was mediated by extensions of tail fibre and baseplate components. On stress, cyanobacteria induced the formation of ghost cells, presenting thylakoid-anchored CISs to the environment. Functional assays suggest that these CISs may mediate ghost cell formation and/or interactions of ghost cells with other organisms. Collectively, these data provide a framework for understanding the evolutionary re-engineering of CISs and potential roles of these CISs in cyanobacterial programmed cell death.
History
DepositionDec 3, 2020-
Header (metadata) releaseFeb 23, 2022-
Map releaseFeb 23, 2022-
UpdateMar 16, 2022-
Current statusMar 16, 2022Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.05
  • Imaged by UCSF Chimera
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Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_12032.png

Downloads & links

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Map

FileDownload / File: emd_12032.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 512 pix.
= 563.2 Å		1.1 Å/pix.
x 512 pix.
= 563.2 Å		1.1 Å/pix.
x 512 pix.
= 563.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.05 / Movie #1: 0.05
Minimum - Maximum-0.08522998 - 0.16665865
Average (Standard dev.)0.0008451743 (±0.0045526186)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 563.2 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.11.11.1
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z563.200563.200563.200
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS512512512
D min/max/mean-0.0850.1670.001

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Supplemental data

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Mask #1

Fileemd_12032_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_12032_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_12032_half_map_2.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Base plate complex (C1) of the Anabaena PCC7120 contractile injec...

EntireName: Base plate complex (C1) of the Anabaena PCC7120 contractile injection system
Components
  • Complex: Base plate complex (C1) of the Anabaena PCC7120 contractile injection system

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Supramolecule #1: Base plate complex (C1) of the Anabaena PCC7120 contractile injec...

SupramoleculeName: Base plate complex (C1) of the Anabaena PCC7120 contractile injection system
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#11 / Details: focussed on crown trimer
Source (natural)Organism: Nostoc sp. PCC 7120 = FACHB-418 (bacteria)

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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: 7.5
GridModel: Quantifoil / Support film - Material: CARBON / Support film - topology: CONTINUOUS
VitrificationCryogen name: ETHANE-PROPANE / Chamber humidity: 100 % / Chamber temperature: 281 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 4 / Number real images: 19000 / Average electron dose: 52.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated defocus max: 1.5 µm / Calibrated defocus min: 0.9 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 228163
CTF correctionSoftware - Name: Gctf
Startup modelType of model: OTHER / Details: related structure
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Details: using spherical alignment mask / Number images used: 288285
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final 3D classificationNumber classes: 10 / Software - Name: RELION (ver. 3.0)
Details: focussed 3D classification after symmetry expansion with spherical mask on crown trimer
FSC plot (resolution estimation)

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