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- EMDB-8924: Structure of the Salmonella SPI-1 type III secretion injectisome ... -

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Basic information

Entry
Database: EMDB / ID: EMD-8924
TitleStructure of the Salmonella SPI-1 type III secretion injectisome needle filament
Map dataCryo-EM reconstruction of the Salmonella SPI-1 type III secretion injectisome needle filament
Sample
  • Complex: PrgI helical filament
    • Protein or peptide: Protein PrgI
KeywordsType III secretion system / MEMBRANE PROTEIN
Function / homology
Function and homology information


type III protein secretion system complex / protein secretion by the type III secretion system / cell surface / extracellular region / identical protein binding
Similarity search - Function
Type III secretion, needle-protein-like / Type III secretion, needle-protein-like superfamily / Type III secretion needle MxiH, YscF, SsaG, EprI, PscF, EscF / Type III secretion system, needle protein
Similarity search - Domain/homology
SPI-1 type 3 secretion system needle filament protein
Similarity search - Component
Biological speciesSalmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsHu J / Hong C
Funding support Canada, United States, 2 items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR) Canada
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Nat Commun / Year: 2018
Title: Cryo-EM analysis of the T3S injectisome reveals the structure of the needle and open secretin.
Authors: J Hu / L J Worrall / C Hong / M Vuckovic / C E Atkinson / N Caveney / Z Yu / N C J Strynadka /
Abstract: The bacterial type III secretion system, or injectisome, is a syringe shaped nanomachine essential for the virulence of many disease causing Gram-negative bacteria. At the core of the injectisome ...The bacterial type III secretion system, or injectisome, is a syringe shaped nanomachine essential for the virulence of many disease causing Gram-negative bacteria. At the core of the injectisome structure is the needle complex, a continuous channel formed by the highly oligomerized inner and outer membrane hollow rings and a polymerized helical needle filament which spans through and projects into the infected host cell. Here we present the near-atomic resolution structure of a needle complex from the prototypical Salmonella Typhimurium SPI-1 type III secretion system, with local masking protocols allowing for model building and refinement of the major membrane spanning components of the needle complex base in addition to an isolated needle filament. This work provides significant insight into injectisome structure and assembly and importantly captures the molecular basis for substrate induced gating in the giant outer membrane secretin portal family.
History
DepositionJun 26, 2018-
Header (metadata) releaseJul 18, 2018-
Map releaseOct 3, 2018-
UpdateMar 13, 2024-
Current statusMar 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.15
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.15
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6dwb
  • Surface level: 0.15
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_8924.png

Downloads & links

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Map

FileDownload / File: emd_8924.map.gz / Format: CCP4 / Size: 12.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM reconstruction of the Salmonella SPI-1 type III secretion injectisome needle filament
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.35 Å/pix.
x 150 pix.
= 202.5 Å		1.35 Å/pix.
x 150 pix.
= 202.5 Å		1.35 Å/pix.
x 150 pix.
= 202.5 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.35 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.15 / Movie #1: 0.15
Minimum - Maximum-0.30631834 - 0.45603895
Average (Standard dev.)0.0032581054 (±0.025642771)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions150150150
Spacing150150150
CellA=B=C: 202.5 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.351.351.35
M x/y/z150150150
origin x/y/z0.0000.0000.000
length x/y/z202.500202.500202.500
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS150150150
D min/max/mean-0.3060.4560.003

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Supplemental data

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Sample components

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Entire : PrgI helical filament

EntireName: PrgI helical filament
Components
  • Complex: PrgI helical filament
    • Protein or peptide: Protein PrgI

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Supramolecule #1: PrgI helical filament

SupramoleculeName: PrgI helical filament / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)

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Macromolecule #1: Protein PrgI

MacromoleculeName: Protein PrgI / type: protein_or_peptide / ID: 1 / Number of copies: 30 / Enantiomer: LEVO
Source (natural)Organism: Salmonella enterica subsp. enterica serovar Typhimurium (bacteria)
Molecular weightTheoretical: 8.864868 KDa
SequenceString:
MATPWSGYLD DVSAKFDTGV DNLQTQVTEA LDKLAAKPSD PALLAAYQSK LSEYNLYRNA QSNTVKVFKD IDAAIIQNFR

UniProtKB: SPI-1 type 3 secretion system needle filament protein

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statefilament

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Sample preparation

Concentration0.7 mg/mL
BufferpH: 8
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsSpherical aberration corrector: Cs corrector was used. / Energy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-40 / Number grids imaged: 1 / Number real images: 3753 / Average exposure time: 0.25 sec. / Average electron dose: 55.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated defocus max: 2.6 µm / Calibrated defocus min: 1.1 µm / Calibrated magnification: 37037 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 0.01 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.2 µm / Nominal magnification: 81000
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: 88687
Startup modelType of model: OTHER / Details: cylindrical density
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 53000
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationNumber classes: 4 / Software - Name: RELION

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-6dwb:
Structure of the Salmonella SPI-1 type III secretion injectisome needle filament

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