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- EMDB-20043: Helical reconstruction of Type III Secretion System Needle filame... -

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Basic information

Entry
Database: EMDB / ID: EMD-20043
TitleHelical reconstruction of Type III Secretion System Needle filament mutant-PrgI S49A
Map datain vitro polymerized PrgI S49A filaments
Sample
  • Complex: PrgI S49A
    • Protein or peptide: Protein PrgI
KeywordsType III secretion / helical reconstruction / PrgI filament / salmonella / PROTEIN TRANSPORT
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
Type III secretion system apparatus / SPI-1 type 3 secretion system needle filament protein
Similarity search - Component
Biological speciesSalmonella typhimurium (strain SL1344) (bacteria)
Methodhelical reconstruction / cryo EM / Resolution: 3.61 Å
AuthorsGuo EZ / Galan JE
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI030492 United States
CitationJournal: PLoS Biol / Year: 2019
Title: A polymorphic helix of a Salmonella needle protein relays signals defining distinct steps in type III secretion.
Authors: Emily Z Guo / Daniel C Desrosiers / Jan Zalesak / James Tolchard / Mélanie Berbon / Birgit Habenstein / Thomas Marlovits / Antoine Loquet / Jorge E Galán /
Abstract: Type III protein-secretion machines are essential for the interactions of many pathogenic or symbiotic bacterial species with their respective eukaryotic hosts. The core component of these machines ...Type III protein-secretion machines are essential for the interactions of many pathogenic or symbiotic bacterial species with their respective eukaryotic hosts. The core component of these machines is the injectisome, a multiprotein complex that mediates the selection of substrates, their passage through the bacterial envelope, and ultimately their delivery into eukaryotic target cells. The injectisome is composed of a large cytoplasmic complex or sorting platform, a multiring base embedded in the bacterial envelope, and a needle-like filament that protrudes several nanometers from the bacterial surface and is capped at its distal end by the tip complex. A characteristic feature of these machines is that their activity is stimulated by contact with target host cells. The sensing of target cells, thought to be mediated by the distal tip of the needle filament, generates an activating signal that must be transduced to the secretion machine by the needle filament. Here, through a multidisciplinary approach, including solid-state NMR (SSNMR) and cryo electron microscopy (cryo-EM) analyses, we have identified critical residues of the needle filament protein of a Salmonella Typhimurium type III secretion system that are involved in the regulation of the activity of the secretion machine. We found that mutations in the needle filament protein result in various specific phenotypes associated with different steps in the type III secretion process. More specifically, these studies reveal an important role for a polymorphic helix of the needle filament protein and the residues that line the lumen of its central channel in the control of type III secretion.
History
DepositionMar 29, 2019-
Header (metadata) releaseApr 10, 2019-
Map releaseJul 10, 2019-
UpdateMay 14, 2025-
Current statusMay 14, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6ofe
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6ofe
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20043.png

Downloads & links

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Map

FileDownload / File: emd_20043.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationin vitro polymerized PrgI S49A filaments
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 256 pix.
= 267.52 Å		1.05 Å/pix.
x 256 pix.
= 267.52 Å		1.05 Å/pix.
x 256 pix.
= 267.52 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.045 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.026 / Movie #1: 0.026
Minimum - Maximum-0.05316718 - 0.100388534
Average (Standard dev.)0.00028997037 (±0.0036552488)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 267.52 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0451.0451.045
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z267.520267.520267.520
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.0530.1000.000

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Supplemental data

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Sample components

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Entire : PrgI S49A

EntireName: PrgI S49A
Components
  • Complex: PrgI S49A
    • Protein or peptide: Protein PrgI

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Supramolecule #1: PrgI S49A

SupramoleculeName: PrgI S49A / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all / Details: single mutant of PrgI
Source (natural)Organism: Salmonella typhimurium (strain SL1344) (bacteria)

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Macromolecule #1: Protein PrgI

MacromoleculeName: Protein PrgI / type: protein_or_peptide / ID: 1 / Number of copies: 20 / Enantiomer: LEVO
Source (natural)Organism: Salmonella typhimurium (strain SL1344) (bacteria) / Strain: SL1344
Molecular weightTheoretical: 9.131145 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
GSHMATPWSG YLDDVSAKFD TGVDNLQTQV TEALDKLAAK PSDPALLAAY QAKLSEYNLY RNAQSNTVKV FKDIDAAIIQ NFR

UniProtKB: Type III secretion system apparatus

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statefilament

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Sample preparation

BufferpH: 7.5
GridDetails: unspecified
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 47.2 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Helical parameters - Δz: 4.19 Å
Applied symmetry - Helical parameters - Δ&Phi: 63.35 °
Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric)
Resolution.type: BY AUTHOR / Resolution: 3.61 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 14070
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final angle assignmentType: NOT APPLICABLE

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