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- EMDB-24735: Cryo-EM structure of the needle filament-tip complex of the Salmo... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-24735 | |||||||||
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Title | Cryo-EM structure of the needle filament-tip complex of the Salmonella type III secretion injectisome | |||||||||
![]() | Needle filament-tip complex of the Salmonella type III secretion injectisome | |||||||||
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![]() | protein secretion / bacterial pathogenesis / organelle assembly / CELL INVASION | |||||||||
Function / homology | ![]() type III protein secretion system complex / protein secretion by the type III secretion system / : / cell surface / extracellular region / identical protein binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.9 Å | |||||||||
![]() | Guo EZ / Galan JE | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of the needle filament tip complex of the type III secretion injectisome. Authors: Emily Z Guo / Jorge E Galán / ![]() Abstract: Type III secretion systems are multiprotein molecular machines required for the virulence of several important bacterial pathogens. The central element of these machines is the injectisome, a ∼5-Md ...Type III secretion systems are multiprotein molecular machines required for the virulence of several important bacterial pathogens. The central element of these machines is the injectisome, a ∼5-Md multiprotein structure that mediates the delivery of bacterially encoded proteins into eukaryotic target cells. The injectisome is composed of a cytoplasmic sorting platform, and a membrane-embedded needle complex, which is made up of a multiring base and a needle-like filament that extends several nanometers from the bacterial surface. The needle filament is capped at its distal end by another substructure known as the tip complex, which is crucial for the translocation of effector proteins through the eukaryotic cell plasma membrane. Here we report the cryo-EM structure of the Typhimurium needle tip complex docked onto the needle filament tip. Combined with a detailed analysis of structurally guided mutants, this study provides major insight into the assembly and function of this essential component of the type III secretion protein injection machine. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 12.4 KB 12.4 KB | Display Display | ![]() |
Images | ![]() | 64.7 KB | ||
Filedesc metadata | ![]() | 5.2 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 363.6 KB | Display | ![]() |
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Full document | ![]() | 363.2 KB | Display | |
Data in XML | ![]() | 5.6 KB | Display | |
Data in CIF | ![]() | 6.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7ryeMC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Needle filament-tip complex of the Salmonella type III secretion injectisome | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.715 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : The needle complex with tip
Entire | Name: The needle complex with tip |
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Components |
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-Supramolecule #1: The needle complex with tip
Supramolecule | Name: The needle complex with tip / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() Strain: SL1344 |
-Macromolecule #1: Protein PrgI
Macromolecule | Name: Protein PrgI / type: protein_or_peptide / ID: 1 / Number of copies: 19 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 8.864868 KDa |
Sequence | String: MATPWSGYLD DVSAKFDTGV DNLQTQVTEA LDKLAAKPSD PALLAAYQSK LSEYNLYRNA QSNTVKVFKD IDAAIIQNFR UniProtKB: SPI-1 type 3 secretion system needle filament protein |
-Macromolecule #2: Cell invasion protein SipD
Macromolecule | Name: Cell invasion protein SipD / type: protein_or_peptide / ID: 2 / Number of copies: 5 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 37.141148 KDa |
Sequence | String: MLNIQNYSAS PHPGIVAERP QTPSASEHVE TAVVPSTTEH RGTDIISLSQ AATKIHQAQQ TLQSTPPISE ENNDERTLAR QQLTSSLNA LAKSGVSLSA EQNENLRSAF SAPTSALFSA SPMAQPRTTI SDAEIWDMVS QNISAIGDSY LGVYENVVAV Y TDFYQAFS ...String: MLNIQNYSAS PHPGIVAERP QTPSASEHVE TAVVPSTTEH RGTDIISLSQ AATKIHQAQQ TLQSTPPISE ENNDERTLAR QQLTSSLNA LAKSGVSLSA EQNENLRSAF SAPTSALFSA SPMAQPRTTI SDAEIWDMVS QNISAIGDSY LGVYENVVAV Y TDFYQAFS DILSKMGGWL LPGKDGNTVK LDVTSLKNDL NSLVNKYNQI NSNTVLFPAQ SGSGVKVATE AEARQWLSEL NL PNSCLKS YGSGYVVTVD LTPLQKMVQD IDGLGAPGKD SKLEMDNAKY QAWQSGFKAQ EENMKTTLQT LTQKYSNANS LYD NLVKVL SSTISSSLET AKSFLQG UniProtKB: Cell invasion protein SipD |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R2/2 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.03 kPa / Details: 25 mAmp | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm |
Sample stage | Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: EMDB MAP EMDB ID: |
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Final reconstruction | Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 27737 |
Initial angle assignment | Type: NOT APPLICABLE |
Final angle assignment | Type: NOT APPLICABLE |
-Atomic model buiding 1
Refinement | Protocol: FLEXIBLE FIT / Overall B value: 85 |
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Output model | ![]() PDB-7rye: |