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- PDB-6rwx: Periplasmic inner membrane ring of the Shigella type 3 secretion ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6rwx | |||||||||
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Title | Periplasmic inner membrane ring of the Shigella type 3 secretion system | |||||||||
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![]() | PROTEIN TRANSPORT / type 3 secretion system / shigella / ring-forming membrane protein | |||||||||
Function / homology | ![]() | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.55 Å | |||||||||
![]() | Kamprad, A. / Lunelli, M. | |||||||||
Funding support | 2items
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![]() | ![]() Title: Cryo-EM structure of the Shigella type III needle complex. Authors: Michele Lunelli / Antje Kamprad / Jörg Bürger / Thorsten Mielke / Christian M T Spahn / Michael Kolbe / ![]() Abstract: The Type III Secretion Systems (T3SS) needle complex is a conserved syringe-shaped protein translocation nanomachine with a mass of about 3.5 MDa essential for the survival and virulence of many Gram- ...The Type III Secretion Systems (T3SS) needle complex is a conserved syringe-shaped protein translocation nanomachine with a mass of about 3.5 MDa essential for the survival and virulence of many Gram-negative bacterial pathogens. This system is composed of a membrane-embedded basal body and an extracellular needle that deliver effector proteins into host cells. High-resolution structures of the T3SS from different organisms and infection stages are needed to understand the underlying molecular mechanisms of effector translocation. Here, we present the cryo-electron microscopy structure of the isolated Shigella T3SS needle complex. The inner membrane (IM) region of the basal body adopts 24-fold rotational symmetry and forms a channel system that connects the bacterial periplasm with the export apparatus cage. The secretin oligomer adopts a heterogeneous architecture with 16- and 15-fold cyclic symmetry in the periplasmic N-terminal connector and C-terminal outer membrane ring, respectively. Two out of three IM subunits bind the secretin connector via a β-sheet augmentation. The cryo-EM map also reveals the helical architecture of the export apparatus core, the inner rod, the needle and their intervening interfaces. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 1.5 MB | Display | ![]() |
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PDB format | ![]() | 1.3 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 10045MC ![]() 6rwkC ![]() 6rwyC C: citing same article ( M: map data used to model this data |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 43053.844 Da / Num. of mol.: 24 / Source method: isolated from a natural source / Source: (natural) ![]() #2: Protein | Mass: 27542.055 Da / Num. of mol.: 24 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: The periplasmic inner membrane ring of the Shigella type 3 secretion system Type: COMPLEX Details: Focused reconstruction from isolated needle complexes of the Shigella type 3 secretion system Entity ID: all / Source: NATURAL |
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Molecular weight | Units: MEGADALTONS / Experimental value: NO |
Source (natural) | Organism: ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Isolated needle complex in detergent solution |
Specimen support | Grid material: COPPER / Grid type: Quantifoil R2/1 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K Details: Sample applied on grid 5 ul, incubation time 5 min on ice, then moved into Vitrobot and 5 ul sample applied again. Blot time: 2 sec Blot force: -2 Drain time: 0 sec |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 101179 X / Nominal defocus max: 4 nm / Nominal defocus min: 1.5 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 1.5 sec. / Electron dose: 25 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5238 |
Image scans | Width: 4096 / Height: 4096 / Movie frames/image: 7 |
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Processing
Software | Name: PHENIX / Version: 1.13_2998: / Classification: refinement | ||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 171833 | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C24 (24 fold cyclic) | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.55 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 72298 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | B value: 140 / Protocol: AB INITIO MODEL / Space: REAL / Target criteria: Correlation coefficient and geometry Details: Model was built and refined in the map low-pass filtered at 3.2 A | ||||||||||||||||||||||||||||||||||||||||
Atomic model building |
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Refine LS restraints |
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