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- EMDB-4734: Structure of the core Shigella flexneri type III secretion system... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-4734 | ||||||||||||||||||
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Title | Structure of the core Shigella flexneri type III secretion system export gate complex SctRST (Spa24/Spa9/Spa29). | ||||||||||||||||||
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![]() | Type III secretion / T3SS / Flagella / Cryo-EM / Membrane protein / Protein transport | ||||||||||||||||||
Function / homology | ![]() | ||||||||||||||||||
Biological species | ![]() | ||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||||||||||||||
![]() | Johnson S / Kuhlen L | ||||||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structure of the core of the type III secretion system export apparatus. Authors: Lucas Kuhlen / Patrizia Abrusci / Steven Johnson / Joseph Gault / Justin Deme / Joseph Caesar / Tobias Dietsche / Mehari Tesfazgi Mebrhatu / Tariq Ganief / Boris Macek / Samuel Wagner / ...Authors: Lucas Kuhlen / Patrizia Abrusci / Steven Johnson / Joseph Gault / Justin Deme / Joseph Caesar / Tobias Dietsche / Mehari Tesfazgi Mebrhatu / Tariq Ganief / Boris Macek / Samuel Wagner / Carol V Robinson / Susan M Lea / ![]() ![]() Abstract: Export of proteins through type III secretion systems is critical for motility and virulence of many major bacterial pathogens. Three putative integral membrane proteins (FliP, FliQ, FliR) are ...Export of proteins through type III secretion systems is critical for motility and virulence of many major bacterial pathogens. Three putative integral membrane proteins (FliP, FliQ, FliR) are suggested to form the core of an export gate in the inner membrane, but their structure, assembly and location within the final nanomachine remain unclear. Here, we present the cryoelectron microscopy structure of the Salmonella Typhimurium FliP-FliQ-FliR complex at 4.2 Å. None of the subunits adopt canonical integral membrane protein topologies, and common helix-turn-helix structural elements allow them to form a helical assembly with 5:4:1 stoichiometry. Fitting of the structure into reconstructions of intact secretion systems, combined with cross-linking, localize the export gate as a core component of the periplasmic portion of the machinery. This study thereby identifies the export gate as a key element of the secretion channel and implies that it primes the helical architecture of the components assembling downstream. | ||||||||||||||||||
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 | ![]() | 70.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.1 KB 24.1 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 10.3 KB | Display | ![]() |
Images | ![]() | 59.8 KB | ||
Masks | ![]() | 91.1 MB | ![]() | |
Filedesc metadata | ![]() | 6.5 KB | ||
Others | ![]() ![]() ![]() | 6.8 MB 71.3 MB 71.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6r6bMC ![]() 4733C ![]() 6r69C C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.822 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Mask #1
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-Additional map: #1
File | emd_4734_additional.map | ||||||||||||
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-Half map: None
File | emd_4734_half_map_1.map | ||||||||||||
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-Half map: None
File | emd_4734_half_map_2.map | ||||||||||||
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Annotation | None | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Shigella flexneri type III secretion export gate (Spa24Spa9Spa29)
Entire | Name: Shigella flexneri type III secretion export gate (Spa24Spa9Spa29) |
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Components |
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-Supramolecule #1: Shigella flexneri type III secretion export gate (Spa24Spa9Spa29)
Supramolecule | Name: Shigella flexneri type III secretion export gate (Spa24Spa9Spa29) type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 191 KDa |
-Macromolecule #1: Surface presentation of antigens protein SpaP
Macromolecule | Name: Surface presentation of antigens protein SpaP / type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 24.215562 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MLSDMSLIAT LSFFTLLPFL VAAGTCYIKF SIVFVMVRNA LGLQQVPSNM TLNGIALIMA LFVMKPIIEA GYENYLNGPQ KFDTISDIV RFSDSGLMEY KQYLKKHTDL ELARFFQRSE EENADLKSAE NNDYSLFSLL PAYALSEIKD AFKIGFYLYL P FVVVDLVI ...String: MLSDMSLIAT LSFFTLLPFL VAAGTCYIKF SIVFVMVRNA LGLQQVPSNM TLNGIALIMA LFVMKPIIEA GYENYLNGPQ KFDTISDIV RFSDSGLMEY KQYLKKHTDL ELARFFQRSE EENADLKSAE NNDYSLFSLL PAYALSEIKD AFKIGFYLYL P FVVVDLVI SSILLALGMM MMSPITISVP IKLVLFVALD GWGILSKALI EQYINIPA UniProtKB: Surface presentation of antigens protein SpaP |
-Macromolecule #2: Surface presentation of antigens protein SpaR
Macromolecule | Name: Surface presentation of antigens protein SpaR / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 32.644086 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MDISSWFESI HVFLILLNGV FFRLAPLFFF LPFLNNGIIS PSIRIPVIFL VASGLITSGK VDIGSSVFEH VYFLMFKEII VGLLLSFCL SLPFWIFHAV GSIIDNQRGA TLSSSIDPAN GVDTSELAKF FNLFSAVVFL YSGGMVFILE SIQLSYNICP L FSQCSFRI ...String: MDISSWFESI HVFLILLNGV FFRLAPLFFF LPFLNNGIIS PSIRIPVIFL VASGLITSGK VDIGSSVFEH VYFLMFKEII VGLLLSFCL SLPFWIFHAV GSIIDNQRGA TLSSSIDPAN GVDTSELAKF FNLFSAVVFL YSGGMVFILE SIQLSYNICP L FSQCSFRI SNILTFLTLL ASQAVILASP VMIVLLLSEV LLGVLSRFAP QMNAFSVSLT IKSLLAIFII FICSSTIYFS KV QFFLGEH KFFTNLFVRE NLYFQGQFGS WSHPQFEKGG GSGGGSGGGS WSHPQFEK UniProtKB: Surface presentation of antigens protein SpaR |
-Macromolecule #3: Surface presentation of antigens protein SpaQ
Macromolecule | Name: Surface presentation of antigens protein SpaQ / type: protein_or_peptide / ID: 3 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 9.433338 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSDIVYMGNK ALYLILIFSL WPVGIATVIG LSIGLLQTVT QLQEQTLPFG IKLIGVSISL LLLSGWYGEV LLSFCHEIMF LIKSGV UniProtKB: Surface presentation of antigens protein SpaQ |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 8.4 mg/mL | ||||||||
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Buffer | pH: 8 Component:
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Grid | Model: Quantifoil, UltrAuFoil, R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. | ||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 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: COUNTING / Number real images: 3741 / Average exposure time: 8.0 sec. / Average electron dose: 48.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD |
Sample stage | Specimen 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
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: AB INITIO MODEL |
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Output model | ![]() PDB-6r6b: |