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- PDB-6rw9: Cryo-EM structure of Morganella morganii TcdA4 -

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Basic information

Entry
Database: PDB / ID: 6rw9
TitleCryo-EM structure of Morganella morganii TcdA4
ComponentsInsecticidal toxin protein TcdA4
KeywordsTOXIN / membrane permeation / translocation / complex
Function / homology
Function and homology information


TcA receptor binding domain / TcA receptor binding domain / Insecticidal toxin complex/plasmid virulence protein / Tc toxin complex TcA, C-terminal TcB-binding domain / Neuraminidase-like domain / Salmonella virulence plasmid 28.1kDa A protein / Tc toxin complex TcA C-terminal TcB-binding domain / Neuraminidase-like domain
Similarity search - Domain/homology
Insecticidal toxin protein
Similarity search - Component
Biological speciesMorganella morganii subsp. morganii (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.27 Å
AuthorsRoderer, D. / Leidreiter, F. / Gatsogiannis, C. / Meusch, D. / Benz, R. / Raunser, S.
Funding support Germany, 1items
OrganizationGrant numberCountry
European Research Council615984 Germany
CitationJournal: Sci Adv / Year: 2019
Title: Common architecture of Tc toxins from human and insect pathogenic bacteria.
Authors: F Leidreiter / D Roderer / D Meusch / C Gatsogiannis / R Benz / S Raunser /
Abstract: Tc toxins use a syringe-like mechanism to penetrate the membrane and translocate toxic enzymes into the host cytosol. They are composed of three components: TcA, TcB, and TcC. Low-resolution ...Tc toxins use a syringe-like mechanism to penetrate the membrane and translocate toxic enzymes into the host cytosol. They are composed of three components: TcA, TcB, and TcC. Low-resolution structures of TcAs from different bacteria suggest a considerable difference in their architecture and possibly in their mechanism of action. Here, we present high-resolution structures of five TcAs from insect and human pathogens, which show a similar overall composition and domain organization. Essential structural features, including a trefoil protein knot, are present in all TcAs, suggesting a common mechanism of action. All TcAs form functional pores and can be combined with TcB-TcC subunits from other species to form active chimeric holotoxins. We identified a conserved ionic pair that stabilizes the shell, likely operating as a strong latch that only springs open after destabilization of other regions. Our results provide new insights into the architecture and mechanism of the Tc toxin family.
History
DepositionJun 4, 2019Deposition site: PDBE / Processing site: PDBE
Revision 1.0Oct 23, 2019Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID

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Structure visualization

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Assembly

Deposited unit
A: Insecticidal toxin protein TcdA4
B: Insecticidal toxin protein TcdA4
C: Insecticidal toxin protein TcdA4
D: Insecticidal toxin protein TcdA4
E: Insecticidal toxin protein TcdA4


Theoretical massNumber of molelcules
Total (without water)1,378,2925
Polymers1,378,2925
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: scanning transmission electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area112320 Å2
ΔGint-494 kcal/mol
Surface area464920 Å2
MethodPISA

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Components

#1: Protein
Insecticidal toxin protein TcdA4


Mass: 275658.312 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Morganella morganii subsp. morganii (bacteria)
Gene: B9Z91_014765 / Production host: Escherichia coli (E. coli) / Variant (production host): RIPL / References: UniProt: A0A422U637*PLUS

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: M. morganii TcdA4 pentamer / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 1.4 MDa / Experimental value: NO
Source (natural)Organism: Morganella morganii subsp. morganii (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingAverage exposure time: 1.5 sec. / Electron dose: 60 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
IDNameCategory
2EPUimage acquisition
9PHENIXmodel refinement
10SPHIREinitial Euler assignment
11SPHIREfinal Euler assignment
13SPHIRE3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C5 (5 fold cyclic)
3D reconstructionResolution: 3.27 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 247513 / Symmetry type: POINT
Atomic model buildingPDB-ID: 1VW1

1vw1
PDB Unreleased entry

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