Evidence map›Paper›PMID 24670658›Full record

ArticleNature2014

Structure of a type IV secretion system.

Harry H Low, Francesca Gubellini, Angel Rivera-Calzada, Nathalie Braun, Sarah Connery, Annick Dujeancourt, Fang Lu, Adam Redzej, Rémi Fronzes, Elena V Orlova and 1 more

Open access · greenAbstract read
In one paragraph

Article in Nature, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 165 papers.

0numbers the graph read from it
0cells of the map it votes in
165citing papers in PubMed
28.5field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

165 citing papers in PubMed, 306 citations in OpenAlex.

  1. Article
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  8. In situ structures of theProceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  9. Article
  10. Biology · 2025
    Review
  11. Article
  12. Review
  13. Article
  14. Article
  15. Review
  16. Article
  17. Structural Analysis of Protein Complexes by Cryo-Electron Microscopy.Methods in molecular biology (Clifton, N.J.) · 2024
    Review
  18. Comparative Analysis of T4SS Molecular Architectures.Journal of microbiology and biotechnology · 2023
    Review
  19. Article
  20. Article

105 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors at 4 institutions in 2 countries.

Harry H Low *Institute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Francesca Gubellini *Institut Pasteur, G5 Biologie structurale de la sécrétion bactérienne and UMR 3528-CNRS, 25 rue du Docteur Roux, 75015 Paris, France.
Angel Rivera-CalzadaInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Nathalie BraunInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Sarah ConneryInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Annick DujeancourtInstitut Pasteur, G5 Biologie structurale de la sécrétion bactérienne and UMR 3528-CNRS, 25 rue du Docteur Roux, 75015 Paris, France.
Fang LuInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Adam RedzejInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Rémi FronzesInstitut Pasteur, G5 Biologie structurale de la sécrétion bactérienne and UMR 3528-CNRS, 25 rue du Docteur Roux, 75015 Paris, France.
Elena V OrlovaInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Gabriel WaksmanInstitute of Structural and Molecular Biology, UCL and Birkbeck, Malet Street, London, WC1E 7HX, UK.
Institute of Structural and Molecular Biology · GBUniversity College London · GBCentre National de la Recherche Scientifique · FRInstitut Pasteur · FR

Funding

Medical Research Council MR/K012401/1Wellcome Trust 079605Wellcome Trust 098302
6 · The paper itself

Abstract

Bacterial type IV secretion systems translocate virulence factors into eukaryotic cells, distribute genetic material between bacteria and have shown potential as a tool for the genetic modification of human cells. Given the complex choreography of the substrate through the secretion apparatus, the molecular mechanism of the type IV secretion system has proved difficult to dissect in the absence of structural data for the entire machinery. Here we use electron microscopy to reconstruct the type IV secretion system encoded by the Escherichia coli R388 conjugative plasmid. We show that eight proteins assemble in an intricate stoichiometric relationship to form an approximately 3 megadalton nanomachine that spans the entire cell envelope. The structure comprises an outer membrane-associated core complex connected by a central stalk to a substantial inner membrane complex that is dominated by a battery of 12 VirB4 ATPase subunits organized as side-by-side hexameric barrels. Our results show a secretion system with markedly different architecture, and consequently mechanism, to other known bacterial secretion systems.

Indexed as

Bacterial Secretion SystemsAdenosine TriphosphatasesCell MembraneEscherichia coliEscherichia coli ProteinsMicroscopy, ElectronModels, MolecularMultiprotein ComplexesAdenosine TriphosphatasesBacterial Secretion SystemsEscherichia coli ProteinsMultiprotein Complexes

Identifiers

PMID24670658
PMCPMC3998870
OpenAlexW2081664254

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.