Evidence map›Paper›PMID 24623814›Full record

ArticleNucleic acids research2014

Key components of the eight classes of type IV secretion systems involved in bacterial conjugation or protein secretion.

Julien Guglielmini, Bertrand Néron, Sophie S Abby, María Pilar Garcillán-Barcia, Fernando de la Cruz, Eduardo P C Rocha

Abstract read
In one paragraph

Article in Nucleic acids research, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 124 papers.

0numbers the graph read from it
0cells of the map it votes in
124citing papers in PubMed
–field-weighted citation impact
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

124 citing papers in PubMed.

  1. Article
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  5. Isolation and identification ofFrontiers in cellular and infection microbiology · 2026
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  8. Article
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  10. The extended mobility of plasmids.Nucleic acids research · 2025
    Review
  11. Article
  12. Biology · 2025
    Review
  13. Article
  14. Article
  15. The type IV secretion system ofMicrobial genomics · 2025
    Article
  16. Article
  17. Review
  18. Article
  19. Pangenomic insights intoMicrobial genomics · 2024
    Article
  20. Article

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

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Julien GuglielminiMicrobial Evolutionary Genomics, Institut Pasteur, Paris 75015, France UMR3525, CNRS, Paris 75015, France jgugliel@pasteur.fr.
Bertrand NéronCentre d'Informatique pour les Biologistes, Institut Pasteur, Paris 75015, France.
Sophie S AbbyMicrobial Evolutionary Genomics, Institut Pasteur, Paris 75015, France UMR3525, CNRS, Paris 75015, France.
María Pilar Garcillán-BarciaInstitute of Biomedicine and Biotechnology of Cantabria (CSIC-Sodercan-University of Cantabria), Santander 39011, Spain.
Fernando de la CruzInstitute of Biomedicine and Biotechnology of Cantabria (CSIC-Sodercan-University of Cantabria), Santander 39011, Spain.
Eduardo P C RochaMicrobial Evolutionary Genomics, Institut Pasteur, Paris 75015, France UMR3525, CNRS, Paris 75015, France.

Funding

European Research Council 281605
6 · The paper itself

Abstract

Conjugation of DNA through a type IV secretion system (T4SS) drives horizontal gene transfer. Yet little is known on the diversity of these nanomachines. We previously found that T4SS can be divided in eight classes based on the phylogeny of the only ubiquitous protein of T4SS (VirB4). Here, we use an ab initio approach to identify protein families systematically and specifically associated with VirB4 in each class. We built profiles for these proteins and used them to scan 2262 genomes for the presence of T4SS. Our analysis led to the identification of thousands of occurrences of 116 protein families for a total of 1623 T4SS. Importantly, we could identify almost always in our profiles the essential genes of well-studied T4SS. This allowed us to build a database with the largest number of T4SS described to date. Using profile-profile alignments, we reveal many new cases of homology between components of distant classes of T4SS. We mapped these similarities on the T4SS phylogenetic tree and thus obtained the patterns of acquisition and loss of these protein families in the history of T4SS. The identification of the key VirB4-associated proteins paves the way toward experimental analysis of poorly characterized T4SS classes.

Indexed as

Conjugation, GeneticBacteriaBacterial ProteinsBacterial Secretion SystemsDatabases, GeneticGenes, BacterialGene Transfer, HorizontalGenome, BacterialPlasmidsSequence Homology, Nucleic AcidBacterial ProteinsBacterial Secretion Systems

Identifiers

PMID24623814
PMCPMC4027160

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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.