Evidence map›Paper›PMID 19946141›Full record

ReviewMicrobiology and molecular biology reviews : MMBR2009

Biological diversity of prokaryotic type IV secretion systems.

Cristina E Alvarez-Martinez, Peter J Christie

Abstract readReview
In one paragraph

Review in Microbiology and molecular biology reviews : MMBR, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 393 papers.

0numbers the graph read from it
0cells of the map it votes in
393citing papers in PubMed
31.3field-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

393 citing papers in PubMed, 706 citations in OpenAlex.

  1. Article
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  6. Review
  7. Article
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  10. Review
  11. The Integrative and Conjugative Element ICEThe Canadian journal of infectious diseases & medical microbiology = Journal canadien des maladies infectieuses et de la microbiologie medicale · 2026
    Article
  12. Review
  13. Structural and functional insights into Pseudomonas aeruginosa's secretion systems 1-6: regulation, role in microbial keratitis and drug targets.European journal of clinical microbiology & infectious diseases : official publication of the European Society of Clinical Microbiology · 2026
    Review
  14. Review
  15. International journal of molecular sciences · 2025
    Review
  16. Article
  17. Article
  18. Article
  19. Conjugative delivery of toxin genesJournal of bacteriology · 2025
    Article
  20. The extended mobility of plasmids.Nucleic acids research · 2025
    Review

333 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

2 authors at 1 institution in 1 country.

Cristina E Alvarez-MartinezDepartment of Microbiology and Molecular Genetics, University of Texas Medical School at Houston, 6431 Fannin, Houston, TX 77030, USA.
Peter J Christie
The University of Texas Health Science Center at Houston · US

Funding

TRANSLOCATION OF DNA ACROSS THE AGROBACTERIUM ENVELOPER01GM048746 · NIGMS · UNIVERSITY OF TEXAS HLTH SCI CTR HOUSTON · PI CHRISTIE, PETER J. · 1998 to 2018
$6.9M
TRANSLOCATION OF DNA ACROSS THE AGROBACTERIUM ENVELOPER29GM048746 · NIGMS · UNIVERSITY OF TEXAS HLTH SCI CTR HOUSTON · PI CHRISTIE, PETER J. · 1993 to 1997
–
NIGMS NIH HHS GM48746NIGMS NIH HHS R01 GM048746
6 · The paper itself

Abstract

Type IV secretion systems (T4SS) translocate DNA and protein substrates across prokaryotic cell envelopes generally by a mechanism requiring direct contact with a target cell. Three types of T4SS have been described: (i) conjugation systems, operationally defined as machines that translocate DNA substrates intercellularly by a contact-dependent process; (ii) effector translocator systems, functioning to deliver proteins or other macromolecules to eukaryotic target cells; and (iii) DNA release/uptake systems, which translocate DNA to or from the extracellular milieu. Studies of a few paradigmatic systems, notably the conjugation systems of plasmids F, R388, RP4, and pKM101 and the Agrobacterium tumefaciens VirB/VirD4 system, have supplied important insights into the structure, function, and mechanism of action of type IV secretion machines. Information on these systems is updated, with emphasis on recent exciting structural advances. An underappreciated feature of T4SS, most notably of the conjugation subfamily, is that they are widely distributed among many species of gram-negative and -positive bacteria, wall-less bacteria, and the Archaea. Conjugation-mediated lateral gene transfer has shaped the genomes of most if not all prokaryotes over evolutionary time and also contributed in the short term to the dissemination of antibiotic resistance and other virulence traits among medically important pathogens. How have these machines adapted to function across envelopes of distantly related microorganisms? A survey of T4SS functioning in phylogenetically diverse species highlights the biological complexity of these translocation systems and identifies common mechanistic themes as well as novel adaptations for specialized purposes relating to the modulation of the donor-target cell interaction.

Indexed as

BiodiversitySecretory PathwayAnimalsBacterial InfectionsBacterial ProteinsCrenarchaeotaDNAEvolution, MolecularGram-Negative BacteriaGram-Positive BacteriaHumansBacterial ProteinsDNA

Identifiers

PMID19946141
PMCPMC2786583
OpenAlexW1971912164

What OpenQuestion holds

Textmetadata
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.