Evidence map›Paper›PMID 19390696›Full record

ArticlePLoS pathogens2009

Sequence-based prediction of type III secreted proteins.

Roland Arnold, Stefan Brandmaier, Frederick Kleine, Patrick Tischler, Eva Heinz, Sebastian Behrens, Antti Niinikoski, Hans-Werner Mewes, Matthias Horn, Thomas Rattei

Erratum issuedAbstract read
In one paragraph

Article in PLoS pathogens, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 162 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
162citing papers in PubMed, 1 pooled it
–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

162 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Article
  3. Evolution of N-terminal mechanical lability as a determinant for Type III secretion.Protein science : a publication of the Protein Society · 2026
    Article
  4. Article
  5. Genomic Basis of Lifestyle Divergence in Rice-AssociatedInternational journal of molecular sciences · 2026
    Article
  6. Article
  7. Article
  8. Article
  9. Genomic characterization and niche adaptive analysis ofFrontiers in cellular and infection microbiology · 2026
    Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. A conservedMicrobiology (Reading, England) · 2025
    Article
  16. Review
  17. Artificial Intelligence Methods in Infection Biology Research.Methods in molecular biology (Clifton, N.J.) · 2025
    Article
  18. Article
  19. Article
  20. Protein Sorting Prediction.Methods in molecular biology (Clifton, N.J.) · 2024
    Article

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

4 · The record

Corrections and comments

  • Erratum issued
5 · Who and what money

Authors and funding

10 authors.

Roland ArnoldDepartment of Genome Oriented Bioinformatics, Technische Universität München, Wissenschaftszentrum Weihenstephan, Freising, Germany.
Stefan Brandmaier
Frederick Kleine
Patrick Tischler
Eva Heinz
Sebastian Behrens
Antti Niinikoski
Hans-Werner Mewes
Matthias Horn
Thomas Rattei

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The type III secretion system (TTSS) is a key mechanism for host cell interaction used by a variety of bacterial pathogens and symbionts of plants and animals including humans. The TTSS represents a molecular syringe with which the bacteria deliver effector proteins directly into the host cell cytosol. Despite the importance of the TTSS for bacterial pathogenesis, recognition and targeting of type III secreted proteins has up until now been poorly understood. Several hypotheses are discussed, including an mRNA-based signal, a chaperon-mediated process, or an N-terminal signal peptide. In this study, we systematically analyzed the amino acid composition and secondary structure of N-termini of 100 experimentally verified effector proteins. Based on this, we developed a machine-learning approach for the prediction of TTSS effector proteins, taking into account N-terminal sequence features such as frequencies of amino acids, short peptides, or residues with certain physico-chemical properties. The resulting computational model revealed a strong type III secretion signal in the N-terminus that can be used to detect effectors with sensitivity of approximately 71% and selectivity of approximately 85%. This signal seems to be taxonomically universal and conserved among animal pathogens and plant symbionts, since we could successfully detect effector proteins if the respective group was excluded from training. The application of our prediction approach to 739 complete bacterial and archaeal genome sequences resulted in the identification of between 0% and 12% putative TTSS effector proteins. Comparison of effector proteins with orthologs that are not secreted by the TTSS showed no clear pattern of signal acquisition by fusion, suggesting convergent evolutionary processes shaping the type III secretion signal. The newly developed program EffectiveT3 (http://www.chlamydiaedb.org) is the first universal in silico prediction program for the identification of novel TTSS effectors. Our findings will facilitate further studies on and improve our understanding of type III secretion and its role in pathogen-host interactions.

Indexed as

Amino Acid SequenceArtificial IntelligenceBacterial ProteinsChlamydiaComputational BiologyConserved SequenceDatabases, ProteinEscherichiaEvolution, MolecularGram-Negative BacteriaProtein Sorting SignalsProtein Structure, SecondarySalmonellaYersiniaBacterial ProteinsProtein Sorting Signals

Identifiers

PMID19390696
PMCPMC2669295

What OpenQuestion holds

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Registered trials

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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.