Evidence map›Paper›PMID 30397343›Full record

ArticleNature microbiology2019

Type IV CRISPR RNA processing and effector complex formation in Aromatoleum aromaticum.

Ahsen Özcan, Patrick Pausch, Andreas Linden, Alexander Wulf, Karola Schühle, Johann Heider, Henning Urlaub, Thomas Heimerl, Gert Bange, Lennart Randau

Open access · greenAbstract read
PubMed Publisher
In one paragraph

Article in Nature microbiology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers.

0numbers the graph read from it
0cells of the map it votes in
49citing papers in PubMed
4.6field-weighted citation impact, top 4% 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

49 citing papers in PubMed, 90 citations in OpenAlex.

  1. Review
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  3. Article
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  5. Review
  6. CRISPR-Cas Systems: A Functional Perspective and Innovations.International journal of molecular sciences · 2025
    Review
  7. Article
  8. Article
  9. Emerging tools in plant genome editing.Frontiers in genome editing · 2025
    Review
  10. Article
  11. Article
  12. Review
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  15. Article
  16. Article
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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

10 authors at 4 institutions in 1 country.

Ahsen ÖzcanMax Planck Institute for Terrestrial Microbiology, Marburg, Germany.
Patrick PauschLOEWE Center for Synthetic Microbiology (Synmikro), Philipps University Marburg, Marburg, Germany.ORCID http://orcid.org/0000-0001-8947-9107
Andreas LindenBioanalytics Research Group, Department of Clinical Chemistry, University Medical Centre, Göttingen, Germany.
Alexander WulfBioanalytical Mass Spectrometry Group, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.
Karola SchühleLaboratory for Microbiology, Department of Biology, Philipps-University Marburg, Marburg, Germany.
Johann HeiderLOEWE Center for Synthetic Microbiology (Synmikro), Philipps University Marburg, Marburg, Germany.
Henning UrlaubBioanalytics Research Group, Department of Clinical Chemistry, University Medical Centre, Göttingen, Germany.
Thomas HeimerlLOEWE Center for Synthetic Microbiology (Synmikro), Philipps University Marburg, Marburg, Germany.
Gert BangeLOEWE Center for Synthetic Microbiology (Synmikro), Philipps University Marburg, Marburg, Germany.
Lennart RandauMax Planck Institute for Terrestrial Microbiology, Marburg, Germany. lennart.randau@mpi-marburg.mpg.de.ORCID http://orcid.org/0000-0002-2780-2076
Philipps University of Marburg · DEMax Planck Institute for Biophysical Chemistry · DELoewe Center for Synthetic Microbiology · DEMax Planck Institute for Terrestrial Microbiology · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Type IV CRISPR-Cas modules belong to class 1 prokaryotic adaptive immune systems, which are defined by the presence of multisubunit effector complexes. They usually lack the known Cas proteins involved in adaptation and target cleavage, and their function has not been experimentally addressed. To investigate RNA and protein components of this CRISPR-Cas type, we located a complete type IV cas gene locus and an adjacent CRISPR array on a megaplasmid of Aromatoleum aromaticum EbN1, which contains an additional type I-C system on its chromosome. RNA sequencing analyses verified CRISPR RNA (crRNA) production and maturation for both systems. Type IV crRNAs were shown to harbour unusually short 7 nucleotide 5'-repeat tags and stable 3' hairpin structures. A unique Cas6 variant (Csf5) was identified that generates crRNAs that are specifically incorporated into type IV CRISPR-ribonucleoprotein (crRNP) complexes. Structures of RNA-bound Csf5 were obtained. Recombinant production and purification of the type IV Cas proteins, together with electron microscopy, revealed that Csf2 acts as a helical backbone for type IV crRNPs that include Csf5, Csf3 and a large subunit (Csf1). Mass spectrometry analyses identified protein-protein and protein-RNA contact sites. These results highlight evolutionary connections between type IV and type I CRISPR-Cas systems and demonstrate that type IV CRISPR-Cas systems employ crRNA-guided effector complexes.

Indexed as

Base SequenceClustered Regularly Interspaced Short Palindromic RepeatsCRISPR-Cas SystemsMass SpectrometryMicroscopy, ElectronPlasmidsRhodocyclaceaeRNA, BacterialRNA, Guide, CRISPR-Cas SystemsSequence Analysis, RNARNA, BacterialRNA, Guide, CRISPR-Cas Systems

Identifiers

PMID30397343
OpenAlexW2898118223

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.