Evidence map›Paper›PMID 25024213›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2014

Structural plasticity of 4-α-helical bundles exemplified by the puzzle-like molecular assembly of the Rop protein.

Maria Amprazi, Dina Kotsifaki, Mary Providaki, Evangelia G Kapetaniou, Georgios Fellas, Ioannis Kyriazidis, Javier Pérez, Michael Kokkinidis

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.

0numbers the graph read from it
0cells of the map it votes in
12citing 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

12 citing papers in PubMed.

  1. Heptad insertion extends theBiodesign research · 2026
    Article
  2. Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Review
  8. Probing Protein Folding with Sequence-Reversed α-Helical Bundles.International journal of molecular sciences · 2021
    Article
  9. Article
  10. De novo design of covalently constrained mesosize protein scaffolds with unique tertiary structures.Proceedings of the National Academy of Sciences of the United States of America · 2017
    Article
  11. Article
  12. Article
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

8 authors.

Maria AmpraziDepartment of Biology, University of Crete, GR 71409 Heraklion, Crete, Greece;Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology, GR 70013 Heraklion, Crete, Greece; and.
Dina KotsifakiInstitute of Molecular Biology and Biotechnology, Foundation of Research and Technology, GR 70013 Heraklion, Crete, Greece; and.
Mary ProvidakiInstitute of Molecular Biology and Biotechnology, Foundation of Research and Technology, GR 70013 Heraklion, Crete, Greece; and.
Evangelia G KapetaniouInstitute of Molecular Biology and Biotechnology, Foundation of Research and Technology, GR 70013 Heraklion, Crete, Greece; and.
Georgios FellasDepartment of Biology, University of Crete, GR 71409 Heraklion, Crete, Greece;
Ioannis KyriazidisDepartment of Biology, University of Crete, GR 71409 Heraklion, Crete, Greece;
Javier PérezSynchrotron SOLEIL, 91192 Gif-sur-Yvette, France.
Michael KokkinidisDepartment of Biology, University of Crete, GR 71409 Heraklion, Crete, Greece;Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology, GR 70013 Heraklion, Crete, Greece; and kokkinid@imbb.forth.gr.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The dimeric Repressor of Primer (Rop) protein, a widely used model system for the study of coiled-coil 4-α-helical bundles, is characterized by a remarkable structural plasticity. Loop region mutations lead to a wide range of topologies, folding states, and altered physicochemical properties. A protein-folding study of Rop and several loop variants has identified specific residues and sequences that are linked to the observed structural plasticity. Apart from the native state, native-like and molten-globule states have been identified; these states are sensitive to reducing agents due to the formation of nonnative disulfide bridges. Pro residues in the loop are critical for the establishment of new topologies and molten globule states; their effects, however, can be in part compensated by Gly residues. The extreme plasticity in the assembly of 4-α-helical bundles reflects the capacity of the Rop sequence to combine a specific set of hydrophobic residues into strikingly different hydrophobic cores. These cores include highly hydrated ones that are consistent with the formation of interchain, nonnative disulfide bridges and the establishment of molten globules. Potential applications of this structural plasticity are among others in the engineering of bio-inspired materials.

Indexed as

Models, MolecularProtein FoldingBacterial ProteinsProtein Structure, SecondaryRNA-Binding ProteinsBacterial ProteinsRNA-Binding ProteinsRop protein, ColE1 plasmidcore packingdimensionless Kratky plotdisulfide bondsrecurrent tertiary motifs

Identifiers

PMID25024213
PMCPMC4121800

What OpenQuestion holds

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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.