Evidence map›Paper›PMID 19219048›Full record

ArticleNature structural & molecular biology2009

Cyanobacterial photosystem II at 2.9-A resolution and the role of quinones, lipids, channels and chloride.

Albert Guskov, Jan Kern, Azat Gabdulkhakov, Matthias Broser, Athina Zouni, Wolfram Saenger

Abstract read
PubMed Publisher
In one paragraph

Article in Nature structural & molecular biology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 354 papers.

0numbers the graph read from it
0cells of the map it votes in
354citing 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

354 citing papers in PubMed.

  1. Review
  2. Article
  3. Article
  4. Article
  5. The Evolution of Lipids from Solvents to Substrates.Annual review of biophysics · 2026
    Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. Review
  11. Review
  12. Review
  13. Article
  14. Microscopic basis of reaction center modulation in PsbA variants of photosystem II.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  15. Article
  16. Review
  17. Review
  18. Article
  19. Article
  20. Review

294 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.

Albert GuskovInstitut für Chemie und Biochemie/Kristallographie, Freie Universität Berlin, Takustrasse 6, D-14195 Berlin, Germany.
Jan Kern
Azat Gabdulkhakov
Matthias Broser
Athina Zouni
Wolfram Saenger

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Photosystem II (PSII) is a large homodimeric protein-cofactor complex located in the photosynthetic thylakoid membrane that acts as light-driven water:plastoquinone oxidoreductase. The crystal structure of PSII from Thermosynechococcus elongatus at 2.9-A resolution allowed the unambiguous assignment of all 20 protein subunits and complete modeling of all 35 chlorophyll a molecules and 12 carotenoid molecules, 25 integral lipids and 1 chloride ion per monomer. The presence of a third plastoquinone Q(C) and a second plastoquinone-transfer channel, which were not observed before, suggests mechanisms for plastoquinol-plastoquinone exchange, and we calculated other possible water or dioxygen and proton channels. Putative oxygen positions obtained from a Xenon derivative indicate a role for lipids in oxygen diffusion to the cytoplasmic side of PSII. The chloride position suggests a role in proton-transfer reactions because it is bound through a putative water molecule to the Mn(4)Ca cluster at a distance of 6.5 A and is close to two possible proton channels.

Indexed as

Protein Structure, QuaternaryBacterial ProteinsBinding SitesChloridesCrystallography, X-RayCyanobacteriaLipidsModels, MolecularPhotosystem II Protein ComplexProtein SubunitsQuinonesBacterial ProteinsChloridesLipidsPhotosystem II Protein ComplexProtein SubunitsQuinones

Identifiers

PMID19219048

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.