Evidence map›Paper›PMID 29176862›Full record

ArticlePloS one2017

Plant-type phytoene desaturase: Functional evaluation of structural implications.

Julian Koschmieder, Mirjam Fehling-Kaschek, Patrick Schaub, Sandro Ghisla, Anton Brausemann, Jens Timmer, Peter Beyer

Open access · goldAbstract read
In one paragraph

Article in PloS one, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
1.8field-weighted citation impact, top 14% 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

25 citing papers in PubMed, 48 citations in OpenAlex.

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  10. Jasmonate ZIM Domain Protein (Plants (Basel, Switzerland) · 2024
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  17. Improved Sample Preparation and Optimized Solvent Extraction for Quantitation of Carotenoids.Plant foods for human nutrition (Dordrecht, Netherlands) · 2021
    Article
  18. Article
  19. Article
  20. 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

7 authors at 2 institutions in 1 country.

Julian KoschmiederUniversity of Freiburg, Faculty of Biology, Freiburg, Germany.
Mirjam Fehling-KaschekUniversity of Freiburg, Department of Physics, Freiburg, Germany.
Patrick SchaubUniversity of Freiburg, Faculty of Biology, Freiburg, Germany.
Sandro GhislaUniversity of Konstanz, Department of Biology, Konstanz, Germany.
Anton BrausemannUniversity of Freiburg, Institute for Biochemistry, Freiburg, Germany.
Jens TimmerUniversity of Freiburg, Department of Physics, Freiburg, Germany.
Peter BeyerUniversity of Freiburg, Faculty of Biology, Freiburg, Germany.ORCID http://orcid.org/0000-0003-0041-6543
University of Freiburg · DEUniversity of Konstanz · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Phytoene desaturase (PDS) is an essential plant carotenoid biosynthetic enzyme and a prominent target of certain inhibitors, such as norflurazon, acting as bleaching herbicides. PDS catalyzes the introduction of two double bonds into 15-cis-phytoene, yielding 9,15,9'-tri-cis-ζ-carotene via the intermediate 9,15-di-cis-phytofluene. We present the necessary data to scrutinize functional implications inferred from the recently resolved crystal structure of Oryza sativa PDS in a complex with norflurazon. Using dynamic mathematical modeling of reaction time courses, we support the relevance of homotetrameric assembly of the enzyme observed in crystallo by providing evidence for substrate channeling of the intermediate phytofluene between individual subunits at membrane surfaces. Kinetic investigations are compatible with an ordered ping-pong bi-bi kinetic mechanism in which the carotene and the quinone electron acceptor successively occupy the same catalytic site. The mutagenesis of a conserved arginine that forms a hydrogen bond with norflurazon, the latter competing with plastoquinone, corroborates the possibility of engineering herbicide resistance, however, at the expense of diminished catalytic activity. This mutagenesis also supports a "flavin only" mechanism of carotene desaturation not requiring charged residues in the active site. Evidence for the role of the central 15-cis double bond of phytoene in determining regio-specificity of carotene desaturation is presented.

Indexed as

BiocatalysisCarotenoidsChromatography, LiquidComputer SimulationEnzyme AssaysKineticsMass SpectrometryModels, MolecularMutationOryzaOxidoreductasesProtein MultimerizationPyridazinesStereoisomerismSubstrate SpecificityTime Factors(all-E) phytoeneCarotenoidsnorflurazoneOxidoreductasesphytoene dehydrogenasePyridazines

Identifiers

PMID29176862
PMCPMC5703498
OpenAlexW2770149636

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.