Evidence map›Paper›PMID 30674920›Full record

ArticleScientific reports2019

Illuminating the catalytic core of ectoine synthase through structural and biochemical analysis.

Laura Czech, Astrid Höppner, Stefanie Kobus, Andreas Seubert, Ramona Riclea, Jeroen S Dickschat, Johann Heider, Sander H J Smits, Erhard Bremer

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
2.2field-weighted citation impact, top 12% 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

16 citing papers in PubMed, 39 citations in OpenAlex.

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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

9 authors at 3 institutions in 1 country.

Laura CzechDepartment of Biology, Laboratory for Microbiology, Philipps-University Marburg, D-35043, Marburg, Germany.ORCID 0000-0001-7398-1186
Astrid HöppnerCenter for Structural Studies, Heinrich-Heine-University Düsseldorf, D-40225, Düsseldorf, Germany.
Stefanie KobusCenter for Structural Studies, Heinrich-Heine-University Düsseldorf, D-40225, Düsseldorf, Germany.
Andreas SeubertDepartment of Chemistry, Analytical Chemistry, Philipps-University Marburg, D-35043, Marburg, Germany.
Ramona RicleaKekulé-Institute for Organic Chemistry and Biochemistry, Friedrich-Wilhelms-University Bonn, D-53121, Bonn, Germany.
Jeroen S DickschatKekulé-Institute for Organic Chemistry and Biochemistry, Friedrich-Wilhelms-University Bonn, D-53121, Bonn, Germany.
Johann HeiderDepartment of Biology, Laboratory for Microbiology, Philipps-University Marburg, D-35043, Marburg, Germany.
Sander H J SmitsCenter for Structural Studies, Heinrich-Heine-University Düsseldorf, D-40225, Düsseldorf, Germany. sander.smits@hhu.de.
Erhard BremerDepartment of Biology, Laboratory for Microbiology, Philipps-University Marburg, D-35043, Marburg, Germany. bremer@staff.uni-marburg.de.ORCID 0000-0002-2225-7005
Philipps University of Marburg · DEHeinrich Heine University Düsseldorf · DEUniversity of Bonn · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Ectoine synthase (EctC) is the signature enzyme for the production of ectoine, a compatible solute and chemical chaperone widely synthesized by bacteria as a cellular defense against the detrimental effects of osmotic stress. EctC catalyzes the last step in ectoine synthesis through cyclo-condensation of the EctA-formed substrate N-gamma-acetyl-L-2,4-diaminobutyric acid via a water elimination reaction. We have biochemically and structurally characterized the EctC enzyme from the thermo-tolerant bacterium Paenibacillus lautus (Pl). EctC is a member of the cupin superfamily and forms dimers, both in solution and in crystals. We obtained high-resolution crystal structures of the (Pl)EctC protein in forms that contain (i) the catalytically important iron, (ii) iron and the substrate N-gamma-acetyl-L-2,4-diaminobutyric acid, and (iii) iron and the enzyme reaction product ectoine. These crystal structures lay the framework for a proposal for the EctC-mediated water-elimination reaction mechanism. Residues involved in coordinating the metal, the substrate, or the product within the active site of ectoine synthase are highly conserved among a large group of EctC-type proteins. Collectively, the biochemical, mutational, and structural data reported here yielded detailed insight into the structure-function relationship of the (Pl)EctC enzyme and are relevant for a deeper understanding of the ectoine synthase family as a whole.

Indexed as

Catalytic DomainModels, MolecularAmino Acids, DiaminoAmino Acid SubstitutionBinding SitesHydro-LyasesIronMolecular Docking SimulationMolecular Dynamics SimulationProtein BindingProtein MultimerizationRecombinant ProteinsStructure-Activity RelationshipSubstrate SpecificityAmino Acids, Diaminoectoineectoine synthaseHydro-LyasesIronRecombinant Proteins

Identifiers

PMID30674920
PMCPMC6344544
OpenAlexW2915867013

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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.