Evidence map›Paper›PMID 25644758›Full record

ArticleNature communications2015

Emergence of terpene cyclization in Artemisia annua.

Melissa Salmon, Caroline Laurendon, Maria Vardakou, Jitender Cheema, Marianne Defernez, Sol Green, Juan A Faraldos, Paul E O'Maille

Open access · goldAbstract read
In one paragraph

Article in Nature communications, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
3.5field-weighted citation impact, top 7% 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

26 citing papers in PubMed, 77 citations in OpenAlex.

  1. Article
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  3. Favorable epistasis in ancestral diterpene synthases promoted convergent evolution of a resin acid precursor in conifers.Proceedings of the National Academy of Sciences of the United States of America · 2025
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  8. Review
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  12. Mechanisms of protein evolution.Protein science : a publication of the Protein Society · 2022
    Review
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  15. 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

8 authors at 5 institutions in 2 countries.

Melissa SalmonJohn Innes Centre, Department of Metabolic Biology, Norwich Research Park, Norwich NR4 7UH, UK.
Caroline LaurendonJohn Innes Centre, Department of Metabolic Biology, Norwich Research Park, Norwich NR4 7UH, UK.
Maria VardakouJohn Innes Centre, Department of Metabolic Biology, Norwich Research Park, Norwich NR4 7UH, UK.
Jitender CheemaJohn Innes Centre, Computational and Systems Biology, Norwich Research Park, Norwich NR4 7UH, UK.
Marianne DefernezInstitute of Food Research, Analytical Sciences Unit, Norwich Research Park, Norwich NR4 7UA, UK.
Sol GreenPlant and Food Research, 120 Mt Albert Road, Sandringham, Auckland 1025, New Zealand.
Juan A FaraldosSchool of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
Paul E O'Maille1] John Innes Centre, Department of Metabolic Biology, Norwich Research Park, Norwich NR4 7UH, UK [2] Institute of Food Research, Food &Health Programme, Norwich Research Park, Norwich NR4 7UA, UK.
Norwich Research Park · GBJohn Innes Centre · GBCardiff University · GBPlant & Food Research · NZQuadram Institute · GB

Funding

Biotechnology and Biological Sciences Research Council BB/I015345/1Biotechnology and Biological Sciences Research Council BB/J004561/1Biotechnology and Biological Sciences Research Council BB/K003690/1
6 · The paper itself

Abstract

The emergence of terpene cyclization was critical to the evolutionary expansion of chemical diversity yet remains unexplored. Here we report the first discovery of an epistatic network of residues that controls the onset of terpene cyclization in Artemisia annua. We begin with amorpha-4,11-diene synthase (ADS) and (E)-β-farnesene synthase (BFS), a pair of terpene synthases that produce cyclic or linear terpenes, respectively. A library of ~27,000 enzymes is generated by breeding combinations of natural amino-acid substitutions from the cyclic into the linear producer. We discover one dominant mutation is sufficient to activate cyclization, and together with two additional residues comprise a network of strongly epistatic interactions that activate, suppress or reactivate cyclization. Remarkably, this epistatic network of equivalent residues also controls cyclization in a BFS homologue from Citrus junos. Fitness landscape analysis of mutational trajectories provides quantitative insights into a major epoch in specialized metabolism.

Indexed as

Alkyl and Aryl TransferasesArtemisia annuaCyclizationPyrophosphatasesTerpenesAlkyl and Aryl Transferasesamorpha-4,11-diene synthasebeta-farnesene synthasePyrophosphatasesTerpenes

Identifiers

PMID25644758
PMCPMC4327562
OpenAlexW2011254127

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.