Evidence map›Paper›PMID 31040279›Full record

ArticleNature communications2019

4-Coumarate 3-hydroxylase in the lignin biosynthesis pathway is a cytosolic ascorbate peroxidase.

Jaime Barros, Luis Escamilla-Trevino, Luhua Song, Xiaolan Rao, Juan Carlos Serrani-Yarce, Maite Docampo Palacios, Nancy Engle, Feroza K Choudhury, Timothy J Tschaplinski, Barney J Venables and 2 more

Open access · goldAbstract read
In one paragraph

Article in Nature communications, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 131 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
131citing papers in PubMed, 1 pooled it
11.7field-weighted citation impact, top 1% 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

131 citing papers in PubMed, 1 synthesis or guideline pooled it, 278 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. Article
  6. Review
  7. Article
  8. Functional characterization of a novelApplied and environmental microbiology · 2026
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  11. Article
  12. Review
  13. Article
  14. Review
  15. Potential of Orally Administered Quercetin, Hesperidin, andInternational journal of molecular sciences · 2025
    Review
  16. Article
  17. Plants (Basel, Switzerland) · 2025
    Article
  18. Factors underlying a latitudinal gradient in the S/G lignin monomer ratio in natural poplar variants.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  19. Article
  20. Review

71 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

12 authors at 2 institutions in 1 country.

Jaime BarrosBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.ORCID http://orcid.org/0000-0002-9545-312X
Luis Escamilla-TrevinoBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Luhua SongBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Xiaolan RaoBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Juan Carlos Serrani-YarceBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Maite Docampo PalaciosBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.ORCID http://orcid.org/0000-0001-5205-3989
Nancy EngleCenter for Bioenergy Innovation (CBI), Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.ORCID http://orcid.org/0000-0003-0290-7987
Feroza K ChoudhuryBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Timothy J TschaplinskiCenter for Bioenergy Innovation (CBI), Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.ORCID http://orcid.org/0000-0002-9540-6622
Barney J VenablesDepartment of Biological Sciences, University of North Texas, Denton, TX, 76203, USA.
Ron MittlerBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States.
Richard A DixonBioDiscovery Institute, University of North Texas, Denton, TX, 76203, United States. Richard.Dixon@unt.edu.ORCID http://orcid.org/0000-0001-8393-9408
University of North Texas · USOak Ridge National Laboratory · US

Funding

US Department of Energy DE-AC05–00OR22725
6 · The paper itself

Abstract

Lignin biosynthesis is evolutionarily conserved among higher plants and features a critical 3-hydroxylation reaction involving phenolic esters. However, increasing evidence questions the involvement of a single pathway to lignin formation in vascular plants. Here we describe an enzyme catalyzing the direct 3-hydroxylation of 4-coumarate to caffeate in lignin biosynthesis as a bifunctional peroxidase that oxidizes both ascorbate and 4-coumarate at comparable rates. A combination of biochemical and genetic evidence in the model plants Brachypodium distachyon and Arabidopsis thaliana supports a role for this coumarate 3-hydroxylase (C3H) in the early steps of lignin biosynthesis. The subsequent efficient O-methylation of caffeate to ferulate in grasses is substantiated by in vivo biochemical assays. Our results identify C3H as the only non-membrane bound hydroxylase in the lignin pathway and revise the currently accepted models of lignin biosynthesis, suggesting new gene targets to improve forage and bioenergy crops.

Indexed as

ArabidopsisAscorbate PeroxidasesBrachypodiumCaffeic AcidsCoumaric AcidsCytosolLigninMixed Function OxygenasesPlant ProteinsAscorbate Peroxidasescaffeic acidCaffeic AcidsCoumaric AcidsLigninMixed Function OxygenasesPlant Proteins

Identifiers

PMID31040279
PMCPMC6491607
OpenAlexW2942587370

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.