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

Journal Article · · Nature Communications

Lignin biosynthesis is evolutionarily conserved among higher plants and features a critical 3-hydroxylation reaction involving phenolic esters. Yet, increasing evidence questions the involvement of a single pathway to lignin formation in vascular plants. In this work 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1545188
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 118 works
Citation information provided by
Web of Science

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Lignin biosynthesis: old roads revisited and new roads explored journal December 2019
PdWND3A, a wood-associated NAC domain-containing protein, affects lignin biosynthesis and composition in Populus journal November 2019
Biotechnological Potential of LSD1, EDS1, and PAD4 in the Improvement of Crops and Industrial Plants journal August 2019
Compensatory Guaiacyl Lignin Biosynthesis at the Expense of Syringyl Lignin in 4CL1 -Knockout Poplar journal March 2020
Genomic resources for energy cane breeding in the post genomics era journal January 2019